Installation
EST3 Installation and Service Manual
5.36
Send:
a command that sends a message to a CMS through the
3-MODCOM.
Installation
Caution: Prior to installation, remove power from the rail.
To install the 3-MODCOM, you’ll need to follow these general
steps:
1. Arrange suitable telephone company lines and services.
2. Install the 3-MODCOM on the rail.
3. Connect the 3-MODCOM to the telephone company lines.
4. Download configuration data from the 3-SDU.
5. Make test transmissions to verify proper operation.
Requirements for telephone lines
3-MODCOM dialers can be used for most applications that use
telephone lines, the exceptions being:
• The central station telephone number cannot be dialed
directly (using access numbers and area code where
necessary) without operator interception of the call
• Multiparty service (a party line) exists
• Operator assistance is required to complete a telephone call
and a foreign exchange cannot be introduced
• Connection is not established within 38 seconds following
completion of dialing
The 3-MODCOM dialer circuit is compatible with any switched
telephone network that employs direct dialing (local) and Direct
Distance Dialing (DDD), without operator interception of the
call.
Operator interception occurs in some areas where message
billing is not completely automatic. Where operator interception
is involved, you must obtain a foreign exchange (FX) connection
must from the central station exchange to the exchange serving
the customer. The FX provides a local number for calling the
central station without toll billing. A WATS or ground-start line
connection must not be used for this purpose because the line
cannot be supervised.
The 3-MODCOM includes a feature that prevents jamming by
an incoming telephone call. The feature is based on a telephone
service option referred to as called party disconnect. This option
lets the receiver of a call disconnect by hanging up the telephone
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