Installation
EST3 Installation and Service Manual 5.37
for a period of time, even if the caller stays on the line. The time
required for disconnect varies in different areas, but is usually
between 18 and 90 seconds. Called party disconnect is available
in most areas. To determine whether called party disconnect
control is available in the area to be served, consult the local
telephone company.
In areas not having called party disconnect, the 3-MODCOM
module is vulnerable to jamming by an incoming call. To
minimize the possibility of jamming, we recommend that the
customer order a separate, unlisted number for exclusive use of
the 3-MODCOM module. The customer should keep this
number confidential. In the case of the two-line dialer, two
premises telephone numbers would have to be busied by
incoming calls to jam the system.
Progressive anti-jamming measures would entail the use of one
unlisted telephone number, or two unlisted numbers for
maximum dialer integrity.
The 3-MODCOM must be connected to the incoming line ahead
of all connected equipment on that line, but just behind the
demarcation block. This puts the control unit telephone
connection in series, assuring that all telephones, answering
machines, and FAX machines are disconnected during dial-out
to the CMS. This requirement is necessary so the 3-MODCOM
dialer circuit can seize the line for its exclusive use in the event
of an alarm.
Do not use a telephone line that is considered essential for
conducting business at the site. Use a separate line for the
3-MODCOM. The dialer must be the first connection in line, and
it seizes the line and disconnects all other equipment when
making a call.
If the incoming lines to the protected premises involve a rotary
telephone line arrangement, make the connection to the line
having the highest number. This will create the least interference
with business lines.
Note: If connection will be made to a telephone company line
that is also used for normal business purposes, advise customer
that the telephone service will be disrupted for a few minutes
during the connection period.
In areas where the telephone company requires that their own
connector block be installed, it should be wired as per the USOC
RJ-31X or RJ-38X configuration. (The RJ-38X configuration is
identical to RJ-31X except for a jumper between 2 and 7 which
is used in some residential applications but is not used by the
3-MODCOM.)
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