Cobalt Co9992-4ENC-4K-HEVC Software-Defined Broadcast Encoder - Manual (Page 85)

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Each of the ASI Port indicators can have the following values:

TX OK : The port is operating normally in transmit mode (ASI Output).

TX Overflow:
The connected bit rate is excessive. The Dashboard™ Card State will
be red and the Status LED in the front of the board will also be red. To correct this
problem, either reduce the connected bit rate, or increase the ASI output bit rate, or
configure the port in Automatic mode.
If this alarm is active, data is being dropped .

TX Unlocked: The port is in automatic bit rate, and there is no data rate coming to it.
Any downstream ASI receivers will lose lock. Dashboard™ Card State and the Status
LED will be red if there is a connection to this port.