Cisco AS5800 Handbuch - Seite 4
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CT1 and CE1 Trunk Card Overview
Channelized ingress interfaces reside on either CT1 or CE1 trunk
cards that are installed in the Cisco 5814 dial shelf. A CT1 or CE1 trunk
card contains all necessary functionality to terminate incoming
telephone calls. The channelized trunk card is configured in the factory
for either T1 or E1 framing, depending on your order.
shows the CT1 and CE1 trunk card components.
Figure 3 CT1 and CE1 Trunk Card
The CT1 and CE1 trunk cards perform the following functions:
•
Terminate up to 12 T1 or 12 E1 lines
The CE1 trunk card provides physical termination for up to 12 E1
lines and connects to an external network termination (NT1)
device, while the CT1 trunk card provides physical termination for
up to 12 T1/Primary Rate Interface (PRI) lines, includes channel
service units (CSUs), and connects directly to the telco network.
•
Demultiplex DS0s
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 or CE1 trunk card
on Highlevel Data Link Control (HDLC) controllers, and analog
modemoriginated 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 timesensitive signaling
Each individual T1 or E1 port can be used as the system clocking