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After connecting the
network, the image of the
optical contact point has
obvious noises.
After connecting the
network, the images of
several optical contact
points randomly appear
obvious noises or bright
traces.
After connecting the
network, the images of
several optical contact
points appear one or two
horizontal bright traces.
After connecting the
network, the received
optical power of the optical
contact point is unstable
and has large continuous
change. The output RF
signal is unstable, too. But
the detected output optical
power of the optical
transmitter is normal.
1. The input optical power of the
optical receiver is not high enough,
results in the decrease of C/N.
2. The optical fiber active connector
or adapter of the optical receiver has
been polluted.
3. The RF signal level input the
optical transmitter is too low, make
modulation degree of the laser is not
enough.
4. The C/N index of system link
signal is too low.
The optical contact point has open
circuit signal interference or strong
interference signal intrusion.
Power supply AC ripple interference
because of the bad earth of equipment
or power supply.
The optical fiber active connector
types do not match, maybe the APC
type connect to PC type, make the
optical signal cannot normal
transmission.
The optical fiber active connector or
adapter may be polluted seriously or
the adapter has been damaged.
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1. Check the received optical power of the
optical contact point and make appropriate
adjustments to make it in the specified range.
2. Recover the received optical power of the
optical contact point by cleaning the optical
fiber connector or adapter etc methods.
Specific operation methods see "Clean and
maintenance method of the optical fiber
active connector".
3. Check the RF signal level input the optical
transmitter and adjust to the required input
range. (When the input channels number less
than 15, should higher than nominal value.)
4. Use a spectrum analyzer to check the
system link C/N and make appropriate
adjustments. Make sure the system link signal
C/N﹥51dB.
1. Check if there is strong interference signal
source; change the optical contact point
location if possible to avoid the influence of
strong interference signal source.
2. Check the cable lines of the optical contact
point, if there is shielding net or situation that
the RF connector shielding effect is not good.
3. Tightly closed the equipment enclosure to
ensure the shielding effect; if possible add
shielding cover to the optical contact point
and reliable grounding.
Check grounding situation of the equipment,
make sure that every equipment in the line
has been reliably grounding and the
grounding resistance must be﹤4Ω.
1. Check the type of optical fiber active
connector and adopt the APC type optical
fiber active connector to ensure the normal
transmission of optical signal.
2. Clean the polluted optical fiber active
connector or adapter. Specific operation
methods see "Clean and maintenance method
of the optical fiber active connector".
3. Replace the damaged adapter.
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