Installation
EST3 Installation and Service Manual
5.28
The remote programs, ACDB and KDC, use passwords defined
during 3-SDU programming to gain access to the 3-MODCOM.
At the start of the downloading process, a connection is
established between the modem portion of the 3-MODCOM
module and the ACDB or KDC program. Connection is over the
telephone network.
The 3-MODCOM module receives data and transfers it to the
CPU. The data is then routed via the 3-SAC to the CRC and
KPDISP modules on the SAC bus. The data is stored in the
nonvolatile flash memory chips of these devices.
Monitoring and diagnostics
Each line has a voltage monitor for detecting loss of telephone
line during on-hook condition, and a current monitor for
detecting the loss of telephone line and telephone line usage
during off-hook conditions. Optical coupler circuits are used for
these monitors.
Two red LEDs (DS1 and DS2) annunciate line ringing, in use,
and fault conditions. States and explanations for DS1 and DS2
are given in the “Service and troubleshooting” chapter.
Equipment
3-MODCOM – Modem Communicator
The 3-MODCOM connects the EST3 system to the switched
telephone network. The 3-MODCOM module is a single rail
module with two eight-position modular jacks for connecting
two loop-start lines. The 3-MODCOM module provides a
control / display layer and space for a future expansion insert
card.
The 3-MODCOM can support 255 accounts. It can communicate
with 80 receivers in any of the following protocols:
• Contact ID
• SIA DCS
• SIA P2 (3/1 Pulse Format)
• SIA P3 (4/2 Pulse Format)
The 3-MODCOM is supplied with two seven-foot cables (P/N
360137). These are eight-conductor, flat telephone cables, with
eight-position modular plugs on both ends. One end of the cable
plugs into the 3-MODCOM. The other end plugs into an RJ-31X
jack.
You must obtain the RJ-31X jack locally, and wire it to the
telephone lines as indicated on the 3-MODCOM installation
sheet.
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