Translated version of 20062910452516470.doc

Question two optical communication Ji Wuyuan Unit: Name: Score: First, the multiple-choice questions: (2 points each blank, 30 points) 1 When SL1 board reported R-LOS alarm, flashing red case ___B___________

A, Always B, flashes 3 times every second C, flash D, is off

2, PP ring, complete recovery type switching branch board has ___AB_____________ A, PL1 B, PD1 C, PL3 D, PL4

3, in the following veneer board with HPT function block has _____C_____________ A, PL1 B, PL4 C, SL1 D, GTC

4, SL1 board transmit optical power is 1mw, the optical power __A______________ A, 0dbm B, 1dbm C, 2dbm D, 3dbm

5, Sl4 board reported HP-SLM alarms, instructions may be ____C_ ___ byte configuration error.

A, S1 B, J1 C, C2 D, J0

6, NES requires the display resolution of at least __D______________ A, it does not matter B, 600 * 480 C, 800 * 600 D, 1024 * 768

7, under normal circumstances, MUTE switch and TEST switch should be set aside in __C____________ position respectively.

A, ON ON B, OFF OFF C, ON OF FD, OFF ON

8, T1, E1, T3, E3, E4, 155M power port pattern are C . A, B8ZS, AMI, HDB3, HDB3, 5B6B, CMI; B, HDB3, HDB3, B3ZS, HDB3, CMI, HDB3; C, B8ZS, HDB3, B3ZS, HDB3, CMI, CMI; D, AMI, HDB3, B8ZS, AMI, HDB3, CMI.

9, the following operations on 2M loaded / unloaded description is correct D . A, the channel is set to "not loaded", the alarm can not be reported, the

performance data may still find; B, the channel is set to "not loaded", the operations are always fails; C, the channel is set to "not loaded", the alarm and performance can not be

queried, but will not affect the business; D, the channel is set to "not loaded", the fiber cut, etc. In the case of business

appear unreasonable.

10, G.803 G.812 requirements both from G.813 clock does not exceed the number of clocks between C Months, G.813 clock does not exceed the total number of E Months, G.812 longest transmission link from the clock does not exceed A Months.

A, 10; B, 16; C, 20; D, 40; E, 60; F, 80

11, network protection settings for specific norms, the following errors have B . A, only centralized business STM-1 ring only recommend the use of a one-way channel protection; B, the ring of the STM-1 link with the recommended way multiplex section; C, For more on the STM-4 rings or ring with chain ring recommend using bidirectional multiplex section protection; D, recommended for grid network SNCP protection. D, a network element composed veneer MSP ring must be dual board position, such as 10G MADM of LIU1/LIU2.

12, the following test 2.5G receiver sensitivity rate, bit error sensitivity of the minimum point is smaller than the D .

A, 1E-3; B, 1E-5; C, 1E-8; D, 1E-10 13, the following description of the loop, the error is D .

A, outer loop refers to the way back after the external signal into the circuit board, the input signal loopback point will be sent back; loopback is the signal from the crossing point to return back in the ring ring cross board direction back way. B, use the command 8E first VC4 circuit boards do loopback influential danger of

ECC; C, formerly known as the outer ring back to the local loopback, remote loopback

loopback formerly known; D, do with ptp on board loopback, after a single NMS panel icons can be

displayed. 14, 155/622H device can be erased by dialing the host and resolve a reset, the following

description is correct D . A, 2.14 or higher BIOS version supports forced to erase SCC board host program; B, the method is highly NE ID of eight has dialed into: full 0, the power; whole one, the power; 1, the power; C, method is to lower the 8 NE ID has dialed into: all zeros, the power; whole one, the power; 1, the power; D, method is to lower the 8 NE ID has dialed into: full one, the power; all zeros, the power; 1, the power;

15, the clock on board the following description of the error is B . After A, clock board into hold mode, requiring the clock to keep time is 24 hours; B, ITU-T recommendations, SDH free oscillation clock required accuracy better

than ± 4.6ppm, are G.812 clock. After C, the sync signal transmission network element 20 on the network must

use Bits Debounced; D, SS11STG support S1 byte, but does not support the S1 byte of information

extracted from an external clock source for the SSM function. 16, the following description of the SDH optical amplifier board is correct B .

A, PA board is fixed power output, BA plate is fixed gain output; B, BA plate is fixed power output, PA board is fixed gain output; C, BA plate for receiving the signal sent to the end of, PA board sent to the receiving station signal light board;

D, PA plate light transmitting plate is required, long-distance light panels are satisfied.

17, SDH equipment clock if passed by 2M channel, with minimal impact on the timing performance is B .

A, the mapping process; B, de-mapping process; C, TU pointer adjustments; D, AU pointer adjustments.

18, the optical signal transmission distance limit conditions, the following statement is wrong D .

A, laser hair module sends power; B, laser receiver sensitivity receiving module; C, the dispersion tolerance of the light emitting module; D, received optical modules dispersion tolerance.

19, on the method of making the wrong network cable is C . A, standard network cable to RJ45 crystal head pin correspondence; B , Straight-through cable for the RJ45 crystal head 1, 3 and 2, 6-pin cross correspondence; C, RJ45 crystal head 1, 3 and 2, respectively, using a pair of 6-pin twisted; D, network cable and a PC workstation using the network cable using the same production requirements.

20, OptiX BWS 320G system board is used for spectral analysis D .

A, SC2; B, SCC; C, SCA; D, MS2

21 The following is a 16 × 2.5G optical supervisory channel system (OSC) a description of the error is D .

A, using as a working wavelength 1510nm

B, at the end of each site and regeneration

C, the physical interface is a 2 Mbit / s, but with CMI code, so the actual line rate is 4Mbit / s

D, if the network is a chain, then the main channel off, part of the network elements will not be monitored

22, on the DWDM system amplifier, cable release, pre-release description is correct D .

A, mainly to cover co-wave amplifier unit insertion loss, improved optical power into the fiber;

B, main power line put on the line to make up for the loss;

C, pre-amp main role is to improve the system receiver sensitivity;

D, above all for

23, for specific guidelines for network protection settings, the following errors have B .

A, only centralized business STM-1 ring only recommend the use of a one-way channel protection; B, the ring of the STM-1 link with the recommended way multiplex section; C, For more on the STM-4 rings or ring with chain ring recommend using bidirectional multiplex section protection;

D, recommended for grid network SNCP protection. 24, SSM value for the ITU-T specification C When the local office from the clock.

A, 0010; B, 0100; C, 1000; D, 1011 25, following on PDH, SDH's argument, right there: D .

A, 45Mbit / s belonging to the European standard series of radio and television programs transmitted using this interface to the Ministry; B, PDH interface specifications unified, easy to realize the interconnection of equipment from different manufacturers; C, SDH bandwidth efficiency is higher than PDH; D, SDH optical signal pattern is scrambled NRZ code.

26, the following PD1 board alarms, alarms generated before the solution is mapped A . A, TU-AIS; B, LP-TIM; C, LP-RDI; D, T-LOTC;

27, the following description about the light board 2.5G, the error is C . A, 2.5G short light board, GB optical power required to send in -5 ~ 0dBm, the

overload point of 0dBm; B, 2.5G long distance light board, GB asked to send optical power -3 ~ + 2dBm,

overload point-9dBm; C, short-range and long-range light board emission wavelength of the light board is not the same, if the mix will cause the received wavelength received does not match the operating wavelength of the optical module, so even very close to it can not be mixed; D, due to the long distance light board received APD optical module using a pipe, if the received optical power at the overload point above the light will affect the APD tube life.

28, a single system hardware REG, west RSP bad power supply module, the following description is correct D .

A, only REG West can not log in to the network element of the REG; B, only REG trending NE can not log in to the REG; C, due to the L16 plate normal, not shadow the adjacent NE Login REG; D, all other network elements can not log REG.

29, a description of the F2 population is incorrect D . A, F2 port has been configured optical port, in the case of RLOS the F2 population will affect the whole ring; B, by default, 155/622 devices using the F2 population D12 after the first two bytes; Under C, default, and 155/622 F2 to open the docking port equipment, wiring port 155/622H should use a port RS232 3, 2500 + should use the SERIAL 3; D, when using F2 port for multipoint communication protocol for application

software from the site of the setting is not required. 30, the clock on board the following description of the error is B .

After A, clock board into hold mode, requiring the clock to keep time is 24 hours; B, ITU-T recommendations, SDH free oscillation clock required accuracy better

than ± 4.6ppm, are G.812 clock. After C, the sync signal transmission network element 20 on the network must

use Bits Debounced; D, SS11STG support S1 byte, but does not support the S1 byte of information

extracted from an external clock source for the SSM function. 31, for switching conditions described multiplex section is correct D .

A, RLOS, RLOF, OOF, MSAIS a multiplex section switching conditions; B, B2OVER error threshold is 10 -6, B2SD error threshold is 10-3; C, B1OVER, B2OVER, B2SD are multiplexed segment switching conditions; D, the current host software SD switching is disabled by default, and quality

checks start to open when needed. 32, No. 39 slot in the first few VC4 TUG3, the first of several TUG2, the first of several

TU12. B .

A, 2, 6, 3 B, 3, 6, 2 C, 2, 5, 3 D, 3, 5, 3

33, about 2500 + cross saying is correct C . A, 2500 + all business interface board, the motherboard accounted for 128 sets of data bus; B, and 155/622 as standard subrack, 2500 + XCS bus master and slave boards are independent of each other; C, 2500 + low cross was TST structure, TST cross-matrix consists of four hours of cross-piece cross-chip capacity of 16 × 16 and 32 × 32 piece of empty chip composed of a cross; D, 2500 + support SL4, S16 and other circuit boards to achieve low cross 32 × 32's.

34, the following device on the 2500 + 485, the error is D . A, 2500 + 485 communication needs of TPS switching and host tie; B, if a board of 485 anomalies, 485 may affect other boards; C, 485 communication is not normal, it will affect the SNCP protection switching; D, XCS switchover by 485.

35, the following description GTC plate, the error is A . A, for non-38M crystal GTC, clock board is not in position, after configuring issued, GTC can normally start; B, SS11GTC version 1.1, does not support the separation of bicyclic multiplex section; C, clock board provides the clock to slip through the GTC board, circuit boards; D, for the expansion of the sub-frame can be used for master GTC frame for the master frame can not be used to extend the shelf GTC.

36, the following description of the 2500 + light board is correct A . A, in the actual optical power received, S 16 detects if the received optical power is too low, it will produce RLOS;

B, 2500 + S16 and only put light board provides optical power detection function; C, different types of S16, the corresponding parameter table as a laser; D, as long as the actual site of the received optical power in the normal range, the end of S16 no problem.

37, the following description of the board software upgrade, the right is D . A, NE and board input ID is 10 hex; B, NE and enter the ID board are hexadecimal;

C, NE entered ID is 10 hexadecimal, enter the ID board is hex;

D, NE ID is entered in hexadecimal, enter the ID board is 10 hex; 38, the following description of the IP / ID, the error is A .

A, IP address 132.37.0.16, subnet mask of 255.255.255.240 is legitimate; B, after manually set the IP address, change the ID will no longer affect the IP address; C, only the GNE only need to set the IP address, is prohibited for non-IP gateway network element settings; D, after 155/622H change ID, due to the database, it may result in a reset occurs frequently.

39, 2500 + Enhanced sub-frame connection terminal network is connected to the serial port B .

A, F & f; B, OAM; C, SERI AL 1; D, RS232

40, the test on the protection switching time, the description of the error is B . A, MP1550A / B test instrument no protection switching time; B, total cumulative error with the instrument when divided by the signal switching rate, switching time can be measured channel ring; C, by the test chain C2 byte, you can test the multiplex switching time period; D, pulling fiber test multiplexing segment switching time, switching the switch to open the error can be reduced switching time.

41, the event network abnormal events are not recorded in the database A . A, the board is not in place; B, user, login exit event; C, slip, clock, cross-board switching events; D, the laser is automatically switched off.

42, in an RMS system is being used, to be on a network element data set, the following optional steps:

(1) Delete fiber connection; (2) delete the link; (3) re-upload the NE data;

(4) Reconstruction link; (5) connected to the fiber rebuild .

To properly complete the data set, the following steps are correctly aligned B :

A, (3);

B, (1) (3) (5);

C, (2) (3) (4);

D, (1) (2) (3) (4) (5)

43, for the following reasons, the reasons of which do not result in system crashes RMS C .

A, workstation hardware failure;

B, RMS system data too;

C, GNE reset;

D, do not install the operating system patches

45, the following statement about the remote maintenance, the error is D . A, General Bureau network computer's IP address is 192.168.55.1; B, PC machine as a workstation client, you need to dial the network is set to "terminal window after dialing"; Cable C, workstations and Mode m 25-pin connector for correspondence; D, PC machine side, the dial-up network server as a workstation client type is set to "SLIP: UNIX connection."

46, DWDM systems in a single wave power can not be greater than 5dBm, the main consideration is D .

A, maintenance personnel safety of life; B, laser life; C, protection of fiber optic cable; D, non-linear effects

47, the following is a description of 32 × 10G system error is C .

A, 32 via the channel frequency interval of 100GHz, The maximum deviation of the center frequency ± 10GHz; B, co-channel optical power level is not greater than + 20dBm; C, You can use the G.652 fiber dispersion compensation module, not on G.655 fiber dispersion compensation module; D, using in-band or band FEC FEC or without FEC, for MPI-R point OSNR requirements are not the same.

48, with the power meter test Sn point (OTU output point) optical power, is displayed on the LCD screen "0.5mW", engineers, press "dBm" button to display the result is A .

A,-3.01dBm ; B,-6.99dBm; C,-0.5dBm; D, 0.5dBm 49, the error is described below D .

A, OTU will produce noise; B, TWC can be used instead of RWC; MON port C, D 32 is the spectral use, instead of using a wave; D, can be reported SC1/SC2 the received optical power on the NMS.

50, TWC / RWC have two kinds of PIN and APD optical receiver module type, the receiver sensitivity are B .

A, -28dBm/-18dBm; B, -18dBm/-28dBm; C, -9dBm/-18dBm; D, -18dBm/-9dBm

51, a 32 × 2.5G system, λ 1 in an OTM site WPA input optical power of-25dBm, the optical signal to noise ratio of the output signal is 22.4dB, engineers adjust the adjustable light fades slightly increase the input optical power, to - 24.5dBm input WPA, WPA then λ 1 in the output light signal to noise ratio will A .

A, becomes high; B, becomes low; C, unchanged; D, can not be determined

52, the description of OLP veneer, the error is B . A, can achieve our DWDM optical multiplex section protection system B, can achieve our DWDM optical channel protection system C, the receiving end of the channel between the optical power difference is more than 3dB an alarm; greater than 5dB, the switchover will occur. D, you can choose to restore or not to restore the two kinds of style recovery mode

53, the description of OTU's OptiX BWS WDM system, the error is C . A, TWC / RWC B1 byte can be detected, but the "read-only does not write"; B, 10G OTU using the band FEC, can achieve the same span 2.5G and 10G of networking; C, the number of reported ≥ B1 originator TWC received the business end of a few B1 RWC reported; D, RWC role in the system main reproduction signal is considered, rather than the wavelength conversion

54, the output spectra of the OTU in the MS9710B test mode is to be selected B . A, WDM_TEST; B, DFB_TEST; C, OP-AMP_TEST; D, above all for

55, a 32 × 2.5G works for a chain network, the originator OTU use TWC, closed end OTU use RWC, then test points MPI-R optical signal to noise ratio λ 1, the result is as 17dB, RWC has a small amount of error generated. After LWC replaced with TWC and RWC, λ 1 this wave of business is no longer reporting errors. Right is set forth below B :

A, LWC the FEC, so MPI-R point λ OSNR 1 increases, the error disappeared; B, λ OSNR 1 is not increased, but the FEC LWC reduced OSNR requirement for the system, the error disappears; C, LWC's FEC increased OSNR MPI-R point, reducing the system OSNR requirements, error disappears; D, AC description is wrong, the root cause of the error disappeared LWC receiver sensitivity is higher than the RWC;

56, a 16 × 2.5G works for a chain-type network (A - B - C - D - E), Site A, E is the OTM, Site B, C, D is the OLA site. Where "D -> E" This is serious aging fiber, attenuation is very large, so even though each site before the site D optical power are normal, but the WPA receives a single wave power station is still significantly lower E (-35dBm ), while WPA receiving total optical power <- 34dBm, it will shut off the output, all business interruption. Works on the 10 waves of business, but only opened an initial wave of business, the following description is correct: C .

A, unless D - E sites between an additional site, there is no way to solve the problem; B, in both OTM sites (sites A, E) selected insertion loss of the multiplexer / demultiplexer can solve the problem; C, as long as the point MPI-R optical signal to noise ratio to meet the requirements, will be sent on the business side is not mandatory luminous OTU can; D, all the receiving end OTU E sites are selected high-sensitivity receiver module can solve the problem

57, the results of OTU wavelength shift of the channel will reduce the optical power and adjacent channel crosstalk, so that each wave SNR degradation or interruption of business error occurs, the following description of the cause of the wavelength drift, the correct description is B .

A, OTU access signals (such as SDH) first wavelength drift B, laser heat sink poor contact, laser operating temperature is too high C, multiplexer / demultiplexer insertion loss is too D, EDFA gain is not flat, and after the multi-stage amplifier gain wavelength shift leads to the accumulation of uneven

58, a project for the 5 × 33dBm DWDM networking, network diagram is shown below in a single direction. System on the 10 waves of business. Q: If a section AB, BC, CD these three segments of optical fiber system running for some time, attenuation becomes larger (final attenuation increases 2dB).

Will the attenuation increases in that period, the greatest impact on system performance? A

A, A - B; B, B - C; C, C - D; D, the same impact 59, most of the OptiX BWS DWDM system board, with optical power detection function, the following piece of veneer, if the power detection part of the circuit is damaged, it will interrupt business. A

A, WBA; B, D32; C, TWC ; D, SCA

60, 2500 +, 155/622H mixture of PP ring, centralized operations, # 1 is 2500 + central station, as shown below. When the # 1, # 2 fiber cut between normal switching,

the following statement is correct B

A, # 1 branch board has PS alarm; B, # 2 slip board has TU-AIS alarm; C, # 3 branch board has TU-AIS alarm; D, # 4 board does not slip PS alarm;

61, about 2M mouth combined jitter test, the following statement is wrong D A, there is an optional pointer to the sequence A, B, C, D four kinds; B, test devices using light received electric hair way to test; C, asked to join the 2M 155M offset in the payload, but can not add offset the 155M optical port; D, requires instrumentation tracking device clock to keep pace;

62, about 2500 + bus structure argument is correct A A, OptiX 2500 + all business interface board, the motherboard accounted for 96 sets of data bus; B, VC4 level business achieve high-level cross-matrix 2500 + cross, the total capacity of the cross 96 × 96; C, after re-framing the slip payload processing chip (TUPP) path format applies only to float the business; D, channel protection ring with dual selective receiving characteristics, thus supporting operations in low-level cross the road in the same matrix occupies two VC4.

63, 2500 + overhead bus speed of C A, 19.2K B, 64K C, 2M D, 38M

64, No. 1 Mouwang element ID, extension ID number is 6, then the decimal ID for C A, 060001 B, 010006 C, 393217 D, 589827

65, 2500 + devices, the following configuration is needed to avoid B A, IU1, IU2 composition using SL4 622M unidirectional path protection ring; B, IU2 use SQ1 1, 3 two-way optical multiplex section protection ring constitute mouth; C, IU4 the S16 and the S16 composition 2.5G IU9 unidirectional path protection ring; D, IU5 the SD4 SD4 glazing and glazing mouth mouth IU6 composition 622M bidirectional multiplex section protection ring;

66, for the 2500 + XCS clock module, the following statement is correct D A, mode external clock signal is 2Mbit / s or 2MHz, can be done through network management software settings;

#1

#2

#3

#4

155/622H 155/622 155/622H

PP» ·

W E

B, external clock interface supports both 75-ohm and 120 ohm input and output impedance; C, and 155/622, like 2500 + provides two-way and four-way clock input clock output port; D, a clock alarm panel appears SYN-BAD, and site or upstream station clock deterioration related;

67, 2500 + devices on ECC management, the following statement is wrong C A, ECC can assign up to 20 channels; B, ECC port number does not correspond to the slot; C, but the incumbent has started light board, control board does not automatically assign ECC channel number; D, when the channel number assigned by the corresponding optical / electrical interfaces occupy fixed regardless of whether the board is subsequently pulled out the light;

68, for the 2500 + TPS board, the following statement is correct B A, TPS protection switching needs EIPC, XCS, SCC and the corresponding protective panels to participate; B, EIPC submitted data inconsistencies when the alarm DATA_DIFFER, TPS does not affect the normal protection switching; C, when the electric signal to a plate 2M/34M/45M protection plate board bit corresponding interface board used as FB1; D, TPS after switchover, plug EIPC will not have an impact on the business;

69, 155/622H equipment chain network, when two-way-through the middle of a business site is deleted, the two sites of the business will be reported to the appropriate channel tributary board which of the following warning A / B

A, TU-LOP B, TU-AIS C, LP-UNEQ D, LP-RDI

70, after a master reset, which before the reset can be queried to get the information generated from the host C

A, multiplex section switchover event B, historical alarm C, MSP unusual event D, historical performance

71, DWDM system, select an optical frequency reference can provide high frequency accuracy and stability of the optical signal, the current reference frequency wave subsystems B .

A, 192.1THz B, 193.1THz C, 193.6THz D, 195.1THz

72, the following error is on the dispersion compensation B . A, TWF board without dispersion compensation on G.652 fiber transmission distance of 30Km, 30Km necessary to add more than dispersion compensation module; B, G.653 fiber can be used in a 32 × 2.5G wave subsystems; C, the dispersion compensation is required to compensate the system the amount of any residual dispersion wavelength dispersion tolerance of not more than the light source; D, is defined wavelength dispersion coefficient of 1nm apart 1km two optical signals transmitted from the delay difference, the unit is ps / nm.km;

73, use on the instrument, the following statement is wrong A . A, OTDR can measure the attenuation of signals of different wavelengths on the line, the tight end of the pigtail bundle can also cause excessive attenuation measurements out;

B, when the table with OTDR measurement lines, fiber and equipment necessary to disconnect the receiving end; C, HP37718A instrument can measure optical power; D, precision multi-wavelength optical spectrum analyzer meter better than the wavelength of the test the best use of multi-wavelength light meter.

74, with the MS9710C DFB laser measuring TWC test pattern output spectra below

If you do not consider the error of the measurement instrument, the following statement is correct B .

A, the center wavelength of TWC 1551.14nm; B, TWC's side mode suppression ratio of 35.7dB; C, TWC 20dB spectral width of the output signal of 0.52nm; D, TWC output optical power-15.88dBm.

75, a wave of projects using OLP board provides 1 +1 protection fiber optic lines, in which the position of OLP station A (OTM) and Station B (OTM) between the following figure, the dotted line for the device, the receiving end are used within a single

station WPA04 + WBA04,

Main cable with fiber optic cable using soil burial, are bi-directional line attenuation 20dB; spare cable using aerial cables, two-way line attenuation is 25dB, known 1 × 2 switch insertion loss of 1.5dB, the following is a description of the error B .

A, the main use of two fiber optic cable have access 5dB fixed attenuator to balance the active and standby fiber attenuation;

3dBñ î º Ï Æ÷ 1¡ Á 2¹ â ¿ ª ¹ Ø

1¡ Á 2¹ â ¿ª ¹ Ø

OLP OLPÏ ß Â· ¹ â À SCASCA

3dBñ î º Ï Æ÷

Õ¾A Õ¾B

1B, in this case, the system can work without any alarm; Adjustable light fades before WPA C, stations A and B are the receiving end must be removed; D, switchover time is greater than 50ms, while producing PS alarm.

76, all of a sudden the receiving end OTU have reported the error, the following analysis of the cause of the malfunction is wrong D .

A, deterioration of optical power lines, resulting in the optical amplifier board causes low input optical power; B, may be put in the middle plate pump laser light failure cause; C, may be put adjustable plate light before bad light attenuation changes lead; D, may be the originator coupled combiner module insertion loss increases lead.

77, the wave of error test is described in error D . A, wavelength division error test requires 24 hours of zero error; B, wavelength-division-level error test can even be tested, but not more than 16 series; C, OTU detected only on the B1 does not deal with; D, at 32 × 10G system, each point of light power and SNR are transferred to normal, 24-hour test without error, you can be sure that the system is stable.

78, the following are some of the features described in the wave of veneer, the error is B .

A, LWC veneer client uses transceiver module, TI mouth of the input optical power can not be reported; B, PMU S4 single-board DIP switch is OFF is the second reversal and erupted shelf communications; C, if the actual channel is not configured to run in MS2 board, the board will be reported CHAN_ADD MS2 alarm; D, SC2 board when entering matt RLOS alarm may not be reported, but the newspaper ROOF and OSC-RDI.

79, WDM equipment maintenance in some of the considerations, the right is D . A, when coupled to the WDM multiplexer expansion, just the power of the OTU output wavelength stabilization 1-2 seconds, and adjacent channel business will be affected, can not avoid this phenomenon; B, pigtail bend radius should not be less than 20mm; C, can be used to clean the fiber head high concentrations of alcohol; D, the current wave of adjustable devices are shipped lumen OZ bad light, light attenuation increases clockwise, counterclockwise light attenuation decreases.

80, the fuse rated current value is calculated as follows: In = , The formula P is the device power consumption Vmin is the minimum equipment configuration normal operating voltage range, Percent of rating derating factor in different ambient temperature, ambient temperature is 50 ℃, the coefficient is equal to 0.9. So a 2500 + II cabinet rack with full allotment should be chosen C Insurance fuse.

A, 10A; B, 20A; C, 25A; D, 30A.

81, OptiX equipment requirements for short-term work humidity range between 5% and 95%, short-term refers to the continuous work does not exceed C Hours, annual total working time does not exceed E Days.

A, 24; B, 48; C, 72; D, 10; E, 15; F, 30. 82, 2M cable description refers to the parameters of the cable 75-2-1 B

A, characteristic impedance, the outer diameter of the entire dielectric core values, the inner diameter of the core wire;

B, the characteristic impedance, the outer diameter of the entire dielectric core values, shielding stratum; C, the characteristic impedance of the shield layers, the outer diameter of the dielectric core integer; D, the characteristic impedance, shielding layers, the inner diameter of the core wire.

83, 2M extension cable model 155/622H PD2 board used is B A, SFYZ 75-2-1; B, SFYV 75-2-1; C, SYV-75-2-1; D, SYV-75-2-2.

84, the following SDH optical put on board to say, the error is D . A, power amplifier module with a fixed output, BA2 boards generally have 14dB and 17dB two specifications. B, fixed-gain preamp mode preamplifier and power amplifier supporting the use of the general. C, pre-amplification module light source wavelength sensitive, so only and fixed with the use of some type of light board. D, preamplifier module for improved light receiving optical power, if the receiving end of the optical power in the normal operating range of the light board, you can not use.

85, 2500 + devices on ECC function description of the error is A . A, SS61SCC supports up to 48 channels ECC. B, 2500 + devices each slot can be assigned up to four ECC, such as SQ1 veneer four optical ports can provide ECC functionality. C, 2500 + devices ECC is the host software automatically assigned, some light can be turned on or off the mouth of the ECC functionality through an external command. D, 2500 + Extended ECC function provides automatic and manual extended ECC function.

86, 2500 + equipment conditions determine the dual board position relationship is D .

A, data bus B, 485 bus C, E-mail D, overhead bus 87, the following high-level overhead feedthrough on the end of the description and the error is C .

A, 2500 + devices can automatically configure the overhead light panels and termination mode feedthrough according to business configuration. B, the cost of equipment under 155/622/2500 default is the end of all the light board. C, in the case of overhead feedthrough, VC4 business where the channel appears HP-TIM, B3SD and other alarm is normal. D, for low-level operations, configured for overhead Through mode may cause business interruption.

88, OptiX series devices, the use of equipment through regular D . A, 155/622 extended shelf B, 2500 + C, 155/622H D, REG

89, the following commonly used on the SDH network protection argument is wrong A, D .

A, 155/622 twin-channel protection ring feature is implemented in the branch board, selection function is implemented in a cross board. B, a logical system for SNCP configuration attributes, and its implementation to protect the business from top to bottom in the PDH tributary channel protection ring the same way, so you must configure the branch channel protection properties.

C, bidirectional multiplex section protection switching and business is irrelevant, the protection channel is shared, bidirectional multiplex capacity segment is generally higher than the path protection ring. A four-fiber bidirectional D, 2500 + equipment consisting of section protection ring than two two-fiber bidirectional multiplex section protection ring capacity is high.

90, the following statement regarding pointer adjustments, the right is A, B, C, D . A, 2M signal adapted to the synthesis of STM-1 VC12 until the whole process does not produce TU pointer adjustments; B, slip plate detected TU pointer adjustments are transformed over AU pointer adjustment; C, 2500 + device light board reported AU AU pointer to pointer adjustment because the upstream network element sending signals changed; D, in the case of the clock is not synchronized, VC12 services, point to point networking AU pointer adjustments are not reported.

Second, fill in the blank (empty 0.5 points per 35 minutes) 1, STM - N regenerator section DCC frame transmission rate of __ 192kbits / s; multiplex transmission

rate for the section DCC __ 576kbits/s_. 2, if the device only through official telephone with E2, the regenerator _ not _ (election can or can

not) through the public telephone. The reason is _ E2 as MSP official bytes _. 3, for the regeneration section error monitoring, BIP - 8 bits are all previous STM-N frame after

scrambling for the calculation, the result is placed _ B1 byte before scrambling. For multiplex section error monitoring, BIP - 24 is _ the previous STM-N regenerator section overhead in addition to all the bits were outside the calculated result is placed in the position _ B2 scrambling before ________. For STM - N system, B1 can monitor a maximum of _________8__ Errored blocks; B2 ________24___ can monitor a maximum of errored blocks.

4, the device can be judged according to S1 byte _ information _ the clock quality. 5, J1 is _ Higher order path trace byte is used to ensure the continuity of the receiving end of the

tunnel and sending end of the channel. 6, C2 for the higher-order path signal label byte for the multiplexing structure and payload VC

frame. 7, H4 as TU - multiframe indicator byte 1 and 2, indicating that the frame type and the payload

multiplexed payload position. 8, No. 37 in the slot position in VC4 for the first ___1_ a TUG3, first ___6__ a TUG2, Section __ 2__ a TU12. 9, for the pointer adjustment AU, AU-PTR is Negative Adjust the position, AU payload of information

Positive Adjust the position. __3_ Bytes as an adjustment units. TU - 12 pointer adjustment unit is __ 1__ bytes.

10 multiplex section protection ring maximum number of nodes per Internet __16_______. 11, SDH optical line code type is __NRZ__________________. 12, in the master-slave synchronous digital network, the slave clock usually has three operating

modes: _ tracking mode, hold mode _ freedom concussion . 13, height OPTIX155/622 standard ETSI cabinets have _2 ____ m, __ 2.2___m, _2.6____m. 14, OPTIX2500 + crossover system capacity is 128X128 VC4, where higher-order cross-connect

matrix capacity is 96 , Low-level cross-ability 32 . 15, Mouwang element ID is 18, then the control board D7-D0 bit corresponding DIP switch should

be represented by a binary __ 00010010 ___________________. 16, the cabinet power distribution panel on the left has four alarm distribution columns, ___ __ blue

color cable connected to-48V, the color _ black ____ cable connected to GND, the ____ colors _ yellow cable connected to PGND on; Roof on the right there are three indicators: __ ___ green light indicates-48V power supply is switched on, _ yellow light indicates ____ major alarm, red _____ represents a critical alarm.

17, a bureau of the newly opened OPTIX equipment, the Bureau designed A-to B station opened 50 2M, 2M required interfaces A station is 75 ohms, 2M interface B station is 120 ohms, can achieve __ energy ____________ (energy / not).

18, SBS grounded by equalizing, and other potential design principle, namely, grounding, protective earth (including shield grounding and lightning protection and grounding MDF) share a common set of joint grounding ________ way grounding; grounding resistor requirements < ___1___ Ohm .

19, straight-through cable Ethernet port, and its connection are: 1, 3, and 2, 6 are cross- .

20, (choose from the available options in the back) using remote access proxy methods for remote maintenance, you can by a ______AB________ (A, a client; B, remote maintenance end) initiates dialing, caller needs: ___ ABCD____________ (A , install Dial-Up Networking; B, TCPIP protocol; C, properly set up a connection; D, and initiate dialing; E, install all ;) 95PLUS's. The called party should: _ABCD_________ (A, install the dial-up network servers; B, TCPIP protocol; C, and allows remote dial-up access; D, run the RAS; E, modify TCP / IP address)

21, if the switch is powered down, the corresponding branch board OPTIX equipment generates __T-ALOS____ alarm; If the fiber break, the corresponding light panels will produce _R-LOS___ alarm; If TU - AIS, indicates that the corresponding 2M business __ interrupt __, __ transmission fault source is located ______ (please fill in the exchange side or the transmission side); If a station appears MS - AIS alarm, it will send back to MS-RDI in the upstream direction, which means that the site _ complex Receive flawed by segment ; 22, single station commissioning, make the "top of rack power box between terminal resistance measurements," if resistance occurs _ (0) when there is a short description of the phenomenon of the sub-frame, we must exclude the fault before continuing on ESC test. 23, the configuration of business within the path protection ring, paragraphs 1 and 5, 2 and 6, 3 and 7, 4 and 8-bit dual board conducted bit dual board configuration rules: __ Bit dual board slot can not be repeated _____________________ .

24 , SDH signal transmission in the optical path, mainly in order to go through the scrambling signals in order to ensure 0 and 1 The ratio is close to 50% , to facilitate the extraction from the optical path Clock Information .

1 25 , a network diagram works as follows:

NE 1 Access 2 -way G.812 external clock, 2 West Road NE to trace a number of NE clock, 3 No. westward track 2 No. NE clock, 4 No. NE trending tracking a number of network elements clock, the whole network Open the S1 clock protection switching function. Under normal circumstances, the whole network, Please fill in the following table for each network element receives a clock circuit board quality ( S1 ): A , G.812 B , C SETS , unavailable.

Projec

t

NE1 NE2 NE3 NE4

East West East West East West East West SSM C C C A A A A A

26 , the interface region, Ethernet is Ethernet interfaces, phonel-3 is official interfaces, F & f can be used for network element management interface. 27 , by the multiplex section protection switching Light Plate detection alarm, the master Board running agreement, XSC board to perform an action, agreement K1 K2 bytes to transfer.

28 , 155/622H PD2 board using 2M extension cable model SFYV 75-2-1 29 , 2500 + overhead bus speed of 2M 30 , a 32 × 2.5G systems, lambda 1 in OTM site WPA input optical power of -25dBm , the optical signal to noise ratio of the output signal is 22.4dB , engineers adjust the adjustable light fades slightly increase the input optical power, to - 24.5dBm input WPA , then lambda 1 in WPA output optical signal to noise ratio will go high .

31 , DWDM system power can not be more than a single shimmering 5dBm , the main consideration is non-linear effects 32 , the event network abnormal events are not recorded in the library board is not in position . 33 , the current alarm is unacknowledged or disappear alarms, alarm history is recognized and has disappeared alarm. 34 , the test 2.5G rates below the receiver sensitivity, the sensitivity of the error minimum point is less than 1E-10 . 35 , SDH equipment if by 2M transfer clock channel, minimal impact on performance is timed to the mapping process . 36 , Opt ix2500 + clock can be used outside line, branch and internal Clock source . 37 , Optix2500 + system, S16 board inserted from the shelves 4 , 5 , 6 , 9 , 10 , 11 slots; PQ1 board in the sub-frame 1 - 4 , 11 - 14 slots. 38 , Optix2500 + system, including an interface unit, the cross section, the main control unit, the auxiliary unit. 39 , the channel definition rule is the main ring ring counterclockwise, West received Tohatsu . 40 , SQ1 of a and 3 optical port, 2 and 4 optical ports can be composed of ADM , 1 and 3 can be composed of multiplex section of ADM .

Third, failure analysis 1, a 16 × 2.5G network engineering as shown below, A, D site for OTM site, B, C for the site OLA site. A - D 16 between the full-wave service, the system uses the OTU TWC / RWC. After working for some time, λ D sites 1, λ 3, λ 9, λ 10 RWC corresponding network has continued on a small amount of error reporting, see A site corresponding TWC, no error reported. In addition, λ 13 occasionally (a few days time) reported B1 BER, and similarly, in the A site corresponding TWC also no error reported. View D sites in the network all RWC escalation optical power, are between-10dBm ~-14dBm (RWC all using PIN receiver module). A site to see all RWC, no B1 reported. Further, the entire system without any

alarm. Simply analyze the causes of this situation.

TWC without error, indicating that the error did not bring itself into SDH DWDM systems; addition, A site RWC without error, the problem is one-way; individual waves appear error, λ 13 is particularly evident, often do not appear, but sporadically reported. Problem is rather clear: D site MPI-R optical signal to noise ratio is very low point, in the vicinity of the critical point, due to the optical power is not flat, the light signal to noise ratio is also inconsistent, the sender signal quality itself is also inconsistent, so part of the channel by mistake code. The reason this happens, the vast majority because A -> D direction caused by cable attenuation increases. Need to use a spectrum analyzer to locate the problem, look at that site OSNR reduce abnormal.

2 , ( 3 points) A project for the peer network, the end of OptiX 250 0 + , and the other end to the other manufacturers SDH equipment, now consisting of user requirements 622M linear multiplex section. 1 , you will set what types of linear multiplex section, and explain why. ( 2 points) 1 +1 single-ended switching, no APS protocol.

2 , according to the networking solutions you offer, if sent with a light at each end plate fracture mouth pigtail connection. Please analyze business situations at this time, and why. ( 1 point) Business is normal.

3 (4 points) A point DWDM project consists of a two-OTM (Site A - Site B), on a two-wave business λ 1, λ 2 (Access Division I OptiX 2500 +). Now expansion, the λ 3. Engineers at site A, B pigtail connected after all. A site in the company's cutover L SDH to TWC. A site was found in the company of SDH access instantly L, λ 2 N's corresponding burst error occurs SDH equipment. Because access to the N λ 2 SDH company has not officially on business, so the user agrees again cutover λ 3, in order to reproduce the problem, locate the reason. The result: cutover λ 3 of 20 times, there have been two times cutover burst error occurs instantaneously λ 2 phenomenon. Will: A site co-wave plate is used for which type? Why does this happen? Does not change the board, by what standard operation, to avoid this problem? Coupled multiplexer. The reason for this is: OTU no input is no output, the access signal, OTU with output, current output process is applied, the current increases from 0 - Process> stable value. In this process, the wavelength is unstable, it may go to the center of the string to other wavelengths, the multiplexer coupled center wavelength is not isolated from non-functional, so that it may affect the adjacent channel, this process is very short. You can not let this problem through norms, is the OTU to the combiner pigtails, not the first access, upon OTU access SDH signal, the output signal is then OTU access to the combiner. &&& , semi-open, integrated applications, please explain the difference. WDM light used must meet the G.692 signal simplifies point, at least a predetermined wavelength of the optical signal. General SDH optical port does not meet this requirement, the need for a conversion unit. Generally, the transmission side using the converting unit, the non- G.692 signal is converted to G.692 signal receiving side to restore the signal in the form of application, the application is open. If the signal provided by the WDM optical port itself to meet the G.692 signal, then do the light conversion unit is ready for use. This time is integrated applications. Sometimes, at the sending end, the use of the conversion unit at the receiving end is not used, this time is a semi-open applications. Our W32 system, using the TWC and RWC system is an open system; TWC and RWC systems are not integrated system is used; using the TWC does not use RWC system is semi-open system . 4 , ( 4 points) A 32 × 2.5G system, SDH equipment for the Division I of the 2500 +, the receiving

end of the signal flow diagram is shown below:

BER performance data query found a certain date S16 board continuously regenerated segment reported a large number of errors, corresponding to the RWC board finding any error performance data, replace the channel RWC to S16

pigtails and flange late, S16 on error code does not disappear, it can be concluded whether the fault lies in the S16 board, and why? (4 points ) No, ( 1 point) failure may be due RWC veneer damage caused by the transmission module receiving end S16 generates the error, and failure to send the module in error performance is undetectable ( 3 points). / / OTU (including RWC ) board ships by three parts, a receiving module, a transmitting module, and a signal processing section (the PCB large panel). Changes in the optical signal receiver module into an electrical signal, gave PCB big board, PCB board first high-speed signal multiplexing solutions to large multi-channel low-speed signal is divided into two parts, one used for monitoring, including RLOS , RLOF alarms and monitoring B1 BER, etc., without any treatment other way, through multiplexer multiplexed into a high-speed signals to the transmission module, data, etc. If an error in transmission and multiplexing process RWC board can not be monitored, but the back-end the light receiving board can be detected.

5 , ( 6 points) 2 , a 32 × 2.5G works only three stations, A station and C between stations 3 wave

business networking diagram is as follows: (only draw a wave of OTU board)

One day the user informed of all business interruption, check the alarm and found A station received C all stations RWF are reporting RLOF alarms, other network elements without any warning, the query A station WPA recent performance data, found that WPA board input / output optical power no change, since all channels are business interruption, conclude that A station received C station put a piece of board failure light, no light spot to put plates prepared plate, A station with C station spare adjustable light fades, I ask how the fault Navigate to a specific optical amplifier board? ( 6 points) 1 , the A station WBA output and WPA between input dimmable failure to do loopback, the WPA input optical power is adjusted to a value before the loop, the query A station RWF whether reported RLOF warning, if it is, A station's WPA put the fault light board. ( 2 points) 2 in C station WBA output and WPA between input dimmable failure to do loopback, the WPA input optical power is adjusted to a value before the loop, the query A station RWF whether reported RLOF warning, if it is, C station WBA light put board fault. ( 2 points) 3 , the B station, swap two WBA board query A station RWF is also reported RLOF alarm if the alarm ends, the B station Fat A station WBA light board for the failure to put boards. ( 1 point) 4 , the B station, swap two WPA board query A station RWF is also reported RLOF alarm if the alarm ends, the B station received C station's WPA board for the failure to put the light board. ( 1 point)

6 , ( 5 points)

S

D

H

S

D

H

TWF

M32 WBA WPA WBA WPA D32

RWF

TWF

M32WBAWPAWBAWPAD32

RWF

A B C

A 320G WDM equipment, configuration, as shown in Figure # 1 station, the # 3 station OTM Station # 2 Station OLA equipment, M32 , D32 for the AWG type;

measurement # 1 station

B02

P03 B04

22dB 26dBB02

M32

D32 B02

D32

M32

P03

B02

B04

BD

B

G.652G.652

VOA ÊÖ¶¯¿Éµ÷Ë¥¼õÆ÷ͼÀý

££1 ££2 ££3

D 80kmÉ«É¢² ¹ ³ ¥Ä£¿é

D 20kmÉ«É¢² ¹ ³ ¥Ä£¿éB

D

and # 2 are inter-station bi-decay 22dB (including SCA insertion loss], # 2 station and # 3 sites are bidirectional attenuation 26 dB (including SCA insertion loss], 20Km of DCM module insertion loss of 2.5dB , 80Km of DCM module insertion loss is 9dB , WPA03

and WPA04 laser shutdown threshold same.

May I ask what the figure is adjustable manually and electrically adjustable light fades VOA configuration unreasonable, and why? (5 points ) Manually adjustable light fades: 1 , # 3 station WPA03 adjustable front light fades, the optical power is not enough; 2 , # 2 station WPA03 adjustable front light fades, the optical power is not enough; 3 , # 1 station receives direction WBA02 adjustable front light failure, because after a piece WPA03, but in the end received signal, there is no room for adjustment. VOA: 1 , # 2 station WBA02 front VOA irrational allocation, optical power can not be adjusted; 2 , # 2 station WBA04 front VOA configuration unreasonable, even remove the # 2 station receives WPA03 adjustable front light failure is not enough.

7, OptiX BWS 320G engineering OADM station, down two waves penetrating 6 wave,

signal flow diagram is shown below, " "symbol indicates a fixed adjustable light fades, the receiving end OTU using PIN tube, the input power range requirements of -6dBm ~ -12dBm of Rooms, all MR2 collusion loss: MR2 's IN and MO between ports, MI port and OUT ports are between 1.5dB ; losses up and down waves are 2.5dB , adjustable minimum attenuation of the light fades 2dB . (Assuming WPA pre-measured optical power can be properly adjusted and flat)

7.1 , MR2 and receiver OTU between fixed light fades generally fixed at the top of the ODF rack, start time, to minimize the number of fixed light fades, taking into account as far as possible without adjustment "when the expansion B "at the dimmable decline, MR2 's IN port should be adjusted to the total optical power 5 dBm (excluding pigtail attenuation and noise). ( 3 points)

Taking into account as far as possible without fixing the light fades, requiring up and down two wave MR2 's IN port to maximize the light power, as OTU input range - 6dBm ~ - 12dBm , so IN the mouth of the total optical power of { ( -6 + 2.5 ( next wave insertion loss)) + 10log8 = 5.5d Bm}, but the IN port has no room for adjustment, so the IN port can be up to 5dB. If the regulator "is the expansion B "at adjustable light fades, the next wave of adjustable light fades attenuation values need to be added or changed too much trouble. If the regulator D adjustable at the light fades, the changes will not be great. 7.2 , two MR2 wavelengths down if not what might cause the problem? ( 4 points) Up and down the wave is not as likely to lead to collusion wave and the wave length overlap. / / Just to know the result of the points scored. 7.3 , please write the commissioning process, " A "," B "," C "," D " 4 adjustable light fades at the order and adjust the main commissioning content. ( 4 points) The first step: first regulation A tunable light fades at the light power adjustment to WPA input optical power requirements; ( 1 point) Step two : then adjust B adjustable light fades at the meet the needs of the next wave channel optical power, try the next wave channel without fixed light fades; ( 1 point) The third step: Adjust D adjustable light fades at the wavelength of the light power adjustment collusion sending end WBA input optical power requirements; (1 point ) Step Four: Adjust C Dimmable bad place, so that the wave channel optical power at the sending end of the WBA and the penetrating power of the wavelength of the flat. ( 1 point) 7.4 , users want the expansion to up and down four waves, increased 2 blocks MR2 board, the dotted line is connected to the expansion front, see diagram below will each corresponding expansion of the optical port with a line connected. ( 4 points)

8 , ( 25 points) A project consists of 5 points 155/622 devices consisting 622M unidirectional path protection ring, using SS24SL4 light board. Central Station is 1 No. NE, 2M to centralized operations, in addition, 2 & 4 NE unprotected 155M has a business (after 1, 5 NE). 4 No. NE tracking external BITS , other network elements to track west of the station. Network diagram is shown below:

8.1, 4, 5, broken fiber optic cable between the network element, if the five numbers NE trending light board from the ring, is there a problem? If the four No. NE trending light board from the ring, is there a problem? And explain why. ( 4 points) Fiber cut after 5 No. NE trending light board from the ring, 1 NE closing number

2 , 3 , 4 , No. businesses NE switched back to the main ring will enable businesses from ring cause an interrupt. The 4 No. NE trending light board from the ring, usually no impact on the business (but do not allow self-loop).

( 155M business always fails) 8.2, known 3 No. NE some things to cable in the same cable, the cable is Waduan a day. But the Council was wrong in cable splicing Shique melt, causing 3 No. NE and 2 , 4 , No. fiber optic connection between network elements are as follows:

Please provide analysis 2 , 3 NE to No. 1 , No. NE is normal business, and explain why. ( 6 points) 2 No. NE to one business number NE is not normal. The reason is two numbers of business due to misuse network element connected to the 3 No. NE trending light board input port, the business through cross-board, light board from the west to the output port, and was sent back to the 2 No. NE. Result in business direction is from the ring.

Similarly, 1 NE after No. 3 to No. NE 2 NE number of business, but also 3 No. network element is looped back to the 1 , No. NE. 3 NE to No. 1 NE normal business number (without regard to clock factor). 8.3, even after the cable is wrong, whether from the central station network login

3 No. NE, and why? (3 points)

Fiber even after the above manner, the central station will not log the 3rd NE. Because ECC requires consistent walking route.

8.4 In the case of fiber optic cable connection is restored to normal, the known 5 No. NE STG board clock performance degradation occurs, please fill in the following table are adjusted for each network element has pointers. ( 12 points)

NE NE1 NE2 NE3 N E4 NE5 TU pointer adjustments (fill in there / No)

Have No No Have No

AU pointer adjustment (fill in there / No)

Have Have - No No

If one has a pointer to adjust the number of network elements, please list one number appeared pointer adjustment NE NE business for what. NE1 corresponding NE4 of 2M channel has TU pointer adjustments, the corresponding NE2 , NE3 of 2M channel may not be under ideal circumstances TU pointer adjustments may also be both TU pointer adjustments have positive TU pointer negative adjustment, NE5 no pointer adjustments. (When answering this question, consider the other network element clock normal track 5 No. NE, NE which has a pointer to adjust the performance of the event reported.) . ) 9 , 2500 + multiplex section protection switching time testing, service configuration, as shown below in Figure T1 are PQ1 board. At this point, if NE1 -down, in the case of multiplex section protection switching normal, alarm panel please fill in each branch to the next table. Alarm Select: A : TU-AIS ; B : LP-RDI ; C : no alarm. ( 7 points)

PD1 (T1) boards

where NE

Channel 1-8 Channels 9-16 Channels 17-24

NE2 C C C

NE3 A C NE4 C C

Description: NE4 of T1 :1-8 and NE2 of T1 's 1-8 error occurred connection, no alarm is generated. 10 , system commissioning and 24- hour BER test under normal circumstances, the engineer in order to reduce the alarm to all business channels have carried out the ring back the next day found the business through all channels in the network has AUAIS alarms, query 15 minutes Performance was found when all channels have a lot of pointer adjustments, suspected primary channel fails, the backup channel down to the business of the phenomenon persists, please explain these phenomena. ( 4 points) This is a normal phenomenon. Because there is no operational, due not only to the hardware with POH and a full payload of the outer plug, H1, H2 bytes are inserted under a resulting downstream station reported AU-AIS alarm operations result in substantial randomness pointer adjustments.

10 , ( 4 points) Please indicate LTI , SYNC_LOS Chinese meaning and distinction. LTI ( Loss of Timing input ) refers to the synchronization source is lost, the alarm is generated in addition to the case of the "internal clock" outside each of the other levels of the clock source is lost or unavailable. ( 2 points) SYNC_LOS ( Synchronous Source Level Loss ) alarm, the alarm level is the synchronization source is lost, the high level of the clock source is lost or unavailable when incurred. ( 2 points) If all high-level clock source is lost or unavailable, reported LTI alarm clock board will track NE "internal clock source" .

11 , ( 6 points)

A 2500 + channel protection ring as shown below:

# 1 , # 2 , # 3 , 4 , # 5 based ring direction, centralized operations, # 1 for the central station, # 2 , # 3 , # 4 , # 5 clocks are westward track. Inspection found: # 4 , # 5 all channels reported TU pointers are adjusted, # 1 newspaper TU pointer negative adjustments.

I ask: ( 1 ) In contrast, the # 1 clock than # 5 fast or slow clock? ( 3 points) Fast ( 3 points) ( 2 ) Please list any problems that may arise sites and veneer is? ( 3 points) # 3 East to the light board ( 1 point), # 4 West to the light board ( 1 point), # 4 clock board ( 1 point); 12 , ( 5 points)

Multimode 155M multimode fiber optical plate with singlemode 155M docking light board do? Please explain why. If you use single-mode fiber it? ( 1 ) No, because the single-mode optical module can not handle multi-mode optical; ( 3 points) ( 2 ) No, not multimode optical transmission in single-mode fiber Lane; ( 2 points)

13 , ( 10 points)

#1

#2

#3 #4

#5

E W

An engineering network as shown below, # 1 - # 4 NE 2500 + devices, # 5 - # 8 of 155/622 device, composed of 2.5G and 622M bidirectional multiplex section protection ring. Where # 8 NE # 5 NE extended sub-frame, two network elements via 622M connecting the optical path, # 8 NE is not configured STG board; # 5 and # 8 NE each use 1 block 12GTC boards are enhanced type sub-frame, the host is 16.02

. # 1 ~ # 4 NE host 4.5.2.8 , version matching veneer.

( 1 ) If you want to pay attention to what this piece of equipment panels and specify the reasons. ( 5 points)

SS62S1603 overload point -9dBm , so to add the light fades; ( 5 points) ( 2 ) put on standby boards after switching restored to normal operations, this time

related to the need to check what to do, and why. ( 5 points) Software version checking, checking whether the version matching; ( 5 points)

14 , ( 6 points) A regional backbone network using 2500 + equipment consisting multiplex section protection ring, the business includes 2M voice services, 10M/100M Ethernet and 155M ATM business. # 1 Board SCC board reset frequently need to be replaced SCC . Due to frequent changes in the Council's operations, the command line of the file and the actual serious discrepancies, so I decided to use a portable machine NES on the network load, the method to back up data to download and issued. Issued after the configuration is successful, after users complained that the site down, penetrating the 155M entire business interruption, but 2M business, 10M/100 M Ethernet normal. Please explain the reasons and propose solutions.

NES when downloading data, for 155M business default is to use the overhead termination method ( 2 points), and the device had to work on overhead penetrating way, because of the overhead has been regenerated ( 2 points), thus resulting in 155M business interruption, but 2M business is not impact; NMS is set to "no end" mode or use : cfg-set-vemode command line, PTP command processing can ( 2 points)

15 , ( 4 points) Our company uses a Route 2500 + and 2500REG networking, networking legend

below, please draw the fiber connections diagram.

(The wrong one line deduction 1 minute, buckle end up ;)

16 , ( 4 points) A 16 × 2.5G wave of projects, start bit found in 11 plate LWC board reported RLOS alarm, the 11 panels and 12-bit LWC plate interchangeable fiber board, 12-bit board without any warning, check the network 12 15 minutes performance data sheet position is as follows:

12 1 FECCOR0BIT 15m 3083 2002-4-9 15:28:57 12 1 FECCOR1BIT 15m 0 2002-4-9 15:28:57 12 1 FECCORBYTE 15m 3083 2002-4-9 15:28:57 12 1 FECUNCORBK 15m 0 2002-4-9 15:28:57

Plug the board and after a board of RLOS alarm disappears, analyze the reasons for this situation. A: LWC single-board hardware DIP switch control board FEC function, the default is FEC mode can be changed via the command line FEC function switch settings, but after a hardware reset, software settings fail, the board of FEC function defaults to the hardware settings ( 1 minute). Cause: closed-ended signal is non- FEC mode, LWC will be reported to the board RLOS alarm ( 2 points), 12 -bit board LWC board query performance data error correction appeared in several shows FEC function has been opened, indicating that the received signal is with the FEC mode ( 1 minute).

17, (6 points) A 16 × 2.5G engineering, configuration, three waves of business (1, 5, 9 waves), the originator of the use of the coupling type combiner, engineers found a 2011 B station A to station B stations fifth wave of business interruption (SDH Division I of Opti × 2500 + equipment), other channels of business properly. A fifth wave TWC site without any warning, the performance data of normal; site B received the fifth wave of RWC board input optical power is normal, but 15 minutes performance data for a large number of B1 BER, and the fifth wave of RWC occasionally reported RLOF alarm, SDH optical blackboard RLOS alarm. Site A, only the first 10 waves of TWC prepared plates, Site B does not have any backup board, how to restore service as quickly as possible? A: Only 5 -channel businesses affected, indicating that the problem is not a light amplifier board, the fault has two points: the originator of the TWC , the receiving end of the RWC ; First, because the receiving end did not TWC / RWC backup board will D16 first five output ports directly connected with pigtails S16 's IN port, excluding the receiving end of the fault ( 3 points); The second step, the replacement for the first 10 waves TWC veneer, while the receiving end D16 first 5 ports and 10 ports pigtail swap ( 3 points).

18 (4 points) Fill in the blanks in the following table veneer of input optical power commissioning typical:

Veneer species Typical values (dBm) WLA (30dB gain ) -25

WPA03 (single wave) -18 WPA02 (single wave) -25 WBA02 (single wave) -18

(An empty 1 point) 19 , ( 5 points)

Below 2500 + dual-fiber unidirectional consisting of PP protection ring, # 1 for the SNCP node with a chain, the business focused on the # 4 network elements; If you want to create a # 4 to # 7 bidirectional E1 path, then you need to create how kind of VC4 service path? (Required to create as little as possible in the case of a path can meet the requirements)

(Path Description Format Example: If # 2 to # 3 is written as a two-way path, # 2 < - > # 3 , written as a one-way path, # 2 - > # 3 ; # 3 to # 2 is written as a two-way path, #

3 < - > # 2 , Written as a one-way path, # 3 - > # 2 ;)

Highlights: # 1 < - > # 4 , # 1 to # 4 to create a bi- VC4 ( 1 point); # 4 < - > # 1 , # 4 to # 1 Creating a bidirectional VC4 ( 2 points); # 1 < - > # 7 or # 7 < - > # 1 , # 1 to # 7 to create a bidirectional VC4 ( 2 points); If paragraphs VC4 can also create a separate score; PP ring if it is a two-way was wrong, the whole question of zero points; create two opposite way can the chain; 20 , 2.5G ring first 5 months VC4 service configuration is shown below. Where # 2 to # 4 business between network elements through # 3 NE feedthrough and # 3 NE

were in full bloom.

( 1 ) Analysis of the # 2 and # 3 cable break between network elements, after switching multiplex section, # 2 , # 4 business connections between network elements is normal. ( 3 points) Normal , ( 2 ) analysis of the # 3 NE-down complex with paragraph after switching, the first five months VC4 business connections between the various network elements. ( 3 points) Business will be mistakenly connected. PQ1 # 2-1- ( 1 ~ 31 ) ← → # 4-1-PQ1 ( 32 ~ 62 ) PQ1-1-# 2 ( 32 ~ 62 ) ← → # 4-1-PQ1 ( 1 ~ 31 ) 21 , 2500 + ring the first three months VC4 service configuration as shown below, # 2 and # 3 opened between NE VC4 level ATM business, # 3 and # 4 opened between NE 63 months 2M business. Inspection found that # 2 , # 3 , # 4 NE with sptp command S16 board first 11 months VC4 set into high-level overhead is not the

Ë«Ï Ëµ¥Ï òPP»· SNCP½Úµã

STM-16 STM-4 STM-4#1

#2#3

#4

#5

#6 #7

end. Write # 3 East after switching operations are normal, and specify the

reasons. ( 3 points)

Is not normal; Low overhead business can not be a penetrating way.

22 , the network diagram and slot allocation chart below:

Each network element using the ring 2500 + devices, host software 4.5.2.8 , S16 board software is 2.14 , XCS board software is 3.13 . Two 2 -fiber multiplex section protection ring network elements 9 & 10 -bit for the group ring plate S16 , B , C , E , F by five board-bit SL4 connection RING1 and RING2 . The whole network is not open clock protection, NE A external trace G.812 2M BIT clock, RING1 each network element by the West to track synchronized to the network element A , RING2 NE E track RING1 NE E , west to synchronize other network elements in the network Yuan E . Each network element service configuration shown in slot allocation table, the slot allocation table black dots represent the NE landing 2M business. Question 1 , the user requires configuration A to point G bidirectional point 155M business, under normal circumstances, the business through D and H NE, with

two rings unused second VC4 parts. Business Source J1 byte " TEST ", C2 byte is " 13 ", the default high-level overhead traffic source can be changed. Requirements B , C , E , F any one network element fails, the business can automatically protect business remains within each ring MSP protection. A ) Please analyzed as to meet user requirements, data must be made online and explain the reasons for any adjustments, and provide a minimum of adjustment programs. ( 2 points) RING1 the second VC4 in A ~ C business must be adjusted to other VC4 , because the DNI when networking BC will be copied between the business, otherwise it will cause business conflict. C ) After correctly configured business, business sources and 2500 + other data devices remain the default state, whether normal network protection switching? Please explain why and provide the most simple solution. ( 4 points) Not normal switching. Because 155M business source J1 byte inconsistent, our device configuration 155M in a business, the overhead light panel feedthrough mode by default, will cause SDH equipment SNCP node detects HP-TIM . HP-TIM is SNCP switching the default condition, this will cause SNCP node detects the state of business as bad, not the normal switching. Solution: The default business sources J1 Our equipment is set to the default J1 can. Our equipment can do to change. Other solutions are very troublesome. Question 2 , the user decides to increase the XCS board equipment to improve network security, please A Case Study Descriptions point increase XCS board steps and precautions. ( 4 points) 1 , the total amount of fat increases the cross-profile board 2 , check whether the new cross-board hardware version and the old board can cross the main standby configuration. 3 , check the spare jumper cross board to output 2MHz . 4 , installation of cross plate. 5 , check the software version of the case. 23 , Chinese Translation ( 10 points) For subscriber networks, they are located at the edge of the whole network and do not

require high service capacity. Moreover, most of their service s are concentrated on one node (ie terminal office). Therefore unidirectional rings relatively simple and economical, especially unidirectional path switching rings, are very suitable for such application.

For interoffice communication networks, there are always a large quantity of services between nodes and every node requires powerful add and drop ability. In such application, bi-directional rings with large service capacity are an excellent choice. If all services are concentrated on some node (eg a hub office), unidirectional path switching rings are practicable too.

Networks for the user, as in the boundary of the entire network, no high traffic capacity requirements, and most of the traffic on the aggregation node (end office), which is related to simple unidirectional ring And economical, especially unidirectional path switched ring is very suitable for this application;

For the company's internal communications network between nodes and each node has a lot of business and usually requires a strong operational capacity of up and down, for this application, the business has a huge capacity of the bidirectional ring is an excellent choice. If all of the business to focus on (sink outcome) several nodes can also be applied unidirectional path switched ring.