D-MBR 3707-3708 PS NFPA CLASS A SIGNAL BOOSTER
PRODUCT DESCRIPTION AND USER’S MANUAL
www.cobham.com/wireless
Date: 17-Jan-16
Cobham Wireless – Coverage
Page | 34 Rev. 1.1 Doc. No.00060CDUM
4.4.5 Charger Alarm Connections
The Charger supports three dry contact alarms that are connected to the Fire Department Control
Box:
• AC Input Fail
• Low Battery Capacity
• Charge Fail
NOTE: AC Input Fail can also be connected to the Booster External Alarm connector.
Figure 4-6. Charger Connections Architecture
4.4.5.1 Alarm Dry Contact Output Restrictions
• Maximum switching voltage: 220 VDC, 125 VAC
• Maximum switching current: 2A
4.4.5.2 External Alarm Input Restrictions
• Maximum repetitive reverse voltage: 28 V
• Impedance load: 470 Ohm
“0” - 0V
“1” - 3.8V - 28V
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