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Section 6: Operating Principles
Section 6: Operating Principles
6.1 Simulated Landline Mode
The simulated landline provides the alarm control panel (with dialer interface) with a back up line in the event of PSTN line trouble.
Note:
The LE4000 must be programmed as a back-up communicator for Simulated Landline Mode to operate.
If the voltage on the landline terminals (TIP/RNG) drops below 2.8V for a period of between 10 seconds and 45 seconds - depending
on the alarm control panel connected to the T1/R1 terminals- the LE4000 switches the connected telephone device to the cellular net-
work. After waiting between 30 and 40 seconds, it checks the landline for one of the following:
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If the landline has been restored, the LE4000 switches the connected device back to the landline, OR
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If the landline is still down, the LE4000 continues the simulation until the landline is restored. The LE4000 will not switch dur-
ing ongoing calls.
Note:
When the landline is down, the LE4000 provides a dial tone to any device connected to T1 and R1, including any telephones on
the premises. The phones on the premises will not, however, be able to dial out over the LE4000.
6.2 Panel Transmission Monitoring (PTM)
The LE4000 can also monitor the panel’s attempt to communicate with the central station. If it determines that the panel is having dif-
ficulty, it switches the line to the cellular network. This feature is only active when the LE4000 is configured as a back up com-
municator. This feature is in addition to the regular line voltage detection.
The LE4000 monitors the phone line for four consecutive failed attempts within a 12-minute window. A failed attempt is assumed to
have occurred when a line seizure takes place during dialing (either the alarm panel or the customer telephone), but no 1400Hz tone
(Contact ID kiss-off) is sent from the receiver.
Once the conditions for a failed attempt are met, the LE4000 connects the panel to the cellular network to communicate the events.
When the LE4000 switches the line it stays in this mode until the panel hangs up. On the next event the LE4000 restarts the error
detection sequence before switching.
The LE4000 performs this sequence on any phone number that is detected on the line. Specific central station phone numbers can be
programmed into the LE4000 if desired. The phone number programmed in the LE4000 must match the number dialed by the panel
exactly. Up to four, 20-digit numbers can be added to your profile at Connect 24. If programmed, the LE4000 will only look for a
Contact ID kiss-off after these numbers are dialed. A Telephone Line Monitoring trouble (PGM output activation and/or reporting
code if applicable) is also activated and/or transmitted when the PTM is activated. A restoral is sent at the end of the call.
6.3
Wireless
Communications Sequence
When an alarm is triggered:
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The control panel goes off-hook.
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The LE4000 asserts a dial tone.
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The Control panel dials the number of the central station. Ensure that the alarm panel inserts a minimum one second pause, or
has Dial Tone Search enabled before dialing the number.
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The LE4000 detects the DTMF dialing and stops dial tone.
Note:
The LE4000 is unable to decode pulse dialing.
