Nortel DMS-500 - Page 8

vi Contents
297–1001–122 Standard 06.01 August 1999
OAS Version 2 Enhanced Alarm System 4-1
EAS features 4-1
EAS hardware and alarm indication devices 4-2
Office alarm unit 4-2
MTM alarm system circuits 4-4
Alarm cross-connect unit panel 4-4
Audible alarms 4-4
Visual alarm indications and manual controls 4-5
ACD panel with common audible alarm 4-6
Alarm display panel 4-7
Exit alarm panel 4-8
Equipment aisle visual alarms 4-9
Alarm extension circuits 4-9
Power distribution frame upgrades 4-10
Office Alarm System features 4-10
Low Power Alarm system 5-1
Office alarm system 5-1
Low Power Alarm system 5-2
Low Power Alarm System features 5-2
Low Power Alarm system components 5-3
Alarm and control circuits 6-1
Alarms 6-1
Office alarm unit alarms 6-1
Dead system alarm (DSA) 6-1
FSP/MSP alarms 6-5
Power distribution center (PDC) alarms 6-6
Low voltage and power loss alarm circuits 6-6
Low battery voltage detection circuit 6-6
Low power alarm system 6-7
A and B feed loss detection circuit 6-8
Remote alarm contacts 6-8
Audible alarm reset 6-8
Trunk test center (TTC) alarms 6-9
Test line alarm 6-9
Trunk group alarm 6-9
Trunk test center night alarm transfer 6-10
Remote alarm transfer 6-10
Dead system alarm sending 6-11
Alarm grouping 6-11
Alarm power supplies 6-12
OAS Version 1 6-12
OAS Version 2 6-13
Loop closure 6-13
Local talk line circuit 6-13
OAS Version 1 6-14
OAS Version 2 6-14
Data loop system 6-14
Alarm sending and checking system 6-15