Cisco MC3810-APM-FXO= Datasheet download pdf (Page 25)

Configuring Voice Ports

Configuring Digital Voice Ports

VC-59

Cisco IOS Voice, Video, and Fax Configuration Guide

The MFT VWICs that are used in the packet voice trunk network modules are available in one- and

two-port configurations for T1 and for E1, and in two-port configurations with drop-and-insert capability

for T1 and E1. MFTs support the following kinds of traffic:

• Data. As WICs for T1 or E1 applications, including fractional data line use, the T1 version includes

a fully managed DSU/CSU, and the E1 version includes a fully managed DSU.

• Packet voice. As VWICs included with the digital T1 or E1 packet voice trunk network module to

provide connections to PBXs and COs, the MFTs enable packet voice applications.

• Multiplexed voice and data. Some two-port T1 or E1 VWICs can provide drop-and-insert

multiplexing services with integrated DSU/CSUs. For example, when used with a digital T1 packet

voice trunk network module, drop-and-insert allows 64-kbps DS0 channels to be taken from one T1

and digitally cross-connected to 64-kbps DS0 channels on another T1. Drop and insert, sometimes

called TDM cross-connect, uses circuit switching rather than the DSPs that VoIP technology

employs. (Drop-and-insert is described in the “Configuring Trunk Connections and Trunk

Conditioning Features” chapter in this configuration guide.)

The digital T1 or E1 packet voice trunk network module contains five 72-pin Single In-line Memory

Module (SIMM) sockets or banks, numbered 0 through 4, for PVDMs. Each socket can be filled with a

single 72-pin PVDM, and there must be at least one packet voice data module (PVDM-12) in the network

module to process voice calls. Each PVDM holds three digital signal processors (DSPs), so with five

PVDM slots populated, a total of 15 DSPs are provided. High-complexity codecs support two

simultaneous calls on each DSP, and medium-complexity codecs support four calls on each DSP. A

digital T1 or E1 packet voice trunk network module can support the following numbers of channels:

• When the digital T1 or E1 packet voice trunk network module is configured for high-complexity

codec mode, up to six voice or fax calls can be completed per PVDM-12, using the following codecs:

G.711, G.726, G.729, G729 Annex A (E1), G.729 Annex B, G.723.1, G723.1 Annex A (T1), G.728,

and fax relay.

• When the digital T1 or E1 packet voice trunk network module is configured for medium-complexity

codec mode, up to 12 voice or fax calls can be completed per PVDM-12, using the following codecs:

G.711, G.726, G.729 Annex A, G.729 Annex B with Annex A, and fax relay.

For more information, refer to the following publications:

• Cisco 2600 Series Hardware Installation Guide

• Cisco 3600 Series Hardware Installation Guide

• Cisco Network Module Hardware Installation Guide

• Cisco IOS Release 12.0(7)T online document Configuring 1- and 2-Port T1/E1 Multiflex Voice/WAN

Interface Cards on Cisco 2600 and 3600 Series Routers

Cisco MC3810 Multiservice Concentrator

To support a T1 or E1 digital voice interface, the Cisco MC3810 multiservice concentrator must be

equipped with a digital voice interface card (DVM). The DVM interfaces with a digital PBX, channel

bank, or video codec. It supports up to 24 channels of compressed digital voice at 8 kbps, or it can

cross-connect channelized data from user equipment directly onto the router’s trunk port for connection

to a carrier network.

The DVM is available with a balanced interface using an RJ-48 connector or with an unbalanced

interface using Bayonet-Neill-Concelman (BNC) connectors.

Optional HCMs can replace standard VCMs to operate according to the voice compression coding

algorithm (codec) specified when the Cisco MC3810 multiservice concentrator is configured. The

HCM2 provides 4 voice channels at high codec complexity and 8 channels at medium complexity. The

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