No relevant resource is found in the selected language.

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies. Read our privacy policy>Search

Reminder

To have a better experience, please upgrade your IE browser.

upgrade

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.
Rate and give feedback:
Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
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).

Translation
Download
Updated: 2019-03-06

Document ID: EDOC1100069331

Views: 21064

Downloads: 93

Average rating:
This Document Applies to these Products
Related Documents
Related Version
Share
Previous Next