2-77
Cisco MGX 8800/8900 Series Hardware Installation Guide
Releases 2 - 5.2, Part Number OL-4545-01, Rev. H0, May 2006
Chapter2 Illustrated Card List for MGX Switches and the MGX 8880 Med ia Gateway
Front Cards
VISM-PR

Supported models: MGX 8850 (PXM1E/PXM45), MGX 8850/B (PXM1E/PXM45), MGX 8880

The VISM-PR, in combination with a Cisco MGX switch, enable s telephone calls on conventional
time-division multiplexed (TDM) voice circuits to be transported over ATM packet-switched and
VoIPnetworks.
The VISM-PRs provide toll-quality voice, fax, and modem transmission and efficient utilization of
wide-area bandwidth through industry standard implementations of echo cancellation ,
voice-compression, and silence-suppression techniques.
The VISM-PR and Cisco MGX switch combination provides an interface, or voice gateway, between
conventional TDM networks and packet-switched networks (see Figure 2-36).
Figure2-36 MGX 8850 and VISM as a Voice Gateway
The switch connects to the packet network through use of the switch’s processor switching modules
(PXM45 or PXM1E). The processor switching modules communica te with a VISM-PR through the
switch midplane cell bus.
When the VISM-PR is combined with a back card, a card set is created. Table 2-3 2 provides information
about each VISM-PR, interface, and corresponding backcard.
V
T1/E1
PBX or
Central Office MGX switch
with
VISM
Packet Network
(IP/ATM)
Voice/TDM Networks
Packet Networks
80668
Table2-32 VISM-PRs, Interfaces, and Supported Back Cards
VISM-PR
Interface
Connections
Number of Lines
Supported
Types of Lines
Supported Supported Back Cards
VISM-PR-8E1 Trunk Up to 8 E1 TDM •MGX-RJ48-8E1 (for
use in Australia)
•RJ48-8E1
•R-RJ48-8E1
•SMB-8E1
•R-SMB-8E1
VISM-PR-8T1 Trunk Up to 8 T1 TDM •RJ48-8T1
•R-RJ48-8T1