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Why PWE3 Should Adopt TDMoIP

This research explores the benefits of adopting TDMoIP for various applications such as leased line services, toll bypass, cellular backhaul, and carrier's carrier services. It delves into the reuse of existing AAL1 technologies, the need for interworking with ATM, and the simplicity of upgrading to IP/MPLS infrastructure. The conclusion emphasizes the risk-free, fast implementation of TDMoIP and recommends its adoption in PWE3 for TDM emulation over IP/MPLS.

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Why PWE3 Should Adopt TDMoIP

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  1. Why PWE3 Should Adopt TDMoIP Shahram Davari Product Research Group PMC-Sierra Shahram_davari@pmc-sierra.com

  2. 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

  3. 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)

  4. Need for Interworking with ATM • Interworking with ATM is often required. • Carriers currently use ATM for circuit/loop emulation Simple and inexpensive RADview SNMP Manager T1/E1 T1/E1 ATM SAR ATM CES TDMoIP IP/MPLS ATM TDMoIP ATM CES T1/E1 Complex and costly SAR << TDMoIP + ATMCES

  5. Ease of Interworking between ATM CES and TDMoIP/MPLS AAL1 PDU AAL1 SAR IP/MPLS ATM IP/MPLS AAL1 PDU TDMoIP/MPLS SAR … ATM ATM ATM ATM CES

  6. 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

  7. Preserve existing Layer 2 ATM Infrastructure T1/J1/E1 Framers TU/VT Mappers M13 Muxes T3 Framers AAL1 Engine HDLC Engine TDM Framer TDM Framer Sonet Framer TDM Framer IMA Engine Software Upgrade to IP/MPLS Infrastructure SONET/SDH Framer optics NP TM & Policing IP/MPLS Inteworking AAL1 SAR/CES Structured & Unstructured Easy Upgrade to IP/MPLS CES from Current ASAP

  8. 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

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