Dual Lobby Control Units; Figure 13 Dual Lobby Control Units - Mircom TX3 Series Installation And Operation Manual

3.3

Dual Lobby Control Units

Figure 13 shows a dual entry application for either an NSL type or ADC
connection type. The phone line from either the NSL control unit or an ADC
dedicated phone line is shared by both Lobby Control Units.
The Lobby Control Unit senses whether the line in use. If one of the Lobby
Control Units is in use and the user tries to make a call, the other lobby indicates
that the line is in use.
The RS-485 network connection is optional and is only required if the user
decides to connect a PC configurator on one of the panels to configure and/or
monitor both systems.
NSL
Control
Line1
Lobby
control
unit 1
1 2 3
4 5 6
7 8 9
* 0 # i
Figure 13.
TX3 Telephone Access System Installation and Operation Manual
32
Unit
T/R
Line1
Lobby
control
unit 2
1 2 3
4 5 6
7 8 9
* 0 # i
RS-485 bus
(optional)
Dual Lobby Control Units
Telephone outlet
Central office line
Line1
Lobby
control
unit 1
OR
1 2 3
4 5 6
7 8 9
* 0 # i
RS-485 bus
TX3 System
Line1
Lobby
control
unit 2
1 2 3
4 5 6
7 8 9
* 0 # i
(optional)