NSL Relay Cabinet Installation and Wiring
Version 5.4 TX3 Telephone Access System Installation and Operation Manual 75
LT-969 Copyright 2019
5.3 Wiring the TX3-NSL-8M Main Controller Board
The TX3-NSL-8M NSL Main Controller Board has both ribbon cable sockets
and screw terminals.
Attention: High voltages are present on this board during the ringing of suite
telephones.
Figure 43 shows the general layout of the TX3-NSL-8M Main Controller board
components.
Figure 43. TX3-NSL-8M Main Controller Board
5.3.1 Connectors
USB. Computer connection for firmware download.
P1 and P2. Not used.
P3. Not used.
SW1
OFF
USB
16V AC
IN
JW1
JW2
R
T
Telephone Line
from Lobby Pane
Main Controller
Board
R
T
R
T
Res.
Co.
P4
P5
P3
P6
X3-NSL-8M Relay Control Unit
Expansion Connectors
TX3-NSL-8M Main Controller Board