Carrier Access BROADway System 770-0125-AB - Manual (Page 28)

2-12 BROADway - Release 4.00
Installation
Cabling the Alarm Ports
! Alarm generation #1 and #2 (alarm outputs)—These are used to generate an alarm from the
BROADway chassis to an external unit, such as an alarm siren, aisle alarm lights, alarm
telemetry systems, and so forth.
The ALARMS port is a female DB15 port. The following table describes the pinout of the ALARMS
port. The contacts closures for alarm output ports are in the normal state when no alarm is present in the
system.
Using the ALARMS port, you can do either or both:
! Connect none, one, or two external sources to alarm sense #1 and #2 to indicate when an alarm
is coming from the external source.
! Connect none, one, or two external units to the alarm generation #1 and #2 to tell the external
units when an alarm has occurred on the BROADway system.
Alarm Input Sensing
The ALARMS port provides two separate circuits to detect when an alarm is generated from an external
source. The circuit will sense an alarm condition when an external +5V potential is placed across pins
11 and 12 (ALMSNS1) or pins 9 and 10 (ALMSNS2). These pins are isolated from the BROADway
chassis. If an external voltage is not readily available, a 5V reference and ground are supplied on pins
13 and 15 and can be looped back onto pins 9 and 10 or 11 and 12, respectively, using the relay contacts.
Pin Name
1 normally open alarm generation #1
(interpreted as a Critical/Major alarm)
2 common
3 normally closed
4 normally open alarm generation #2
(interpreted as a Minor alarm)
5 common
6 normally closed
7, 8 not used
9 ALMSNS2N alarm sense #2
(can be configured for Critical, Major, or MInor)
10 ALMSNS2P
11 ALMSNS1N alarm sense #1
(can be configured for Critical, Major, or MInor)
12 ALMSNS1P
13 Ground
14 not used
15 +5V DC reference voltage