Nevion AAV-HD-XMUX - Manual (Page 21)

AAV-HD-XMUX(-T/R)/ AAV-SD-XMUX(-T/R) Rev. G
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5.2 GPI alarms
Only three alarms are present on the 8P8C Modular jack connector as four of the pins are
used for the RS422 data port.
The three alarms are:

Power present (negative logic)

Video signal lost

Laser failure
An active alarm condition means that the transistor is conducting.
The power present alarm should always be active during normal operation.