Background

• Early 2000 Decision for Continued Campus Service

• Approval for 2001-02 Campus Funding

• Slow Alternative Service Materialization within Davis

Usage Profiles

 Last Year (Fall) Current Year (Fall)

Faculty 1,407 1,231 Staff 2,036 1,783 Students 8,304 7,202

Current Trends

• Contention Ratios:– Faculty: 7:1– Staff: 9:1– Students: 9:1

• Average On-line Time Per Session:– Faculty: 34 minutes– Staff: 34 minutes– Students: 30 minutes

Modem Weekly Use – Faculty

Modem Weekly Use – Staff

Modem Weekly Use – Students

Current Cost Summary

Scenario CampusFaculty Pool (4 Hour Session Limits; Unlimited Sessions)Faculty Users 1231Contention Ratio 7:1Faculty Modems 186

Administration Pool (2 Hour Session Limits; Unlimited Sessions)Administrative Users 1783Contention Ratio 9:1Administrative Modems 188

Student Pool (2 Hour Session Limits; Unlimited Sessions)Student Users 7202Contention Ratio 9:1Student Modems 756

Total Internal Users 10216Total Internal Modems 1130

Annual Cost Breakdown 2002-03Line Charges 234,113$ Equipment Maintenance 37,591$ Total 271,705$

Modem Pool Recommendations,Option 1

• Reduce one Primary Rate Interface (PRI) circuit (24 lines) from each modem pool, respectively.– Advantages

• Reduce Costs ($14,630 annual savings).• Minimum service level degradation.

– Disadvantages• Expensive to reinstall, if needed.• Introduce busy signal to users (largest

impact to student and staff users).

Modem Pool Recommendations,Option 2

• Reduce PRI circuits by 14, introducing busy signal during peak hours (approx. 2-4 hrs.). – Advantages

• Reduce costs ($68,000 annual savings).– Disadvantages

• Significant busy signals during peak hours.• Increase of complaint calls to Data Center

and Network Operations Center• Increase time to diagnose network problems.• Expensive to reinstall, if needed.

Modem Pool Recommendations,Option 2

Modem Pool

Peak Usage Time

Total Peak Busy

PRI’s Reduction

Line Reduction

Contention Ratio

Faculty 8-10 pm 2 hrs 3 72 10:1Staff 6-10 pm 4 hrs 3 72 15:1Student 9-12 pm 3 hrs 8 192 12:1TOTAL 14 336

Modem Pool Recommendations,Option 3

• Consolidate all modem pools into one; reduce PRI circuits by 16; and remove 2 Cisco AS5200 and 2 Cisco AS5300 Access Servers.

– Advantages

• Reduce costs ($91,000 annual savings).

– Disadvantages

• Single point of failure for all dial-in customers.

• Severe increase in busy signals during peak hours.

• Significant increase of complaint calls to Data Center and Network Operations Center.

• Increase network troubleshooting complexity.

• Increase in third party vendor dependency (Pacific Bell).

• Expensive to reinstall, if needed.

Modem Pool Recommendations,Option 3

Modem Pool

Peak Usage Time

Total Peak Busy

PRI’s Reduction

Line Reduction

Contention Ratio

Single 6pm-12 am 6 hrs 16 384 13:1

Discussion

• Approach to Continued Service

• Service Levels

• Funding