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86 Avaya Application Solutions IP Telephony Deployment Guide
The C-LAN circuit pack is used for all IP call signaling for both IP trunks and stations. This circuit
pack also provides TCP/IP connectivity to such adjuncts and synchronous applications as Call
Management System (CMS) and INTUITY AUDIX.
This circuit pack also supports firmware download capability for all firmware-downloadable
circuit packs in a PN, which allows administrators to remotely update the firmware or application
code of circuit packs such as the TN799DP (C-LAN) or TN2302AP Media Processor.
The S8700-series platforms support a maximum of 64 C-LAN circuit packs per system (106 on
the extra large or XL configuration of the S8720 Server). The number of C-LAN circuit packs
that are required depends on the number of IP endpoints that are connected, and the options
that the endpoints use. For example, it might be advantageous to segregate IP voice control
traffic from device control traffic.
IP Media Processor (TN2302AP, TN2602AP) - The TN2302AP IP Media Processor and the
TN2602AP IP Media Resource 320 circuit packs are media processors that provide gateways
between the TDM bus and the Ethernet network for audio streams.
Configurations using the S8700-series Servers require resources on TN2302AP and/or
TN2602AP media processor circuit packs for IP Telephony bearer communications. TN2302AP
and TN2602AP each include a 10/100 BaseT Ethernet interface to support IP trunks and H.323
endpoints. Media processor circuit packs can perform echo cancellation, silence suppression,
dual-tone multi-frequency (DTMF) detection, and conferencing.
As shown in Figure 25:
TN2302AP Media Processor operation on page 87, the media
processor converts circuit-switched audio streams to packet-switched streams. The media
processor supports multiple codecs, so it can compress audio samples during packetization.
When needed for conference calls, it can also take multiple audio streams, sum them together,
and send the resulting audio stream to multiple recipients on the network. Note that the
TN2602AP uses the same media processor principles as the TN2302AP.
Starting with release 3.1 of Communication Manager, the TN2602AP IP Media Resource 320
can be duplicated to provide critical bearer reliability for IP-connected port networks.