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Cisco Voice Interworking Services (VISM) Manual de usuario Pagina 3

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Cisco Multiservice Packet Network Solution Overview
OL-3025-01
Chapter 2 Solution Components
Media Gateways
Figure 2-2 MGX 8250 and 8850 Platforms—Front View
Voice Interworking Service Module (VISM)
The VISM is front and back card set. Each VISM supports up to eight E1 lines (using RJ48 or SMB
connectors) through ports located on the back card of the two-card set. Each line is configured either for
binary 8-zero substitution (B8ZS) or alternate mask inversion (AMI) coding, with voice compression to
G.711, G.726 (32K), and G.729ab coder-decoder (codec) standards. Line failures that are detected cause
the VISM to generate E1 facility alarms, and lines can be tested using continuity tests and line
loopbacks. The VISM can connect directly to the time-division multiplexing (TDM) E1 lines through
ports located on the back card, or optionally via the bulk distribution capability of the SRM/E card.
The VISM communicates with the packet network for transmitting and receiving the voice payload by
using the STM-1 port on the PXM-1 card. Permanent virtual circuits (PVCs) are setup between the MGX
and the edge router, and all packets are sent across these PVCs regardless of their destination. The router
is responsible for extracting the IP address and correctly routing the cells. For reliability, VISM supports
two independent STM-1 interfaces each connected to a separate router, and each with its own PVC—one
is designated the primary and one the secondary.
The Cisco Multiservice Packet Network Solution also supports the VISM-PR, a new generation VISM
with an additional G.723.1 codec, and a higher density daughter card that provides increased DSP
capacity for full support of eight E1s with codecs G.726 and G.729ab.
See Table 2-1 for configuration rules for the VISM, VISM-PR, and PXM cards supported in the Cisco
Multiservice Packet Network Solution.
72749
Exhaust Plenum
Fan Tray
Fan Tray
Inlet Plenum
28"
(16 RU)
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