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Why PWE3 Should Adopt TDMoIP

Shahram DavariProduct Research Group

PMC-Sierra

Shahram_davari@pmc-sierra.com

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PMC-Sierra

Some Applications of TDMoIP

Leased line services over IP/MPLS- Between a customer site and a PoP

Private line service over IP/MPLS- Between two customer sites (PSTN bypass)

Toll bypass- Between two Central Offices (CO)

Cellular backhaul over IP/MPLS- Between BTS and BSC

Carrier’s carrier

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PMC-Sierra

Reuse of Existing Technologies

AAL1 is designed for circuit and loop emulation AAL1 is a proven technologies with off-the-

shelf or available HW/SW AAL1 has a number of desirable features

- Clock recovery mechanism

- Structure pointer (for multi-frame recovery)

- Support for CAS

- Support for structured and unstructured TDM

- Support for Nx64 Kbit/sec

- Optional error correction (FEC)

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PMC-Sierra

Need for Interworking with ATM

Interworking with ATM is often required.- Carriers currently use ATM for circuit/loop emulation

IP/MPLS

T1/E1

RADview SNMP Manager

ATM

TDMoIPATM CES

T1/E1

ATM SAR

T1/E1TDMoIPATM CES

SAR << TDMoIP + ATMCES

Complex and costly

Simple and inexpensive

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PMC-Sierra

Ease of Interworking between ATM CES and TDMoIP/MPLS

AAL1 PDU

AAL1 SAR

ATMIP/MPLS

AAL1 PDUIP/MPLS

ATM ATM ATM…

TDMoIP/MPLS

ATM CES

SAR

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PMC-Sierra

ASAP Reuse

Any Service Any Port is an important architecture- It supports any service using a single card

- It reduces inventory for network operators

- It reduces the vendor’s development cost Current ASAPs support AAL1

- They can easily be SW upgraded to support TDMoIP- Providers don’t need to acquire new cards, they can re-use existing cards.

- Any other method requires new HW and major change of ASAP architecture

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PMC-Sierra

Easy Upgrade to IP/MPLS CES from Current ASAP

SONET/SDHFramer

T1/J1/E1 FramersTU/VT Mappers

M13 MuxesT3 Framers

optics

AAL1 SAR/CESStructured & Unstructured

Preserve existing Layer 2 ATM Infrastructure

NP TM & Policing

IP/MPLSInteworking

Software Upgrade to IP/MPLS

InfrastructureTDM Framer

TDM Framer

TDM Framer

Sonet Framer

HDLC Engine

IMA Engine

AAL1 Engine

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PMC-Sierra

Conclusion

TDMoIP is based on proven AAL1 technology no risk

TDMoIP is based on off-the-shelf or available AAL1 HW/SW fast time to market

TDMoIP Interworks seamlessly with ATM easier and less expensive Interworking

PWE3 should adopt TDMoIP for TDM emulation over IP/MPLS