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Cisco AS5800 Universal Access Server Dial Shelf Card Guide
78-7097-03
Chapter 3 Channelized T3 Trunk Card
CT3 Trunk Card Overview
Figure 3-1 CT3 Trunk Card
Each CT3 trunk card performs the following functions:
• Provides physical termination for as many as 672 sessions.
• Provides digital termination for as many as 256 DS0 connections (calls) using onboard High-Level
Data Link Control (HDLC) controllers. Note that the D-channel of a PRI consumes a single channel
of an HDLC controller.
• Removes framing and embedded signaling bits (or inserts them, depending on the direction of the
flow), demultiplexing the calls. The framer CPU sends the data stream to onboard time-division
multiplexing (TDM) resources, which break out each call and pass each call to an appropriate call
termination resource. Digital or ISDN-originated calls are terminated onboard the CT3 trunk card
on HDLC controllers.
Note Each D-channel consumes an HDLC controller.
Analog modem-originated calls are passed over the dial shelf backplane TDM bus to an available
modem resource. The system software controls modem and HDLC resource management.
• Responds to time-sensitive signaling. Each CT3 trunk card can supply two clocks from any two of
its 28 ports. You can assign priorities to these clocks or accept the default values assigned by the
software.
12125
CHANNELIZED T3
PWR
MAINT
FCPU
HCPU
MONITOR #
RALM
LALM
NLOOP
AIS
T3LOOP
T3EN
LOS
FERF
OOF
RCVR
XMTR
TX (OUT)
RX (IN)
AIS
T3LOOP
T3EN
LOS
FERF
OOF
PWR
MAINT
FCPU
HCPU
MONITOR #
RALM
LALM
NLOOP
Receive BNC connector
Transmit BNC connector
Receive DSx1 connector
Transmit DSx1 connector