Specifications

Configure a Channelized T3 Interface Processor

Configuring Serial Interfaces IC-79

Use Time Slot 16 for Data

By default, time slot 16 is used for signaling. It can also be used for data. To specify the use of time

slot 16 for data, use the following command in interface conﬁguration mode:

Specify a Clock Source

A G.703 interface can clock its transmitted data from either its internal clock or from a clock

recovered from the line’s receive data stream. By default, the interface uses the line’s receive data

stream. To control which clock is used, use the following command in interface conﬁguration mode:

Conﬁgure a Channelized T3 Interface Processor

The Channelized T3 Interface Processor (CT3IP) is available on Cisco 7500 series routers and

Cisco 7000 series routers with the 7000 Series Route Switch Processor (RSP7000) and 7000 Series

Chassis Interface (RSP7000CI). The Channelized T3 dual-wide port adapter (PA-CT3/4T1) can be

used in Cisco 7200 series routers.

Note Throughout this document are references to the CT3IP. However, the term CT3IP also applies

to the PA-CT3/4T1. Wherever you see a description of a feature of the CT3IP, the feature is also

available in the PA-CT3/4T1.

The CT3IP is a ﬁxed-conﬁguration interface processor based on the second-generation Versatile

Interface Processor (VIP2). The CT3 channelized port adapter (PA-CT3/4T1) is a dual-wide port

adapter. The CT3IP or PA-CT3/4T1 has four T1 connections via DB-15 connectors and one DS3

connection via BNC connectors. Each DS3 interface can provide up to 28 T1 channels (a single T3

group). Each channel is presented to the system as a serial interface that can be conﬁgured

individually. The CT3IP or PA-CT3/4T1 can transmit and receive data bidirectionally at the T1 rate

of 1.536 Mbps. The four T1 connections use 100-ohm twisted-pair serial cables to external channel

service units (CSUs) or to a MultiChannel Interface Processor (MIP) on the same router or on

another router. For wide-area networking, the CT3IP or PA-CT3/4T1 can function as a concentrator

for a remote site.

Note The VIP2-50 is the newest and fastest second-generation Versatile Interface Processor (VIP2)

available on Cisco 7500 series routers that use the Route Switch Processor (RSP), and on Cisco 7000

series routers with the 7000 Series Route Switch Processor (RSP7000) and 7000 Series Chassis

Interface (RSP7000CI). The VIP2-50 provides signiﬁcantly greater packet and program memory

space and increased distributed switching performance.

For more information on the VIP2-50, refer to the Second-Generation Versatile Interface Processor

(VIP2) Installation, Conﬁguration, and Maintenance publication.

Command Purpose

ts16 Specify that time slot 16 is used for data.

Command Purpose

clock source {line | internal | loop-timed} Specify the clock used for transmitted data.