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IP over ????

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GLOBECOM ‘99

December 6, 1999

Globecom ‘99December 6, 1999

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OutlineOutlineOutlineOutline

• Concentrate on the network core

• Deficiencies with traditional SDH equipment

• Continuing role of the SDH protocol

• The emerging Intelligent Optical Core

• What role will the OTN play?

Globecom ‘99December 6, 1999

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The Single-Wavelength DisconnectThe Single-Wavelength DisconnectThe Single-Wavelength DisconnectThe Single-Wavelength Disconnect

Multi-Wavelength Transmission

SingleWavelength

TransmissionLower

Speeds

SingleWavelength

TransmissionLower

Speeds

Excessive Space, Power Long Planning Intervals Long Service Delivery Intervals High Cost of Service

Fiber Optic Cable

Globecom ‘99December 6, 1999

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CoreDirector Enables CoreDirector Enables Multi-Wavelength Multi-Wavelength NetworksNetworksCoreDirector Enables CoreDirector Enables Multi-Wavelength Multi-Wavelength NetworksNetworks

Multi-Wavelength Networking

Fiber Optic Cable

Reduced Space, Power Simplified Network Shortened Delivery Intervals Lowest Cost of Ownership

LowerSpeeds

LowerSpeeds

Globecom ‘99December 6, 1999

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Why “Eliminate SONET”Why “Eliminate SONET”Why “Eliminate SONET”Why “Eliminate SONET”

• Capital Cost Savings of 30 - 50%• Eliminates SDH ADM

• Operations Cost Savings of 50 - 60%• Simplified Network Management

• Significant Power, Floor Space Savings

Source: Enron Communications

But what does “eliminate SONET” really mean?

Globecom ‘99December 6, 1999

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SONET Box Vs. SONET ProtocolSONET Box Vs. SONET ProtocolSONET Box Vs. SONET ProtocolSONET Box Vs. SONET Protocol

• The SONET Box-why hate it?• Space, power, cost of current products

• More express traffic, less need for muxing

• The SONET/SDH Protocol-why love it?• Global standards for interoperability

• Performance management features

• Universal transport layer for voice and data

• Implemented in VLSI components

Advanced DWDM systems use the SONET protocol!Data routers and switches do too!

Globecom ‘99December 6, 1999

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Single-Wavelength Networks: Slow to Single-Wavelength Networks: Slow to Deliver ServiceDeliver ServiceSingle-Wavelength Networks: Slow to Single-Wavelength Networks: Slow to Deliver ServiceDeliver Service

IP

ATM/FR

Circuit

• Planning & Provisioning Complexity• Grooming Complexity• Long Service Delivery Interval

Typical transport network withDACS, ADM, WDM

Globecom ‘99December 6, 1999

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Rapid Service DeliveryRapid Service DeliveryRapid Service DeliveryRapid Service Delivery

Ingress

Egress

I know the network topology andcharacteristics...

…and can provide end-to-end optimizationof...

…all capacitiesacross all switchfabrics

OSRP OSRP

Radically Reduces Planning, Provisioning, and Grooming.

Fast and Easy Provisioning

Globecom ‘99December 6, 1999

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Do we need a new “Optical Layer”Do we need a new “Optical Layer”Do we need a new “Optical Layer”Do we need a new “Optical Layer”

• Does technology allow an all-optical layer?• So far, truly all-optical technology lacks the

ability to measure performance adequately

• So, the ITU is working on all-electronic solutions to optical channel management

Globecom ‘99December 6, 1999

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Optical Transport Network - ITUOptical Transport Network - ITUOptical channel overheadOptical channel overheadOptical Transport Network - ITUOptical Transport Network - ITUOptical channel overheadOptical channel overhead

OCh Overhead1 column X 16 rows

16 Octet frame

FEC16 rows X 16 columns

256 Octets

Data16 rows X 238 columns

3808 Octets

Bit rate expanded by 15/14, 7% overhead

Digital wrapper frame is based on fixed size data block(SONET/SDH is time based, with a 125 microsecond frame)

(4X superframeyields 64 total octets for Och overhead) Working assumption - no US or ITU agreement

Globecom ‘99December 6, 1999

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10G SONET/SDH Signal10G SONET/SDH Signal10G SONET/SDH Signal10G SONET/SDH Signal

Data*1,202,688 bits

Overhead for 10G Frame: 5184 bytes41472 bits per 125 microseconds =331,776,000 bits/second

* including path level overhead

Many overhead octets are undefined!

Globecom ‘99December 6, 1999

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SummarySummarySummarySummary

• Do we need a different all-electronic optical layer?

• Carriers now directly connect IP and DWDM boxes, using SDH framing

• The Optical Internetworking Forum is basing interoperability implementation agreements on SDH/SONET framing

• Dynamic control of optical networks will dramatically reduce operations costs