Cisco Systems AS5800 manual Each CT3 trunk card performs the following functions

Chapter 3 Channelized T3 Trunk Card

CT3 Trunk Card Overview

Figure 3-1 CT3 Trunk Card

	PWR MAINT
	FCPU
	HCPU
MONITOR	#
	RALM
LALM	NLOOP

	PWR MAINT
	FCPU
	HCPU
MONITOR	#
	RALM
LALM	NLOOP

	T3LOOP
T3EN	AIS
LOS	OOF
FERF

Receive BNC connector RCVR

Transmit BNC connector XMTR

	T3LOOP
T3EN	AIS
LOS	OOF
FERF

Transmit DSx1 connector	TX	(OUT)
Receive DSx1 connector	RX		(IN)
			CHANNELIZED T3

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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.

Cisco AS5800 Universal Access Server Dial Shelf Card Guide

3-2 78-7097-03