Nortel Networks 553-3001-211 manual NTBK51 Downloadable D-channel Handler daughterboard, Contents

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NTBK51 Downloadable D-channel

Handler daughterboard

Contents

This section contains information on the following topics:

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 773

Physical description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 774

Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 775

Download operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 777

Introduction

The NTBK51 daughterboard provides Downloadable D-channel Handler (DDCH) interfaces based on the Multipurpose Serial Data Link (MSDL). The DDCH provides a single purpose full-duplex serial port capable of downloading the D-channel application and base software into the card.

The NTBK51 provides the following features and functions:

•ISDN D-channel related protocol

•Selftest

•Loopback

•D-channel loadware including:

—management and maintenance

—LAPD- software for data link layer processing

Circuit Card Description and Installation