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CLI-based Configuration Guide - Interface Management

AR100, AR120, AR160, AR1200, AR2200, AR3200, and AR3600 V300R003

This document provides the basic concepts, configuration procedures, and configuration examples of the interfaces supported by the device.
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Overview of T1-F Interfaces

Overview of T1-F Interfaces

Introduction to T1-F Interfaces

If T1 access does not require multiple channels sets or ISDN PRI, using a CT1/PRI interface is a waste of resources. In this scenario, you can use a T1-F interface to provide the T1 access service. Compared with a CT1/PRI interface, a T1-F interface provides T1 access at a low cost.

A T1-F interface works only in framed mode. In this mode, a T1-F interface is divided into 24 timeslots, which are numbered 1 to 24. All the 24 timeslots can be bundled into a channel. The rate of a T1-F interface is n x 64 kbit/s or n x 56 kbit/s, in which n is the number of timeslots bundled into a channel. A T1-F interface is similar to a synchronous serial interface and supports link layer protocols such as the Point-to-Point Protocol (PPP), High-Level Data Link Control (HDLC), and Frame Relay (FR) and network protocols such as IP.

A T1-F interface differs from a CT1/PRI interface in the following aspects:

  • When working in framed mode, a T1-F interface allows timeslots to be bundled into only one channel, whereas a CT1/PRI interface allows timeslots to be randomly bundled into multiple channels.
  • A T1-F interface does not support the PRI mode.

Clock Mode

To exchange data correctly, communicating parties must have their clocks synchronized.

A T1-F interface works in either of the two clock modes:
  • Master clock mode (local clock mode): In this clock mode, a T1-F interface uses the local clock generated by the chip as the reference clock.
  • Slave clock mode (line clock mode): In this clock mode, a T1-F interface uses the line clock as the reference clock.

Generally, the interface at one end of a link works in master clock mode, and the interface at the other end works in slave clock mode.

Frame Format

A T1-F interface supports the following frame formats:
  • Extended super frame (ESF): consists of 24 frames that share the same frame alignment information and signaling information. Frames 6, 12, 18, and 24 are signaling frames.
  • Super frame (SF): consists of 12 frames that share the same frame alignment information and signaling information. Frame 6 and frame 12 are signaling frames.

Line Idle Code

The line idle code is the code sent over a timeslot that is not bundled to form a channel.

The router supports two line idle codes: 0x7e and 0xff.

Interframe Filling Tag

The interframe filling tag is the code sent when the timeslot bundled to form a logical channel does not send any service data.

The router supports two interframe filling tags: 0x7e and 0xff. On the router, you can set the minimum number of interframe filling tags.

RAI Detection

A remote alarm indication (RAI) alarm is sent to an upstream device after the router detects loss of frame (LoF) caused by clock asynchronization or loss of signal (LOS).

Updated: 2019-03-06

Document ID: EDOC1100069331

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