Contents - Avaya Nortel Communication Server 1000 Reference

Chapter 34: NTBK51 Downloadable D-

Contents

This section contains information on the following topics:
Functional description
Physical description
Functional description
Download operation
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
- DCH interface
- Layer 3 preprocessor
Circuit Card Reference
channel Handler
daughterboard
on page 569
on page 562
on page 562
on page 564
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