Operating Principles
6
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. 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 device connected to the T1/R1
terminals - the 3G3070 switches the connected telephone device to the wireless network. After waiting
between 30 and 40 seconds, it checks the landline for one of the following:
• If the landline has been restored, the 3G3070 switches the connected device back to the landline,
OR
• If the landline is still down, the 3G3070 continues the simulation until the landline is restored. The
3G3070 will not switch during ongoing calls.
NOTE: When the landline is down, the 3G3070 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, how-
ever, be able to dial out over the 3G3070.
Panel Transmission Monitoring (PTM)
The 3G3070 can monitor the panel’s attempts to communicate with the central station. If it determines
that the panel is having difficulty, it switches the line to the wireless network. This feature is only active
when the 3G3070 is configured as a back up communicator. This feature is in addition to the regular
line voltage detection.
The 3G3070 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 (or Contact ID kiss-off) is sent from the receiver.
Once the conditions for a failed attempt are met, the 3G3070 connects the panel to the wireless
network to communicate the events. When the 3G3070 switches the line it stays in this mode until the
panel hangs up. On the next event the 3G3070 restarts the error detection sequence before switching.
The 3G3070 performs this sequence on any phone number that is detected on the line. Specific central
station phone numbers can be programmed into the 3G3070 if desired. Up to four, 20-digit numbers
can be added. If programmed, the 3G3070 will only look for Contact ID kiss-off after these numbers are
dialed.
NOTE: The number programmed in the 3G3070 must be the same as the number dialed by the
panel (i.e. if the panel requires a ‘9’ to dial on the phone line, a ‘9’ must also be included in the
3G3070 programming).
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.
Wireless Communications Sequence
• When an alarm is triggered, the control panel goes off-hook.
• The 3G3070 asserts a dial tone.
• 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.
• The 3G3070 detects the DTMF dialing and stops dial tone.
NOTE: The 3G3070 is unable to decode pulse dialing.
• The 3G3070 sends the required Contact ID dual-tone handshake to the panel.
• After receiving the handshake, the control panel transmits an alarm message in Contact ID format.
• The 3G3070 decodes and transforms the Contact ID digits into an IP packet and sends it to the
central station receiver over the wireless network.
• The central station receiver acknowledges the alarm and sends a command to the 3G3070 to gen-
erate the corresponding 1400Hz Kiss-off signal for a minimum of 800msec.
After the 3G3070 generates a Kiss-off signal, it sends the next alarm or, if no further alarms need to be
sent, the control panel goes on-hook.
Inputs
The 3G3070 has four inputs that can be used to trigger specific communications. These events will
transmit using Contact ID format with Inputs 1-4 reporting as [991] to [994] respectively.
Default settings are:
INPUT 1- FIRE
INPUT 3 - BURGLARY
INPUT 2 - PANIC ALARM
INPUT 4 - SYSTEM TROUBLE
Summary of Contents for 3G3070
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