E1-F Interface Overview; F1-F Interface Features Supported By The Ar1200 - Huawei AR1200 series Configuration Manual

Huawei AR1200 Series Enterprise Routers
Configuration Guide - Interface Management

8.1 E1-F Interface Overview

This section describes the concepts of E1-F interfaces.
Unchannelized, Fractional Channelized, and Channelized Modes
An E1 physical interface can work in the following modes:
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Introduction to E1-F Interfaces
An E1-F interface is an E1 interface working in fractional channelized mode. It is a simplified
CE1/PRI interface. If E1 access does not need multiple channel sets or the ISDN PRI function,
using CE1/PRI interfaces wastes resources. To reduce costs, E1-F interfaces can be used in this
E1 access scenario.
An E1-F interface works in either of the following modes:
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In either unframed mode or framed mode, an E1-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 and
Internetwork Packet Exchange (IPX).

8.2 F1-F Interface Features Supported by the AR1200

This section describes E1-F interface physical attributes supported by the AR1200.
Physical Attributes of an E1-F Interface
Physical attributes that can be configured on an E1-F interface vary according to the working
mode of the E1-F interface:
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Clock Mode
To exchange data correctly, communicating parties must work in clock synchronization state.
Issue 01 (2012-04-20)
Unchannelized mode: The interface functions as a synchronous serial interface without
timeslot bundle.
Fractional channelized mode: An interface has only one channel, which contains one or
more timeslots.
Channelized mode: An interface can have multiple channels. Each channel contains one or
more timeslots.
In unframed mode, an E1-F interface works at a rate of 2048 kbit/s without timeslot bundle.
In framed mode, an E1-F interface is divided into 32 timeslots, which are numbered 0 to
31. Timeslot 0 transmits frame alignment signals. Any random group of timeslots 1 to 31
can be bundled into a channel. The rate of an E1-F interface is n x 64 kbit/s, in which n is
the number of timeslots bundled into a channel.
When an E1-F interface works in framed mode, you can configure the clock mode, frame
format, line idle code, interframe filling tag, and remote alarm indication (RAI).
When an E1-F interface works in unframed mode, you can configure the clock mode, line
idle code, interframe filling tag, and alarm indication signal (AIS).
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