Installation   
  EST3 Installation and Service Manual 
5.26
3-MODCOM Modem Communicator module 
Features 
The 3-MODCOM Modem Communicator is a local rail module 
that supports telephone line communication. It combines the 
functions of a dialer and modem in a single module. 
The module has two eight-position modular jacks for connecting 
to telephone lines. It includes two red LEDs (DS1 and DS2) to 
annunciate line ringing and data exchange. The module accepts a 
control / display layer and has provision for a future expansion 
module. 
A nonvolatile, flash memory chip stores customization data that 
includes account information, user identifiers, telephone 
numbers, and other dialing details. 
The 3-MODCOMP is identical to the 3-MODCOM, but supports 
remote paging using the Telocator Alphanumeric Protocol 
(TAP). The 3-MODCOMP remote paging feature is 
supplemental and is not supervised. 
Both versions of the module are equipped with a modem that is 
Bell 103 and V.32bis compliant. The modem includes support 
for these protocols: 
• Contact ID 
• SIA DCS 
•  SIA P2 (3/1 pulse format) 
•  SIA P3 (4/2 pulse format) 
•  TAP (3-MODCOMP only) 
Several 3-MODCOMs (up to ten) can be installed in a network 
for increased reliability. These can be configured to provide 
dynamic failover operation. 
You can program the 3-MODCOM in any of the following 
configurations: 
• One-line dialer 
• Two-line dialer 
• Modem 
•  Modem and one-line dialer 
•  Modem and two-line dialer 
The dialer circuit is compatible with pulse dialing or touch-tone 
(DTMF) dialing. The module can be configured to detect and 
answer any of these ring types: 
• Any ring 
• Normal ring 
•  Distinct ring 2 (type II) 
•  Distinct ring 3 (type III)