74 (119) Telephone Access System Installation and Operation Manual Version 3.7
LT-969 Copyright January 2017
NSL Relay Cabinet Installation and Wiring
P5. Expansion to the NSL Controller back-plane.
P6. Not used.
5.3.2 Switches
SW1. Turns the unit’s power ON and OFF for servicing, or to re-start the unit.
SW2. Not used.
5.3.3 Jumpers
JW1. JW1 is used for updating firmware and is normally open.
JW2. JW2 is used for updating firmware and is normally open.
All other jumpers are not used.
5.3.4 Telephone Line
Each NSL control unit provides a single telephone line connection to the Lobby
Control Unit. See Figure 41 and Figure 42.
Each Lobby Control Unit panel can use any one of the five telephone lines on the
Lobby Control Unit Main Controller Board to communicate to an ADC
telephone system or to an NSL relay control unit.
There are many possibilities for connecting Entry Control panels and NSL
control units, but each main Lobby Control Unit requires one individual
telephone line to each NSL control unit.
Lobby Control Units connect to the NSL and control units through telephone
lines. Telephone lines are not connected to expansion units.
Expansion relay control units do not require an individual telephone line.
5.3.5 Ring Signal
The NSL control unit provides a 45 Vrms ring signal on REN5 with a line length
of 503 m (1650 feet). The minimal ring signal level for North America is 40
Vrms.
To Next Page
Loading...
