Comcast 1310nm TX, Руководство пользователя

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1310nm TX
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of RF signal
deteriorates.
2. The RF signal input of
the optical transmitter
is too high; beyond the
device AGC
control
range, results in
deterioration of the
intermodulation index.
3. The intermodulation
index of RF signal input
of
the optical
transmitter itself is poor
2. Check the input level
of
the optical
transmitter RF signal,
and adjust to the device
required input range.
(RF signal input level
should be 72--
88dBμV).
3. Check the
intermodulation index
of the RF signal input of
the optical transmitter
and make appropriate
adjustments.
After initial startup, the
image of the optical
contact
point has
obvious noises.
1. The received optical
power of the optical
contact point is not high
enough,
results in
decrease of C/N.
2. The RF signal level
input of the optical
transmitter is too low;
make
modulation
degree of the laser is
not enough.
3. The C/N index of
system link signal is too
low.
1. Recover received
optical power of the
optical contact point by
cleaning the active fiber
connector or. Specific
operation methods see
“Clean and
maintenance methods
of
optical fiber
connector”.
2. Check the RF signal
level input of the optical
transmitter and adjust
to the device required
input
range. (72--
88dBμV). When the
input channel number
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