Mircom TX3-200-4U-C - Multiple Lobby Control Unit Setups

TX3 System
TX3 Telephone Access System Installation and Operation Manual 33
3.4 Three Lobby Control Unit Configuration
Figure 14 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.
When Lobby Control Unit 1 is using line 1 and Lobby Control Unit 2 also wants
to use line1, which is busy, then a line busy message displays on Lobby Control
Unit 2.
Figure 14. Multiple Lobby Control Units to Multiple Lines
1 2 3
4 5 6
7 8 9

* 0 # i
1 2 3
4 5 6
7 8 9

* 0 # i
1 2 3
4 5 6
7 8 9

* 0 # i
NSL
Control
Unit
NSL
Control
Unit
Line1
Line2
Line3
Telephone outlet
Central office line
RS-485
bus
RS-485 from
previous unit
RS-485 to
next unit
Lobby
control
unit 1
Lobby
control
unit 2
Lobby
control
unit 3
T/R
T/R
T/R