4
、
Mode Selection Switch
Optical receiver’s rear panel is equipped with a mode selector switch. The switch
sets the status to determine the receiver’s working mode—— RFoG (high sensitivity)
mode, or Normal mode.
·RFoG Low power receive pattern, the received optical power range is
-20~-5dBm
·Normal Normal power receive pattern, the received optical power range is
-5~0dBm, with AGC function.
5
、
Button
The front panel has 3 buttons:
“▲”: turns the page in the initial state; increases output power/ decreases the
amount of attenuation in the channel status, 1dB step, the minimum amount of
attenuation is 0dB.
“▼”: turns the page in the initial state; decreases output power/ increases the
amount of attenuation, 1dB step, the max amount of attenuation is 30dB.
“
TR R 7 8 0 0 O PTICA L R ETU R N R ECEIV ER
L
”: the enter key, turns the page
6
、
User Note:
The laser receiver is precise opto-electronic equipment, the user should follow
the operating standards strictly when using and operating. Improper operation may
cause laser receiver damage or personal injury.
Laser is harmful to eyes, to avoid retina damage, never look into the optical
output port directly.
The optical connector and fiber jumpers performance has significant impact on
the laser transmission link index, MX4RR –LI low power return optical receiver’s
optical input port adopts high-quality SC/ APC connectors, you must choose the same
type high quality active optical fiber connector in order to ensure the system stability
and reliability.
7
、
Fault Handling
1) If the he measured value of the optical power, which is transmitted from the
transmitter to the receiver, measured by optical power meter is low. If this
occurs, you may first inspect the optical transmitter’s output power. If the
optical transmitter’s output power is normal, then a fault may exist in the
transmission link. Fiber optics, fusion and related active optical fiber
equipment.
2) If optical output power is within proper operating window of the transmitter and
calculated loss budget, but the receiver output RF signal level is below the
normal value. Common issues may prevent the optical link from operating
properly, the transmitter output optical connector may be polluted/dirty or
poorly spliced, the receiver input connector is polluted and so on. These will
cause the optical receiver power to be too low. Check the optical transmission
link carefully.
3) If the input optical level is good, the transmitter is working properly, but the
receiver’s output RF signal level is higher than the normal value. Common
reasons for such breakdown may be the receiver input optical power is too
