SLOC spot monitoring

A system for transmitting video signals, comprising a camera-side modem configured to receive two signals from a video camera, each signal being representative of sequence of images captured by the camera, and further configured to transmit one of the two signals as a composite baseband video signal and to modulate and transmit the other signal as a passband video signal that does not overlap the baseband signal, wherein the camera-side modem includes:

• a mixer that combines the baseband and passband video signals to provide a transmission signal;
• a diplexer configured to transmit the transmission signal over a transmission line and to extract a received passband signal from the transmission line;
• and
• a detector that monitors the camera-side modem and generates an enable signal when the received passband signal is identified, wherein the detector monitors an estimate of mean square error in an equalizer, and wherein the enable signal is generated when the estimate exceeds a threshold value, and
• wherein the enable signal controls transmission of at least one of the baseband video signal and the passband video signal.

An automatically reconfigurable system for transmitting video signals, comprising:

• a modem configured to:
• receive a first signal and a second signal from a video camera, each of the first signal and the second signal being representative of a sequence of images captured by the camera;
• transmit the first signal as a composite baseband video signal on a cable;
• modulate and transmit the second signal as a passband video signal on the cable, wherein the passband video signal does not overlap the baseband video signal;
• receive a third signal from the cable, wherein the third signal is transmitted on the cable by a different modem;
• and
• cease transmission of at least one of the first signal and the second signal if degradation in the third signal is detected.