Circuit Emulation VLL (Cpipe) Services
Page 140 7705 SAR OS Services Guide
Circuit Emulation VLL (Cpipe) Services
This section provides information about the Cpipe service.
Topics in this section include:
• Cpipe Service Overview
→ TDM SAP-to-SAP Service
→ Cpipe Service Modes
→ TDM PW Encapsulation
→ Circuit Emulation Parameters and Options
→ Error Situations
Cpipe configuration information is found under the following topics:
• Common Configuration Tasks on page 198
• Configuring VLL Components on page 199
→ Creating a Cpipe Service on page 204
• Service Management Tasks on page 221
Cpipe Service Overview
Cpipe service is the Alcatel-Lucent implementation of TDM PW VLL as defined in the
IETF PWE3 working group.
The 7705 SAR can support TDM circuit applications that are able to transport delay-
sensitive TDM traffic over a packet network. For example, in the case of cell site
aggregation, Cpipe services provide transport service for 2G connectivity between the base
transceiver station and the base station controller, and for 3G backhaul applications (for
example, EVDO traffic from T1/E1 ports with MLPPP). Cpipe services over MPLS or GRE
tunnels are supported.
The 2G 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 is used. The 3G UMTS R99 traffic uses ATM/IMA as the
transport protocol. The IMA sessions are terminated at the site by the 7705 SAR and the 3G
ATM traffic is transported across the PSN through the use of ATM VLLs (PWE3).
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