Crystal Vision
Control and Status monitoring
Power level
Displays one of the following depending on the received power level:
‘OVERLOAD’, ‘HIGH’, ‘GOOD’, ‘LOW’, ‘TOO LOW’.
‘OVERLOAD’ or ‘HIGH’ may cause the receiver to saturate with poor or
no video output. In extreme cases the receiver may even be damaged –
consider using an optical attenuator or a longer fibre cable.
‘TOO LOW’ or ‘LOW’ may be the result of dirty optical connectors – if in
doubt, clean. Excessive fibre cable runs will also cause these warnings.
Although transmission distances of up to 50km is possible with single
mode fibre, this distance is dependent on minimal attenuation from
junctions etc. Multi-mode fibre installations can expect considerably
shorter transmission distances. Single-mode fibre, or any single-mode
components should never be used downstream of multi-mode fibre.
Enable
Enable fibre optic output if FOP-VF or FIO-VF module fitted.
Level
warning
On if the laser is producing low output power. This indicates that the
laser has failed and should be replaced immediately.
Bias
warning
On if the laser bias current has risen above a threshold which indicates
imminent failure of the device. The laser should be replaced as soon as
possible.
UP-DOWN-VF User Manual R1.1
28
23 June 2017
