Nortel Networks Video Gaming Accessories 553-3001-211 Manual De Usuario

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NTBK51 Downloadable D-channel 
Handler daughterboard
Contents
This section contains information on the following topics:
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