Circuit Emulation (Cpipe) Services; Cpipe Service Overview; Cpipe Service Modes; Unstructured Mode (Satop) - Alcatel-Lucent 7210 SAS M Service Manual

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Circuit Emulation (Cpipe) Services

Note: Circuit Emulation Services are not supported on 7210 SAS-M devices configured in access

uplink mode.

Cpipe service is the Alcatel-Lucent implementation of TDM pseudowire VLL as defined in the

IETF PWE3 working group.

The 7210 SAS M can support TDM circuit applications that are able to transport delay sensitive

TDM traffic over a packet network. For example, in case of business that use legacy T1/E1

interfaces, Cpipe services provide transport services. Cpipe services over MPLS or GRE tunnels

are supported.

The TDM traffic is transported encapsulated in a TDM VLL over the packet switched network

(PSN). The entire T1/E1 frame or part of a frame (n × 64 kb/s) is carried as a TDM VLL over the

PSN. At the far end, the transport layer frame structure is regenerated when structured circuit

emulation is used, or simply forwarded as part of the payload when unstructured circuit emulation

Cpipe services support unstructured circuit emulation mode (SAToP) as per RFC 4553, Structure-

Agnostic Tim e Division Multiplexing (TDM) over Packet (SAToP), and structured circuit

emulation mode (CESoPSN) for DS1, E1 and n × 64 kb/s circuits as per RFC 5086, Structure-

Aware Tim e Division Multiplexed (TDM) Circuit Em ulation Service over Packet Switched

Network (CESoPSN).

Structure-agnostic TDM over Packet (SAToP) is an unstructured circuit emulation mode used for

the transport of unstructured TDM or structured TDM (where the structure is ignored).

Note: The word agnostic is used in RFC 4553, but it is not used in the literal sense. The meaning

of agnostic in this case is .unaware or independent. Therefore, structure-agnostic is used to mean

structure-unaware or structure-independent.

As a structure-unaware or structure-independent service, SAToP service does not align to any

framing; the framing mode for the port is set to unframed. For structured TDM, SAToP disregards

7210 SAS M Services Guide

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