Huawei-DDF ODF MDF

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Huawei DDF ODF MDF

Text of Huawei-DDF ODF MDF

13.Huawei DDF Product survey
SDH
D
W
D
M
D
W
D
M
SDH
SDH
SDH
SDH
SDH
SDH
ODF
ODF
DWDM
ODF
ODF
ODF
ATM875
Digital Distribution FrameDDF
DDF is a distribution and connection device between digital multiplex, and between a digital multiplex device and a program-controlled exchange device or a non-voice service device.
The loops in DDF formed by the branch circuits of receiving and transmitting ( also named as loop, system or E1)
2M/bit
Loop
Adopting balanced cable and the connector unit with 120Ω characteristic impedance.
120Ω/120Ω Balanced connector unit
75Ω/75Ω Unbalanced connector unit
Functional assemblies composed by numbers of E1 (also called unit).
Adopting RF coaxial cable and the connector unit with 75Ω characteristic impedance.


75Ω/120Ω Impedance transforming connector unit
Transform the connecting mode of RF coaxial cables with 75Ω characteristic impedance to the mode of balanced cables with 120Ω characteristic impedance.
Impedance matching
The internal resistance of signal source is the same with characteristic impedance of the transmission line in quantity and phase; or characteristic impedance of the transmission line is the same with impedance of load in quantity and phase; which means respectively input or output impedance matching of transmission line.


1.6/5.6 RF coaxial connector
In fact, the RF coaxial connector is also a coaxial transmission line, in which there are separable electric contact unit, connecting unit and other device for installation and termination.
BNC RF coaxial connector




Engineering
surveys
Impedance of DDF connector
Height of raised floor;
length of grounding wire;
Dimension of product-frame/cabinet (main height)
The outer diameter of cable sheath and insulating layer should be known if the cable model is unknown; the connector is male: connected the coaxial cable with inner conductor by welding and with external conductor by crimping;
Generally, the model of transmission side differs from that of the exchange side;
Needed information , such as manufacture ,model and specifications of existing DDF;
Ensure the equipment compatible and in accordance with the existing ones ;
75 ΩOr 120Ω
Unit Jacket
Solid Conductor-ø (mm)
Identifier
Coaxial
Connector
1.6/5.6
1.6/5.6
1.6/5.6
1.6/5.6
1.5/6.5
1.5/6.5
1.5/6.5
1.6/5.6
1.6/5.6
1.5/6.5
Solid Conductor: Ø 0.25 mm
Insulation: Ø 1.20 mm
Shield: Ø 1.8 mm
Material: Polyvinyl Chloride (PVC)


Inner Conductor: Ø 0.4 mm
Sheath: Ø 4.0mm
S: Strand inner conductor
V: Single braid outer conductor
W: Double braid outer conductor
2 : PE Insulation dielectric core
C :Characteristic impedance 75 ohm
D :Characteristic impedance 50 ohm
3 :Approx. diameter of dielectric core
So SYFVZ-75-1-1 can be compared to 1.2C-2V
                                     
Product Code
4.0 mm PVC
5.0 mm PVC
5.0 mm PVC
5.0 mm PVC
5.2 mm PVC
6.9 mm PVC
6.9 mm PVC
6.9 mm PVC
6.9 mm PVC
Product Profile
(Particular Description refer to Appendix)
3. Surveys of Huawei ODF Product




2. Technical terms in ODF
Patch cord( Fiber jumper): a optical cable with adapter on both ends;
Tail fiber (Pigtail fiber) a optical cable with adapter on one end;
Adapter: is the devices that make optical connection between tail fibers and patch cords. FC/PC adapters are usually used in ODF, SC/PC adapters are used in some ODF.
ODF Product Profile
. Fixing and protection function
Entry unit of optical-fibers in C series cabinet
Entry unit of optical-fibers in R series cabinet


ODF Product Profile (Function)


5.Fiber storage function
Bare fiber protection
5Connection of optical-fiber
ODF is mainly used for optical-fibers splicing, fixing, and connection. The connection modes are given as following:
. Connection between optical cables and optical equipment:


Direct connection between optical cables


. Cross connection between optical cables




ODF Product
Wall mount
Frame Series
Cabinet Series
Particular Description refer to appendix
3. Surveys of Huawei ODF Product


Net height of room &
height of raised floor;
length of grounding wire;
Cable outlet mode ( upper outlet or lower outlet) ;
Adapter model;
Model of tail fiber, such as :single tail fiber (main), bundle tail fiber, Ribbon tail fiber
Needed information , such as manufacture ,model and specifications of existing ODF;
Ensure the equipment compatible and in accordance with the existing ones ;
ISSUE

2. Introduction to Huawei MDF Products (Particular Description refer to Appendix)
3. MDF Survey
MDF Product Profile
Main functions of MDF: connection, testing, protection, give alarm;
MDF is a connection and protection device in the local communication lines. One end of MDF is connected with cables of local communication lines, another end is connected to the subscribers lines of exchange . MDF have functions, such as connection with internal and external lines cables, providing protection to lines, giving alarm and testing lines.
Cross-connection
Cabinet
4. Correlative Definition for MDF
Main Distribution Frame (MDF)is a device for connection and protection in the local communication lines, the external lines of MDF connect the copper-core twisted pair local call cables and the internal lines connect the subscriber lines of telecom exchange or access equipment .
Double-side jumper MDF: is composed of back-to-back horizontal and vertical rows, in which the horizontal rows are used to install exchange side terminal blocks, and the vertical rows are used to install cable side terminal blocks.
Single-side jumper MDF: has both the jumper terminals of external and internal lines set on the same side. A single-side jumper MDF is constructed by terminal frames and corresponding horizontal and vertical wiring troughs, and can be lined in multiple columns. The cable side terminal blocks and exchange side terminal blocks can be either separately installed on different terminal frames or mixed installed on the same terminal frames.
Cable side terminal block: is used for terminating external cables and connecting jumpers, and also can be equipped with a protective unit (generally known as vertical terminal block, protective-testing connecting block, protective connecting block, external cable terminal block , and so on ).
Exchange side terminal block: is used for terminating intra-office cables and connecting jumpers, and is able to implement test (generally known as horizontal terminal block, testing connecting block, internal cable terminal connecting block , and so on ) .
Protective unit: is used to prevent injury on the operator and damage on equipment caused by over-voltage and over-current, also known as protector.
MDF Product Profile
5.Composing of MDF
MDF Product Profile
Frame: can be sorted as double-sided frame, single-sided frame, and wall-mounted frame according to cabling mode or installation mode.
Cabinet :can be sorted as double-sided cabinet, single-sided cabinet, and wall-mounted cabinet according to cabling mode or installation mode.
Cable side terminal block: can be sorted as 10/20 pair terminal strip, 100/200 pair terminal block according to distribution capacity;
Can be sorted as welding connection type, wrapping connecting type, half IDC and half wrapping connection type and IDC connection type according to connection mode;
Can be sorted as stationary type, revolving type according to structure;
Exchange side terminal block: can be sorted as 8/16 pair terminal strip, 128/256 pair terminal block according to distribution capacity;
Can be sorted as welding connection type, wrapping connecting type, half IDC and half wrapping connection type and IDC connection type according to connection mode;
Can be sorted as stationary type, revolving type according to structure;
Protective unit: can be sorted as gas discharge tube type and semiconductor arrester type according to the type of discharge tube;
Can be sorted as non-self-recovery type and self-recovery type according to the characteristic of over-current device.


MDF Product Profile
Alarm system: when protective unit is plugged in the cable side terminal block properly, it connects with grounding terminal and alarm signal terminal; connect every single-column alarm in series by using the wires in the back of MDF and then connect to the general alarm, thus a completed alarm system is formed.
IDC (Insulation Displacement Connection) tool: the special tool used to terminate the cables to corresponding terminals, which can be sorted as wrapping connection gun and IDC tool;
Testing plug: is the plug-in unit used to testing internal and external lines;
Open-circuit plug: is the plastic insulating unit used to disconnect the connection of internal and external lines;
Ladder: is used for maintenance, which can be sorted as movable ladder, slide ladder and high stool according to structure.


2. Introduction to Huawei MDF Products (Particular Description refer to Appendix)
3. MDF Surveys
1.JPX202 MDF series product
2.Application of JPX202 MDF
Double-sided frame F: applicable to large office or equipment room with sufficient space;
Wall-mounted frame GQ: applicable to enterprise or the office where MDF need to be installed on walls;
Cabinet B/C: applicable to small capacity office or equipment where there are distribution frames and other cabinet-type devices.
JPX202 MDF
Single-sided frame SF: applicable to small office or equipment room with limited space , where MDF need to be installed against walls ;


3.JPX256 MDF (mainly applicable to access network ONU built-in type):
Introduction to Huawei MDF Products
Frame/cabinet


*
4.Cable side terminal block FA8-123 and exchange side terminal block STO-128
FA8-123 is a 10-pair cable side terminal block ;
The protective unit is unplugged from the front of terminal block, and the visual alarm is display in front of the terminal block too, which is convenient for troubleshooting;
introduce cables from the back of the terminal block, connect jumpers on both side , insert or remove wires with IDC tool in front the terminal blocks.
STO-128 is a 8-pair exchange side terminal block ;
introduce cables from the back of the terminal block, connect jumpers on both side , insert or remove wires with IDC tool in front the terminal blocks.
Introduction to Huawei MDF Products
FA8-123
STO-128
5.Protective unit FA9-173 and FA9-172
FA9-173 gas discharge tube protective unit: is the plug-in unit with over-current and over-voltage protection functions and FS alarm function , it can be used in FA8-123 cable side terminal block.
FA9-172 semiconductor arrester protective unit: is the plug-in unit with over-current and over-voltage protection functions and alarm function , it can be used in FA8-123 cable side terminal block.
Introduction to Huawei MDF Products
FA9-173
FA9-172
6.Testing cord and open-circuit plug
Testing cord: is the plug-in unit used to test the internal and external lines. A pair of clips are connected to the external lines tester, the other pair of clips are connected to internal lines tester or telephone set.
Open-circuit plug: is a plastic insulating unit used to disconnect the connection of the internal or external lines on MDF. It can be used in STO128 exchange side terminal blocks.
Introduction to Huawei MDF Products
JPX256-CSS
JPX256-KLS
2. Introduction to Huawei MDF Products (Particular Description refer to Appendix)
3. MDF Survey
Length of power cable for alarm device(m)
Net height of Room/Shelter (mm)
Length of grounding cable (m)
Four major points for confirmation


H×D
A3
Height
Room
Depth
Width
Net height of room (mm): the vertical distance from the lower surface of roof board to the upper surface of the floor board (or the ground level if there is no floor board) ;
Cabling method: the cable entry of external line and internal line is from the upper or lower side of the frame (cabinet); for upper cable entry, the height of cabling trough should be considered.


Ground
Net height of Room/shelter floor (mm): vertical distance from the ground surface to the upper surface of the floor board
3: Net Height of Room/Shelter Floor
Configure according to height
MDF
Shelter
wire
Length of power wire for alarm device(m): length of power wire from MDF to power supply of -48V


MDF
50mm~2 yellow-green round fireproof cable is adopted in frame
25mm~2 yellow-green round fireproof cable is adopted in cabinet
Length of grounding cable (m): length of grounding cable from protection grounding bus of room/shelter to MDF grounding bar
Specification of grounding cable:
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