D9412GV2/D7412GV2 | Operation and Installation Guide | 7.0 Telephone Connections
32 Bosch Security Systems, Inc. | 7/09 | F01U003641-04
Enhanced Communication
The D9412GV2 and D7412GV2 Control Panels can
send events over the SDI Bus to a DX4020 or
D9133TTL-E Network Interface Module (NIM). For
more information on the enhanced communications
capabilities, refer to GV2AUX in the
D9412GV2/D7412GV2 Program Entry Guide
(P/N: F01U003636).
7.11 D928 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. If a telephone line is not within the
operating range, 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. For troubleshooting information, refer
to the D9412GV2/D7412GV2 Troubleshooting Guide
(P/N: F01U011024).
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 and Phone Parameters in the
GV2MAIN section of 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 #.
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