Installation
EST3 Installation and Service Manual 5.39
telephone lines. If the site has ground-start lines, two separate
loop-start lines must be installed for the dialer.
To determine the type of telephone company line, disconnect the
line pair and connect the lines to a test meter.
If the line is equipped for loop-start, the meter should read 48 to
52 Vdc between the lines.
If the line is equipped for ground-start, the meter will read 0 Vdc
between the lines, 48 to 52 Vdc between one line and ground,
and 0 Vdc between the other line and ground.
Note: AT&T Horizon PBX systems and some Type 75 systems
are of the loop-start type. AT&T Dimension PBX systems and
other Type 75 systems are equipped for ground-start.
If this installation is for a certified fire alarm system or a burglar
alarm system in compliance with NFPA 72, the telephone
company line must be of the called party disconnect type (also
called timed-release disconnect). This feature permits the
communication module to seize the line and dial out, even when
the telephone company line is in use.
To determine the whether the telephone line supports called
party disconnect
1. Have someone telephone the premises from the outside.
2. Hang up the telephone that received the call, but have the
individual who placed the call remain on the line.
3. After 40 seconds, pick up the called telephone again.
• If you are no longer connected to the caller
• If the caller is still on the line
Loading configuration data
After installing the 3-MODCOM, use the SDU network
downloading process to load the configuration data for the
3-MODCOM.
The SDU provides a report that lists all CMS codes that can be
transmitted from the 3-MODCOM. Give this report to the
appropriate CMS.
Testing transmission
After the CMS has programmed the central monitoring database,
perform transmission tests as required by the AHJ and CMS.
Note: Transmission failures are latched at the panel. This means
that you must reset the panel in order to clear them.
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