Called Party Disconnect; Communication Failure; D928 Dual Phone Line Switcher; Description - Bosch D9412GV4 Installation And System Reference Manual

D9412GV4/D7412GV4 v2.03 | Installation and System Reference Guide | 7.0 Telephone Connections
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7.9

Called Party Disconnect

Telephone companies provide "called party
disconnect" to allow the called party to terminate
a call. The called party must go on hook (hang
up) for a fixed interval before a dial tone is
available for a new call. This interval varies with
telephone company equipment. Control panel
firmware allows for "called party disconnect" by
adding a 35-sec, "on hook" interval to the dial
tone detect function. If the control panel does
not detect a dial tone in 7 sec, it puts the
telephone line on hook for 35 sec to activate
"called party disconnect," goes off hook, and
begins a seven-second dial tone detect.
If no dial tone is detected, the control panel dials
the number anyway. Each time the number is
dialed, the control panel records this as an
attempt.

7.10 Communication Failure

If a backup route is configured and the first two
attempts to reach the receiver over the phone
line fail, the system switches to the backup route.
When it switches to the backup route, a COMM
TROUBLE PH # event is sent, and the event that
triggered the telephone call to the central station
follows.
After ten unsuccessful attempts to reach the
receiver, the control panel enters communication
failure. The control panel clears any reports
queued for the failed route and a COMM FAIL #
event is generated and display at the keypads. A
trouble sounder can be programmed to
annunciate at the keypads.
One hour after the COMM FAIL # is generated,
the control panel attempts to send a restoration
event. If a communication failure still occurs, the
keypad trouble sounds again.
If the D928 Dual Phone Line Switcher is used, the
control panel makes a total of ten attempts
before entering communication failure.
Enhanced Communication
The control panels can send events over the SDI
Bus through a DX4020 Network Interface Module
(NIM) or over the SDI2 bus through a B426/B420
NIM. For more information on the enhanced
communications capabilities, refer to the Control
Panels (D9412GV4/D7412GV4 v2.03) Program
Entry Guide (P/N: F01U265459).
Bosch Security Systems, Inc. | 7/16 | F01U265457-09

7.11 D928 Dual Phone Line Switcher

7.11.1 Description

The optional D928 Dual Phone Line Switcher
allows the D9412GV4 and D7412GV4 Control
Panels 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.
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 section of
the Control Panels (D9412GV4/D7412GV4 v2.03)
Program Entry Guide (P/N: F01U265459) 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.
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