SMA-8018 Serial Monitoring Amplifier
1-5
Operation
The only customer-operated controls are GAIN (RV4) and EQ (RV2) for the analog video output.
The GAIN control has been factory-adjusted for correct output level and should not need adjustment in
the field. The front edge of the module has several LED indicators, which show the current status of the
amplifier. The meaning of the LED indicators when lit is as follows:
INPUT STATUS
Green
When lit means that the input signal is suitable for achieving error-free performance.
That is, it is within the capability of the cable equalizer and re-clocking circuit to
restore the signal.
Red
This indicates that the input signal is too low or absent. In some circumstances the
signal may still be restored correctly but the circuits will be working close to the limit
of their capability and reliability cannot be assured.
MONITOR ERROR
This indicator identifies if there is a problem with the input signal or in the analog conversion
section of the card. There are three states for this indication.
STEADY RED
The signal is present, but not the proper format (e.g. Composite
Digital). (During this condition, the SMA 8018 provides an
internally generated black burst signal to the analog outputs.)
FLASHING RED
There is no input signal.
50% duty cycle
(During this condition the SMA 8018 provides an internally
generated black burst signal to the analog outputs.)
FLASHING RED
The monitoring amp is in the "TEST" mode.
10% duty cycle
(In this mode the SMA 8018 provides an internally generated
color bar signal to the analog outputs.)
