Three Lobby Control Unit Configuration; Figure 8. Dual Lobby Control Units - Mircom TX3 Series Installation And Operation Manual

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
Unit
Line1
Lobby
control
unit 1
1 2 3
4 5 6
7 8 9
* 0 # i
Figure 8.
3.4

Three Lobby Control Unit Configuration

Figure 9 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.
Lobby Control Units 1, 2 and 3 can make simultaneous calls as long as a line is not
in use by another Lobby Control Unit. For example, if Lobby Control Unit 1 uses
line1, Lobby Control Unit 2 can use Line 2 and Lobby Control Unit 3 can use
line 3.
Telephone Access System Installation and Operation Manual
32 (112)
LT-969 Copyright 2012
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
(optional)
TX3 System
Line1
Lobby
control
unit 2
1 2 3
4 5 6
7 8 9
* 0 # i
Version 1.6