Filter
Top Products
2-2
Cisco AS5800 Universal Access Server Dial Shelf Card Guide
78-7097-03 0A
Chapter 2 Channelized T1 or E1 Trunk Card
CT1 and CE1 Trunk Card Overview
The CT1 and CE1 trunk cards perform the following functions:
• Terminate as many as 12 T1 or 12 E1 lines
The CT1 trunk card provides physical termination for as many as 12 T1/Primary Rate Interface
(PRI) lines, includes channel service units (CSUs), and connects directly to the telco network. The
CE1 trunk card provides physical termination for as many as 12 E1 lines and connects to an external
network termination (NT1) device.
• Demultiplex calls
A framer removes framing and embedded signaling bits (or inserts them, depending on the direction
of the flow), and the framer CPU sends the data stream to onboard time-division multiplexing
(TDM) resources, which break out each call (DS0) and pass each call to an appropriate call
termination resource. Digital or ISDN-originated calls are terminated onboard the CT1/CE1 trunk
card on High-Level Data Link Control (HDLC) controllers, and 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.
• Respond to time-sensitive signaling
Each T1 or E1 port can be used as the system clocking reference. Each CT1/CE1 trunk card can
supply two clocks from any two of its 12 ports. You can assign priorities to these clocks or accept
the default values assigned by the software.
• Process counting information for performance monitoring
• Support online insertion and removal (OIR)
The CT1/CE1 trunk card supports OIR, a feature that allows you to remove and replace trunk cards
in the Cisco 5814 dial shelf while the system is operating, without disrupting other cards and their
associated calls. If you remove a trunk card while the system is operating, all calls associated with
the lines on that card are dropped. Calls being handled by other trunk or modem cards, however, are
not affected. For more information, see the “Busyout Command” section on page 1-1.
Figure 2-2 shows two CT1/CE1 trunk cards installed in a fully-configured Cisco 5814 dial shelf chassis.