4000 Router Series Interface Configuration Guide

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Task Command

Display the status of an E1-F

interface.

display interface serial interface-number

Clear the controller counter of a

E1-F interface.

reset counters interface [ serial [ interface-number ] ]

Configuring a T1-F interface

Overview

T1-F interfaces, fractional T1 interfaces, are simplified CT1/PRI interfaces. They are a cost-effective

alternative to CT1/PRI interfaces where T1 access does not need multiple channel sets or ISDN PRI.

Compared with a CT1/PRI interface, a T1-F interface delivers these features:

• In framed mode, it can bind timeslots into only one channel set, but a CT1/PRI interface can group

and bundle timeslots randomly into multiple channel sets.

• It does not support PRI mode.

A T1 line is multiplexed from 24 channels. A T1 primary group frame DS1 (digital signal level-1)

comprises 24 DS0 (64 kbps) timeslots and 1 framing bit for synchronization, with each timeslot being 8

bits. Each primary group frame has 193 bits (24 × 8+1). As DS1 can transmit 8000 frames per second,

its transmission speed is 1544 kbps (193 × 8 kbps).

A T1-F interface can only operate in framed mode. Timeslots 1 through 24 on it can randomly form a

channel set. The rate of the interface is n × 64 kbps or n × 56 kbps and its logical features are the same

as those of a synchronous serial interface where you can configure PPP, FR, LAPB and X.25 at the data

link layer and IP at the network layer.

Configuration procedure

To configure a T1-F interface:

Step Command Remarks

1. Enter system view.

system-view N/A

2. Enter T1-F interface view.

interface serial interface-number N/A

3. (Optional.) Configure the

interface description.

description text

By default, the description of an

interface is interface-name

Interface.

4. Bundle timeslots on the

interface into a channel set.

ft1 timeslot-list range [ speed { 56k

| 64k } ]

By default, if no timeslot range is

specified, all timeslots are bundled

into one channel set.

The default timeslot speed is 64

kbps, and the default T1-F interface

speed is 1536 kbps.

5. Set the cable length and

attenuation.

ft1 cable { long decibel | short

length }

By default, the long 0db keyword

applies.