Nortel Networks Circuit Card Manual

A SERVICE OF

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Page 735 of 906

Circuit Card Description and Installation

744

NTAK20 Clock Controller daughterboard

Contents

This section contains information on the following topics:

Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 735

Physical description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 738

Functional description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 739

Introduction

Digital trunking requires synchronized clocking so that a shift in one clock

source results in an equivalent shift in all parts of the network.

Synchronization is accomplished with an NTAK20 clock controller

daughterboard in each MG 1000S that contains a digital trunk card.

The NTAK20 clock controller daughterboard mounts directly on the

following cards:

• NTAK09 1.5Mb DTI/PRI

• NTBK50 2.0 Mb PRI

• NTRB21 DTI/PRI/DCH TMDI

• NTBK22 MISP

• NT6D70 SILC

• NT6D71 UILC