Bosch Appliances D9412GV2 manual 7.11D928 Dual Phone Line Switcher, Description, Operation

D9412GV2/D7412GV2 Operation and Installation Guide 7.0 Telephone Connections

7.11D928 Dual Phone Line Switcher

7.11.1 Description

The optional D928 Dual Phone Line Switcher allows the control panel to send reports over two separate telephone lines. The control panel monitors both lines. If a line generates a signal and the control panel senses that a line is bad, the control panel attempts to use the other telephone line to send the message. If trouble is detected, the control panel keeps the faulty telephone line in memory.

Set the Ring Count above 2 on Answering Machines: The control panel’s RPS line monitor feature might not operate correctly if an answering machine with a ring count of less than two rings is connected to a telephone line used by the D928 Module.

7.11.2 Operation

Refer to Phone in the D9412GV2/D7412GV2 Program Entry Guide (P/N: F01U003636) for telephone supervision and reporting options. To use the D928, set the Two Phone Lines prompt to Yes.

When the D928 is installed, the control panel alternates between Phone Line 1 and Phone Line 2 to send its first report. For example, on day one, the control panel first attempts to communicate on Phone Line 1. On day two, the control panel switches and attempts to communicate on Phone Line 2.

Any time the control panel resets or is powered down or up, the next reported event always attempts to call out on Phone Line 1 first.

If Phone Line 2 is not in service on “Day 2”, the control panel switches to the primary phone line to send the report.

With the D928 Dual Phone Line Switcher installed, the control panel uses two telephone lines (primary and secondary) to dial up to four telephone numbers.

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 9: D928 Dual Phone Line Switcher

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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

Bosch Security Systems, Inc. 5/05 F01U003641B 29