Page 2645349D © 2002 Radionics
D6412/D4412 Installation Guide
D6412/D4412
6.7 Phone Line Fault
The panel has a circuit that tests the phone line for voltage. The normal voltage on a telephone line is
approximately 48 VDC (24 VDC for some phone systems). The phone line monitor senses trouble when the
voltage drops low enough (between 1 and 3 volts).
If the panel senses trouble, it starts a phone line trouble timer. The timer continues to run as long as the panel
senses trouble. It resets to zero when the panel senses a normal line. If the timer reaches 40 seconds, it begins
a phone line trouble response. Programming determines what the response is. See Phone Line Fault Response
Options in the D6412/D4412 Program Entry Guide (P/N: 45351).
Bad line may test OK: The telephone line test circuit uses the voltage level to test the status of the phone line.
In some instances, a given telephone line may be out of service without affecting the voltage on the line. The
phone line monitor can not recognize this trouble condition.
6.8 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. The panel provides “called party disconnect” by adding a 35 second
on hook interval to the dial tone detect function. If the panel does not detect a dial tone in seven seconds, it puts
the phone line on hook for 35 seconds to activate “called party disconnect,” goes off hook and begins a seven-
second dial tone detect. If no dial tone is detected, the panel dials the number anyway. Each time the number is
dialed, the panel records this as an attempt.
6.9 Communication Failure
The panel routes reports to two routing destinations. Each of the destinations can be programmed with two
phone numbers. See Routing Dialing Tables in Appendix A: D6412/D4412 Program Entry Guide (P/N: 45351).
The numbers in [ ] are the numbers assigned to panel events. For more panel event information, see Appendix
B in the D6412/D4412 Program Entry Guide.
The Routing Dialing tables show the circumstances when Communication Failure Events are created. When a
Comm Fail occurs, the D6412/D4412 responds as follows:
1. Clear (dump) the initiating report and any pending reports from the dialer buffer for the destination where
the Comm Fail event occurred.
2. Create a Comm Fail [69] or AltComm Comm Fail [70] report that includes the Destination Number
(1 or 2). Modem IIIa² reports report the destination number as a Route Group (RG). The Alternate Comm
Fail report is used when an alternate communications path is used (SAFECOM for example).
3. The Comm Fail, Comm Restoral [71], Alternate Comm Restore [72] reports follow the System
Status Reports routing.
4. If the Comm Fail occurred on Destination 1 and System Status Reports routing is set to Destination 2 or
set to Destination 2 on Destination 1 fail, then send Comm Fail report.
5. If the Comm Fail occurred on Destination 1 and System Status Reports routing is set to Destination 1 then
send a Comm Restore report with the next report for destination 1.
6. If the Comm Fail occurred on Destination 2 and System Status Reports routing is set to Destination 1, then
send Comm Fail report.
7. If the Comm Fail occurred on Destination 2 and System Status Reports routing is set to Destination 2 then
send a Comm Restore report with the next report for destination 2.
8. If a Comm Fail report is sent successfully to the other destination, a Comm Restore event should be sent
when there is a successful communication on the failed destination.
6.10 Ground Start
Some telephone systems require a momentary ground input to initiate a dial tone. To interface with a ground
start system you must wire PO 1 as shown in Figure 8. PO 1 Jumper must be open.
Program PO 1 for Ground Start. See the D6412/D4412 Program Entry Guide, Outputs section (P/N: 45351) for
programming instructions.
PO 2, 3, and 4 can be used to interface with a ground start system using either a D133 Relay Module or a D134
Dual Relay Module.
Telephone Connections
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