Mechanisms Supported By The E1 Interface - Alcatel-Lucent OmniAccess 700 Cli Configuration Manual

Release versions: 2.2, 2.2-r02, 2.3

Hide thumbs Also See for OmniAccess 700:

Table of Contents

Left running head:

Chapter name (automatic)

T1E1 Line Card

UPPORTED BY THE

In order to provide a reliable and accurate service, the E1 interface supports

several mechanisms for synchronization, error correction and detection,

management and performance messages and signaling.

These mechanisms and their way of operation are explained in the following

YNCHRONIZATION

To verify that the received bits are mapped to the correct channels, a

synchronization mechanism is activated. This mechanism is independent of any

clock, and does not synchronize the clocks. Clock recovery is achieved by the

shape of the signal.

The synchronization information is carried in the TS0 of every even frame. Such a

frame is called "Frame Alignment Signal (FAS)". An FAS carries the unique

pattern 0011011 (bits 1 - 7), that specifies the alignment of the frame.

Signaling mechanisms provide a wide range of functions and their protocol is

application specific. Two modes of signaling are employed, namely:

Common Channel Signaling (CCS) - In this mode of operation one or more

channels of 64 kbit/s are dedicated for signaling and the information carried in

them asynchronously serves all other channels. TS16 is usually used for this

Channel Associated Signaling (CAS) - In each Multiframe, each channel has a

predetermined frame. In this frame, half of TS16 is dedicated for this channel

signaling information.

Alcatel-Lucent

CLI Configuration Guide

Troubleshooting