64 TX3 Telephone Access System Installation and Operation Manual
NSL Relay Cabinet Installation and Wiring
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 66 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.
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