Ground Start; Relay Installation; Phone Monitor Select Jumper; D928 Dual Phone Line Switcher - Radionics D9412G Operation And Installation Manual

6.11

Ground Start

Some telephone systems require a momentary ground input to initiate dial tone. To interface with a ground start
system, insert a D136 Plug-in Relay into the GND START socket and set the Phone Monitor Select jumper to the
GND START position.
Ground start not for use in NFPA applications. You cannot use ground start telephone systems for NFPA
Central Station Protective Signaling or Remote Station applications.
Note: Terminal 10 must be connected to an earth ground in order for ground start phone systems to operate properly on
the D9412G/D7412G.

6.11.1 Relay Installation

Power down the system before inserting the D136 relay into the GND START socket. The relay socket is in the
lower left corner as shown in Figure 7 . The plug-in relay is shorter than the socket it plugs into. It can be installed in
either the left or right end of the socket.
Don't rely on relay labeling: Don't rely on the labelling to install D136 relays. Check for the side with three pins.
The three pins go on the top side on the socket.
Incorrect insertion does not damage the relay or the panel, however the related circuits do not function properly. A
ground start relay must not be inserted if the ground start jumper is in the loop start position (see below).

6.11.2 Phone Monitor Select Jumper

The Phone Monitor Select jumper is above the TELCO
connector point at the lower left corner of the panel. Set it in
the ground start position. See Figure 10 .
6.12

D928 Dual Phone Line Switcher

6.12.1 Description

The optional D928 Dual Phone Line Switcher allows the panel
to transmit reports over two separate phone lines. The panel
monitors both lines. If a signal is generated and the panel
senses that a line is bad, then it will attempt to use the other
phone line to send the message. If trouble is detected, the
panel keeps the faulty phone line in memory.
Set the ring count above 2 on answering machines: The
panel's RAM Line Monitor feature may not operate correctly if
an answering machine with a ring count of less than two rings
is connected to a phone line used by the D928 Module.

6.12.2 Operation

See Phone in the D9412G/D7412G Program Entry Guide for phone supervision and reporting options. Set the Two
Phone Lines prompt to YES to use the D928.
When the D928 is installed, the panel will alternate between Phone Line 1 and Phone Line 2 to send its first report.
For example, on day one the panel will attempt to first communicate on Phone Line 1. On day two, the panel will
switch and attempt to communicate on Phone Line 2.
Note 1: Any time the panel is reset or powered down/up, the next reported event will always attempt to call out on Phone
Line 1 first.
Note 2: If Phone Line 2 is not in service on "Day 2," the panel will switch to the Primary Phone Line to send the report.
With the D928 Dual Phone Line Switcher installed, the panel uses two phone lines, primary and secondary, to dial
up to four phone numbers.
When using a Primary and Backup Device within a Route Group #, the panel makes two attempts on the primary
phone line using the Primary Device # as programmed. If these two attempts fail, the panel switches to the
secondary phone line using the Backup Device # as programmed. This pattern continues for a total of ten
attempts. After ten unsuccessful attempts, the panel generates a Comm Fail event for the given Route Group #.
© 2002 Radionics
D9412G/D7412G Operation & Installation Guide
Page 35
D9412G/D7412G
Telephone Connections
GROUND FAULT DETECT
Loop Start
Position
Ground Start
Position

Figure 10: Phone Monitor Select

Enabled
Disabled
PHONE MONITOR SELE
LOOP
GND
GROUND START
Requires
Relay # D136 in
Ground
Start Socket
43488D