**1. Power Light is Off**
A power failure may occur. Check if the power supply is properly connected and functioning. Ensure that the power cable is securely plugged in and that there are no issues with the electrical outlet or power source.
**2. Link Light is Off**
Possible faults include:
(a) Check if the fiber optic cable is broken or disconnected.
(b) Inspect the optical fiber for excessive wear or damage that could exceed the device’s receiving range.
(c) Ensure that the fiber optic interface is correctly connected. The local TX should be connected to the remote RX, and the remote TX should be connected to the local RX.
(d) Verify that the fiber connector is fully inserted into the device interface. Confirm that the jumper type matches the device interface, the device type matches the fiber, and the transmission distance is within the specified range.
**3. Circuit Link Light is Off**
Possible causes:
(a) Check if the network cable is damaged or open-circuited.
(b) Confirm that the cable type matches the device requirements—crossover cables for network cards and routers, straight-through cables for switches and hubs.
(c) Ensure that the transmission rate settings on both devices are consistent.
**4. Severe Packet Loss on the Network**
Possible issues:
(a) Mismatch between the transceiver's electrical port and the network device interface, or mismatched duplex modes at both ends.
(b) Problems with the twisted pair cable or the RJ-45 connector. Test the cable for integrity.
(c) Issues with the fiber connection, such as incorrect alignment of the jumper with the device interface, or mismatched pigtail and coupler types.
**5. Fiber Transceivers Cannot Communicate**
Common causes:
(a) Fiber polarity is reversed—TX and RX ports are swapped.
(b) The RJ45 connector is not properly connected to the external device. Pay attention to the correct wiring (straight or crossover).
(c) Incompatible optical fiber interfaces (e.g., APC vs. PC ferrules). This issue is common in 100M transceivers with photoelectric control functions. Non-optoelectronically controlled transceivers are less affected.
**6. Time-off Phenomenon (Communication Interruption)**
Possible reasons:
(a) Excessive optical path attenuation. Use an optical power meter to measure the received optical power. If it’s within 1–2 dB of the receiving sensitivity range, the optical path is likely faulty.
(b) A faulty switch may be causing the issue. Replace the switch with a PC and connect both transceivers directly to the PC. Perform a PING test. If communication is restored, the switch is the problem.
(c) The transceiver itself may be faulty. Connect both ends directly to a PC and transfer a large file (e.g., 100MB). If the transfer speed is extremely slow (taking over 15 minutes), the transceiver is likely faulty.
**7. Communication Crash After Some Time**
This phenomenon is often caused by a switch. Switches perform CRC error detection and length checks. While most errors are discarded, some undetected packets can accumulate in the buffer. When the buffer becomes full, the switch may crash. Restarting the transceiver or the switch usually restores communication, leading users to mistakenly blame the transceiver.
**8. Transceiver Testing Method**
If you suspect a transceiver issue, perform the following tests:
a) **Near-end Test**: Ping between two computers. If successful, the transceiver is likely working. If not, the transceiver may be faulty.
b) **Remote Test**: Ping between the two ends. If not possible, check the optical path and ensure the transmit/receive power levels are within acceptable ranges. A successful ping confirms proper optical connectivity and suggests the issue lies with the switch.
c) **Fault Location Test**: Connect both ends to a switch and perform a PING test. If no issues are found, the fault is likely in the other switch.
Lvl Wooden Bed Slats,Packing Furniture Scaffolding,Pine Veneer Lvl, Door Core Material Lvl
RILICO , https://www.rilico.com