NSL Relay Cabinet Installation and Wiring
Version 5.4 TX3 Telephone Access System Installation and Operation Manual 73
LT-969 Copyright 2019
5.2.2 2012 NSL Relay
The NSL Backplane board contains up to eight 2012 NSL Relay Boards. Each
2012 NSL Relay Board has 12 relays, allowing for a total of 96 relays.
5.2.3 NSL Expanders
NSL expanders plug into the NSL Backplane Board connectors and consist of:
• TX3-8EC NSL Eight Relay Card Backplane Expander
• TX3-16EC NSL 16 Relay Card Backplane Expander
Extension cables provide connections between adjacent enclosures using the
expansion connectors. See section 5.3 on page 75 for a description of the NSL
Backplane Board connectors.
The TX3-8EC NSL Eight Relay Backplane Expander and the TX3-16EC
NSL 16 Relay Backplane Expander are housed in their own cabinet and can be
connected with two cables to provide an additional capacity for 8 or 16 relay
boards respectively.