Chapter 5: Installation
EST3X Technical Reference Manual 135
• If the 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 type of telephone company line:
1. 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.
To determine 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 to determine whether
the caller has been disconnected.
Downloading the configuration database
After installing the 3-MODCOM and configuring its database in the 3-SDU,
download the database. Refer to “Downloading a database” on page 67 for
download instructions.
Note: For UL listed or FM approved installations, you must configure the
3-MODCOM as a two-line dialer and both lines must have supervision (line-cut
detection) selected.
Testing the transmission
The 3-SDU provides a report that lists all CMS codes that can be transmitted
from the 3-MODCOM. Give this report to the appropriate CMS.
After the CMS has programmed the central monitoring database, perform
transmission tests as required by the local authority having jurisdiction (AHJ) and
CMS.
Note: Transmission failures are latched at the panel. You must reset the panel in
order to clear them.
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