Nortel DMS-250 - Page 8

vi Contents
297-2521-106 Standard 23.01 March 2001
TRAVER enhancements 2-13
Originations on PRA250 trunks 2-13
Datafill trace 2-14
D-channel handler 3-1
Introduction 3-1
Hardware configuration 3-1
Functionality 3-1
Installation 3-2
Loading the D-channel handler from the MAP terminal 3-3
Returning the D-channel handler to service 3-3
Checking the D-channel handler load name 3-3
Verification 3-3
Running internal continuity tests 3-3
Running the read-only memory tests 3-3
Running the external continuity test 3-3
Troubleshooting 3-4
Test equipment 3-4
PRI D-channel backup 3-5
Terminology 3-5
Background 3-5
Configuration for D-channel backup 3-5
MAP commands for D-channel maintenance 3-6
D-channel back-up interactions 3-6
Message structure and function 4-1
Message structure 4-1
Mandatory information elements 4-1
Protocol discriminator 4-1
Call Reference 4-2
Message Type 4-2
Other information elements 4-2
Bearer Capability 4-2
Call State 4-2
Called Party Number 4-2
Called Party Subaddress 4-2
Calling Party Number 4-2
Calling Party Subaddress 4-3
Cause 4-3
Change Status 4-3
Channel Identification 4-3
Congestion Level 4-4
Connected Number 4-4
Display 4-4
Facility 4-4
Generic Digits 4-4
Higher Layer Compatibility 4-4
Information Request 4-4
Lower Layer Compatibility 4-5
More Data 4-5
Network-Specific Facilities 4-5