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Cisco AS5800 Universal Access Server Dial Shelf Card Guide
78-7097-03 0A
Chapter4 Double-Density Modem Card
CT1/CE1 Trunk Card Overview
The double-density modem card performs the following functions:
• Converts PCM bitstreams to digital data.
DMMs perform the modulation and demodulation of the analog bitstreams. Each DMM comprises
12 digital modems. There are 12 DMMs on each DMM modem card; thus, each card can support a
maximum of 144 modems.
• Forwards converted and packetized data to the dial shelf main processor, which examines the data
and forwards it to the router shelf. From the router shelf, the data is routed to the external network.
• Supports all modem standards (such as V.34 and V.42bis) and features, including dial-in and
dial-out.
• Supports online insertion and removal (OIR), a feature that allows you to remove and replace
CT1/CE1 trunk cards while the system is operating. CT1/CE1 trunk cards can be removed without
disrupting the operation of other modem cards and their associated calls. If a CT1/CE1 trunk card
is removed while the system is operating, connections or current calls on that card are dropped. Calls
being handled by other cards, however, are not affected.
CT1/CE1 trunk cards can be installed in slots numbered 0 to 11 on the dial shelf backplane. However,
we recommend that you install modem cards in dial shelf slots 2 to 11 and reserve slots 0 and 1 for trunk
cards. (Trunk cards are required for call termination and can only operate in slots 0 to 5.)
Figure 4-2 shows a fully-configured Cisco 5814 dial shelf with ten modem cards installed.