D9412GV4/D7412GV4/D7212GV4 | Installation and Operation Guide | 7.0 Telephone Connections
Bosch Security Systems, Inc. | 3/12 | F01U266054-01 35
When using a primary and a backup device within
a Route Group #, the control panel makes two
attempts on the primary telephone line using the
Primary Device # as programmed. If these two
attempts fail, the control panel switches to the
secondary telephone line using the Backup Device
# as programmed. This pattern continues for a
total of ten attempts. After ten unsuccessful
attempts, the control panel generates a Comm
Fail event for the given Route Group #.
Figure 11: D928 Dual Phone Line Switcher
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+
4
6
8
10
1
2
3
5
7
9
11
1 - Connect to ACCESSORY CONNECTOR with
ribbon cable.
2 - Green to Terminal 1
3 - Black to Terminal 9
4 - AC Power LED (green)
5 - Phone jack to primary phone line
6 - Primary Fail LED (yellow)
7 - Phone jack to secondary phone line
8 - Secondary Fail LED (yellow)
9 - Phone jack to telco connector
10 - Communications Fail LED (yellow)
11 - Buzzer
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