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Cisco Multiservice Packet Network Solution Overview
OL-3025-01
Chapter 2 Solution Components
Call Agent
As a TDM switch, iMSS-4040 incorporates all the features of a Class 4 switch, such as the powerful and
scalable circuit switching fabric and call-control functions. In addition, the iMSS-4040 can operate as a
Class 5 switch, accepting ISDN primary rate access (PRA) coming from business customers (for
example, private automatic branch exchange [PABXs]) as well as plain old telephone service (POTS)
and ISDN basic rate access (BRA) subscribers via V5.1 and V5.2 interfaces.
Platform Components
The iMSS consists of the following main components or telephony modules: Optical Peripheral Module
(OPM), Interconnection Structure Module (ISM), Basic Service Handler (BSH), Virtual Termination
Call Handler (VTCH), and Operation and Maintenance Server (OMS). Each iMSS can include up to 100
of these modules.
Note The Protocol Handling Server (PHS) is not supported in releases 2.0 and 2.1 of the Cisco Multiservice
Packet Network Solution.
Optical Peripheral Module
The OPM is the key element of the iMSS call agent, providing the switch control and call handling, and
the synchronization and timing for the TDM line interfaces. The OPM consists of control processors, a
synchronization and timing unit (card identifier USTCON), a time slot switching matrix, four slots for
multiservice cards, and five slots for interface cards. See Figure 2-9 for the layout of the OPM.
The OPM is a fully redundant system with dual power supplies, fans, and switching matrix, and multiple
slots for hot-swappable cards.
Figure 2-9 OPM Front View
Two Main Control Processors (UELABI) work in hot-standby mode to control the internal OPM
elements and external communication devices and channels, although only one is in control at any one
time. Each processor card has a dual 10BaseT Ethernet card (UETBAK) for intermodule communication
and communication with the OMS. Similarly two Peripheral Control Processors (U32PCP) that work in
hot-standby mode handle the control channels.
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