optical migration for tdm local access · presentation_id © 2007 cisco systems, inc. all rights...

© 2007 Cisco Systems, Inc. All rights reserved. Cisco PublicPresentation_ID 1

Optical Migration for TDM Local AccessHow Cisco IT Migrated TDM Local Access from SONET to OC-192 Infrastructure

A Cisco on Cisco Case Study: Inside Cisco IT


Overview

ChallengeMigrate Cisco San Jose headquarters campus local access network from individual OC-48 SONET rings to a campus-wide OC-192 SONET infrastructure

SolutionCisco ONS 15454 switches in each Cisco building and four local exchange carrier (LEC) points of presence (POP)

ResultsEasier expansion of customer-provided access to additional buildings, and greater control over capacity planning

Next StepsNow that major circuits are migrated, migrate T1s


Background: Connecting Cisco Employees to Outside World

Access to Cisco WAN, PSTN, or Internet requires connectivity to public switched telephone network (PSTN)

A local access network connects Cisco campus and the local exchange carrier (LEC) or inter-exchange carrier (IXC) point of presence (POP)

Local access network is based on synchronous optical networking (SONET) technology


Background: The Legacy Cisco Local Access Network

Cisco owned local access infrastructure for eight buildings with highest circuit volume; leased from LEC for remaining 40+ buildings

When LEC owns local access infrastructure, capacity is often shared by other nearby companies

Drawback: potential project delays while LEC provisions more capacity

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Background: Before, Six Disconnected SONET Rings Touch Eight Buildings


Challenge: ‘Spot Solution’ for Local Access No Longer Met Business Needs

Problems with Cisco’s legacy local access infrastructure:

Difficulty of adding unlit buildings to SONET rings—or even adding more SONET capacity to buildings on the rings

High management burden

Inefficient capacity planning: ring by ring

Large footprint and power requirements for legacy equipment


Challenge: Reduce Local Access Costs

If LEC owns local access infrastructure, Cisco pays tariff rates

If Cisco owns local access infrastructure, Cisco pays:One-time fee for infrastructure

Lower monthly usage fee for circuits

Whether customer-provided access or LEC-provided access is more cost-effective comes down to volume


Solution: Campus-Wide Infrastructure

Interconnects 26 Cisco buildings with four central office locations

Multiple LEC locations provide redundancy and fault tolerance

Cisco ONS 15454 switches in each Cisco or LEC location


Solution: After, Two OC-192 Rings Touch 26 Buildings

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Solution: Cutover Process

The challenge: migrating more than 800 voice, video, and data circuits without disruption!

For each circuit:Cisco personnel removed circuit from production

SBC technician at Cisco repatched circuit from the legacy SONET switch to the Cisco ONS 15454 switch

SBC technician at CO moved cross-connect at the same time

Cisco circuit owner verified proper operation and put it back into service

Elapsed time: 5 to 10 minutes per circuit

Critical services experienced no down time, because traffic was rerouted across a redundant path


Results: Easier Expansion to Additional Buildings

Now 26 buildings instead of eight enjoy the benefits of customer-provided access:

Cost savings

Simplified capacity planning

Reduced footprint and power requirements

Cisco IT can relatively easily extend its SONET infrastructure to additional buildings as their local access needs grow


Results: Greater Control Over Capacity Planning

Expanded SONET infrastructure enables Cisco IT to self-manage local access capacity in more buildings—26 instead of 8

Cisco no longer must gamble that LEC can provide additional capacity when needed

If a lab moves, Cisco IT provisioning team runs usage and capacity reports on-demand to determine whether additional circuits are needed


Results: Reduced Costs

Cisco paid one-time fee to the LEC for a dedicated SONET structureMonthly bills dropped 14% compared to the cost for single-building connectionsReal estate savings

New construction costs for San Jose campus = $150 per square footLegacy equipment required 160 square feet, or $24,000Savings for providing OC-48 access in 26 buildings = $624,000Additional savings: $6.65 per square foot in yearly operating costs, or $27,664 PLUS, more space available for expansion or for other network initiatives


Results: Reduced Footprint and Power Consumption

Background: Legacy infrastructure to support OC-48

Foreground: Cisco ONS 15454 infrastructure to support OC-48 and OC-192


Next Steps: Migrate T1 Circuits

Migration of large circuits is complete (May 2005)T3, Gigabit Ethernet, OC-3, OC-12

Next up: T1 and primary rate interface (PRI) lines

To ensure uninterrupted phone service, Cisco IT will “busy out” each circuit so that calls roll over to the next line

Key to success: careful planning and coordination with service provider!


To read the entire case study, or for additional Cisco IT case studies on a variety of business solutions, visit Cisco on Cisco: Inside Cisco IT

www.cisco.com/go/ciscoit

http://www.cisco.com/go/ciscoit

optical migration for tdm local access · presentation_id © 2007 cisco systems, inc. all rights...

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