Comtech EF Data EQ90 Series - Manual (Page 60)

EQ90 Amplitude Equalizer Application Note
Rev. 2 A–3
A.3 Fault Monitor
The equalizer monitors the IF output signal level and power supplies for fault conditions.
These alarms are summed and reported to the rear panel monitor connector and front
panel status indicator(s).
Normally the equalizer is set to monitor the IF output signal level.
•
If no signal is present at the output of the unit, a sum fault will be generated.
The alarm detection circuitry will not detect the loss of a single carrier in a
multi-carrier environment.
•
If the equalizers composite output level falls below a factory preset threshold,
(-20 dBm), the equalizer will generate a sum fault condition.
•
If level monitoring is not desired because output signal levels are too low, a
switch located on the equalizer module can bypass the output detection feature.
•
When level detection is bypassed, the equalizer fault circuitry will only monitor
the equalizers internal power supply.
A.4 Monitor Interface
The monitor interface of the equalizer is designed to facilitate 1:1 and 1:N redundancy
implementations when using an equalizer.
The equalizer will interface directly to V90 and V901 frequency converters via a 9-pin
female, female D ribbon cable. The channel monitor port of the equalizer is connected to
the J6 rear panel connection on these converters.
This connection places the sum fail relay contacts of the equalizer in parallel with the
fault relay contacts of the converter. V90 and V901 converters can report the fault status
of an equalizer, connected to J6, to remote M&C facilities.
The equalizer also will directly interface to the Automatic Redundancy Controller (ARC)
via a 9-pin male, female D ribbon cable. The channel monitor port of the equalizer is
connected to one of the rear panel input connections, J2, or J3, of the ARC.