When customers use optical modules, they will more or less encounter a variety of fault problems, such as whether the optical module model is selected correctly, whether the jumper is used correctly and other common problems. Customers have the ability to judge and have clear solutions, but for some fault problems, such as abnormal transmission, many customers do not know how to check and solve them.
Troubleshooting and solution of transmission type
This kind of fault mainly includes port not up, port status up but not receiving or sending messages, frequent up or down port and CRC errors. The specific troubleshooting methods and solutions are as follows:
Port not up
Taking 10g sfp+/xfp optical module as an example, when optical port of optical module cannot be connected with other equipment up, it can be checked from the following five aspects:
Step 1: check whether the rate and duplex mode of both ports match - execute the "show interface brief" command to view, if not, configure the port speed and duplex mode through the speed command and duplex command.
Step 2: check whether the device port matches the speed and duplex mode of the optical module -- execute the "show interface brief" command to check. If not, configure the speed and duplex mode of the port through the speed command and duplex command.
Step 3: check whether the ports at both ends are normal - test whether the ports at both ends can be up by loopback. On the 10g SFP + port of the single board, use the 10g SFP + direct cable (suitable for short distance connection, or use the SFP + optical module and optical fiber jumper) for interconnection. On the 10g XFP port, use the XFP optical module and optical fiber to test to see whether the port can be up. If it can be up, it means that the opposite port is abnormal; if it cannot be up, it means that the local port is abnormal. You can check whether the fault is solved by replacing the local port and the opposite port.
Step 4: check whether the optical module is normal - mainly to check whether the parameters such as DDM, optical power, wavelength and distance are normal. If not, replace the optical module matching the optical interface.
1.DDM information - check whether the parameters are normal through the "show interfaces transparent detail" command. If there is an alarm, it means that the optical module is faulty or the optical module does not match the optical interface type.
2.Optical power - use the optical power meter to test whether the light-emitting power of the port is in the normal range and stable.
3.Wavelength / distance - check whether the wavelength, distance, etc. of the optical modules at both ends are consistent through the "show transmitter interface" command.
The fifth step is to check whether the optical fiber is normal - for example, the single-mode SFP + optical module matches the single-mode optical fiber, and the multi-mode SFP + optical module matches the multi-mode optical fiber. If it does not match, the matching optical fiber can be replaced immediately.
Port status is up, but message is not received or sent
When the port status is up, but the message cannot be received or sent, troubleshooting is carried out from the following three aspects:
Step 1: check the port message statistics. Check whether the port status of both ends is up all the time, and check whether the message statistics at both ends increase.
Step 2: check whether port configuration affects the receiving of messages. First, check whether the network configuration has been made, check whether the configuration is correct, delete all the items if necessary, and then test whether the problem is solved; secondly, check whether the MTU value of port is 1500, if it is greater than 1500, modify the configuration.
Step 3: check whether the port and link cutoff are normal. Replace the connection port, connect it to other ports to see if there is the same phenomenon, if still faulty, replace the optical module.
Port up or down frequently
When the optical port of the optical module is up or down frequently, first confirm whether the optical module is abnormal. Check the alarm information of the optical module to check the problems of the optical modules at both ends and the connecting optical fiber. For the optical module supporting digital diagnosis function, check the DDM information to confirm whether the optical power of the optical module is at the critical value. If the transmitting optical power is at the critical value, replace the optical fiber and optical module For cross validation, if the received optical power is at a critical value, check the opposite end optical module and connecting optical fiber. When this happens to the electrical port optical module, try to set the rate duplex.
Troubleshooting and solutions for abnormal information reading
Display not supported
DDM is not supported
When the system prompts that the optical module does not support digital diagnosis, you can query whether the digital diagnosis function is supported or not through the command "show transitional interfaces detail", or directly contact the supplier to inquire whether the optical module supports digital diagnosis function. If the module supports digital diagnosis function, but can not solve the problem, contact the technical support personnel of the supplier directly for help.
DDM exception
When the interface installed with optical module fails to work normally, troubleshooting can be carried out according to the following three steps:
Step 1: check the alarm information of the optical module. If there is a receiving problem in the alarm information, it is generally caused by the opposite port, optical fiber or transfer equipment; if there is a transmission problem or abnormal current and voltage, it is necessary to check the local port.
Step 2: check whether the receiving and transmitting optical power of the optical module is normal. The "show interfaces transparent detail" command can be used to check whether the received / transmitted optical power of the optical module is normal, and whether other parameters are within the threshold range; or the real-time query can be used to check whether the optical power, temperature, voltage, bias current and other parameters are normal.
Step 3: check whether the optical module itself fails or the adjacent equipment or the intermediate link fails. The port, optical module, etc. can be replaced to carry out cross validation.
Hardware troubleshooting and Solutions
Hardware troubleshooting mainly starts from the optical module itself. Firstly, it is necessary to ensure that the quality of the optical module purchased is certified. If not, the quality can not be guaranteed, so it is recommended not to use the optical module. Secondly, check whether the golden finger of the optical module is damaged, and replace the optical module if it is damaged. Finally, check whether the interface is polluted or damaged. If the interface is polluted and clean, it is recommended to replace it if it is damaged.
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