Black Box AC455A-TX-R2 - Manual (Page 18)

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FIBER LINK
Table 4-1 (continued). Diagnostic LED Indicators
Indicator Display What It Means
VIDEO (TX) Green Video coax input to link is good. Note that
even a totally black screen is a valid video
signal.
Red Video coax input to link is not good. Check
the camera and the coax into the link.
VIDEO (RX) Green Valid video signal received. Note that even a
totally black screen is a valid video signal.
Red No video signal received. Check the camera
and coax. Check the LEVEL/LOSS
indicator. If the LEVEL/LOSS indicator is
green, check the video indicator on the TX
unit.
COMMAND Green Indicates PTZ command transmission
(>250 mV).
Dark No activity, or command being transmitted is
<250 mV.
RESPONSE Green Indicates response from camera >250 mV.
Dark No response from camera or signal is
<250 mV, may indicate a problem with the
camera. This function is not commonly
available in all systems.
SYNC Green Indicates transmission of Genlock
Synchronization signals (>2V), where
applicable.
Dark No Genlock signal being sent, or signal is
<2V.