Hi,
In this section, we describe common methods for troubleshooting typical hardware faults.
6.1 Power Supply Failures
6.1.1 A Device Fails to Be Powered On
Fault Description
The SYS indicator of a device is off.
Possible Causes
Power Supply Mode | Possible Cause |
|---|---|
Power supply using a power module |
|
PoE power supply |
|
Troubleshooting Procedure
Power Supply Mode | Troubleshooting Procedure |
|---|---|
Power supply using a power module |
|
PoE power supply |
|
NOTE:6.2 Interface Faults
6.2.1 An Optical Interface Cannot Turn Up
Fault Description
After an optical interface is connected to a remote device through an optical fiber, its LINK indicator is off.
Possible Causes
The optical fiber is faulty.
The optical module on the optical interface cannot meet the requirements.
Troubleshooting Procedure
Replace the optical fiber and optical module and check whether the optical interface can turn Up. Ensure that the optical module meets the following requirements.
Determine optical module attributes.
The transmission distance of an optical module is 10 km, 15 km, 20 km, 40 km, or 80 km. The optical modules with a longer transmission distance have a higher transmit power. If an optical module with a long transmission distance is used for short-distance transmission, the optical interface cannot turn Up because the transmit power is too high. The high transmit power may even burn the receiver of the remote optical module. To reduce the transmit power in this situation, use an optical attenuator between the optical module and optical fiber.
Optical modules with different speeds are available, for example, 155 Mbit/s, 622 Mbit/s, and 1.25 Gbit/s. You must use an optical module with the same speed as the optical interface to ensure efficient optical transmission.
The optical module has passed Huawei certification.
The transmission speed of the optical module is the same as the interface speed.
Check whether the wavelength of the optical module is the same as that of the remote optical module.
The transmission distance of the optical module is suitable for the actual distance between the two devices.
NOTE:
If the interface remains Down, contact technical support personnel.
