Installation Guide

Litenna  Installation Guide Alarm Monitoring
Foxcom Wireless Proprietary Information Document No. 42-93-005-23D 29
Alarm Monitoring
The BU has a 25 pin D-type connector that is connected to 8 dry contact relays (B8U). Each
of the relays indicates the status of the link between the BU and one of the RHUs. This
capability provides the status of the optical communications. The relay connections on the 25
pin D-type connector can be connected directly to the BTS alarm relays and can be controlled
from the remote end.
In order to transmit the Litenna system as a “major alarm”, all dry contact pins need to be
connected in a serial (cascade) formation, for Normally Closed alarm.
All dry contacts need to be connected in parallel formation, for Normally Open alarm.
Table 5 - 25 Pin Alarm Pinouts
Pin Type of Alarm Port
1 Dry Contact 4 1
2 Dry Contact 4 2
3 Open Collector 4
4 Dry Contact 1 1
5 Dry Contact 1 2
6 Open Collector 1
7 Dry Contact 2 1
8 Dry Contact 2 2
9 Open Collector 2
10 Dry Contact 3 1
11 Dry Contact 3 2
12 Open Collector 3
13 Dry Contact 8 1
14 Dry Contact 8 2
15 Open Collector 8
16 Dry Contact 5 1
17 Dry Contact 5 2
18 Open Collector 5
19 Dry Contact 6 1
20 Dry Contact 6 2
21 Open Collector 6
22 Dry Contact 7 1
23 Dry Contact 7 2
24 Open Collector 7
25 - -