Z-Light 6TX/16TX/26TX Intelligent Direct Modulated Optical Transmitter
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optical transmitter itself is
poor.
After initial startup, the video
image has noise.
1.
The received optical power is
not high enough, results in
decrease of C/N.
2.
The RF signal level input is
too low; making the
modulation of the laser
insufficient.
3.
The C/N index of system link
signal is too low.
1.
Clean the active fiber connectors.
For specific methods see section
6.1
2.
Check the RF signal level input
and adjust to the device required
input range. (72--88dBμV). When
the input channel number is less
than 15, set to the MGC control
mode.
3.
Use a spectrum analyzer to check
the system link C/N and make
appropriate adjustments. Make
sure the system link signal C/N
﹥
51dB.
After initial startup, the video
image has randomly appearing
noise or bright traces.
The RF input has open circuit
signal interference or strong
interference signal intrusions.
1.
Check if there is a strong
interference signal source; reorient
the receiving equipment and/or
reroute cabling, if possible, to
avoid the influence of strong
interference signal sources.
2.
Check the RF cables into the
transmitter, the cable shielding or
the RF connector shielding and/or
if the grounding is not good.
3.
Close any equipment enclosure
doors tightly to ensure the best
shielding; if possible
After initial startup, the video
image on several channels has
noise.
The C/N indexes of these channels
are too low.
Check the C/N of these channels
signals and make appropriate
adjustments.
