Mircom TX3-CX-1NP - Three Lobby Control Unit Configuration; Figure 20 Dual Lobby Control Units

42 TX3 Telephone Access System Installation and Operation Manual Version 5.4
LT-969 Copyright 2019
TX3 System
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.
Figure 20. Dual Lobby Control Units
3.4 Three Lobby Control Unit Configuration
Figure 21 shows a configuration with many Lobby Control Units connected to
many phone lines using combined ADC and NSL connection types. Line 1 and
Line 2 connect to NSL Control Units while Line 3 connects to a dedicated phone
line.
Line1
NSL
Control
Unit
1 2 3
4 5 6
7 8 9

* 0 # i
T/R
Line1
Telephone outlet
Central office line
1 2 3
4 5 6
7 8 9

* 0 # i
1 2 3
4 5 6
7 8 9

* 0 # i
Line1
1 2 3
4 5 6
7 8 9

* 0 # i
Line1
OR
RS-485 bus
(optional)
RS-485 bus
(optional)
Lobby
control
unit 1
Lobby
control
unit 2
Lobby
control
unit 1
Lobby
control
unit 2