Abnormal reading of optical module information – check message Statistics

The function of viewing message statistics: enter “show interface” in the command to view the wrong packets in and out of the port, and then make statistics to determine the growth of the volume, to judge the fault problem.

1) First, CEC, frame, and throttles error packets appear at the port entry direction, and the error count continues to increase. Solution: you can use instruments to test whether there is a fault in the link communication. If there is a fault, replace the network cable or optical fiber; You can also connect to other ports by replacing the network cable or optical fiber module. If the wrong package reappears after the port is replaced, it is regarded as a board port failure.

If the wrong package still occurs after changing to the normal port (the normal port can be determined by testing with a good module), there is a greater possibility of the failure of the end-to-end equipment and intermediate transmission link, so it is sufficient to check and replace the relevant materials.

2) Check whether there are overrun packets in the incoming direction of the port and the count continues to increase – query whether the input errors have increased by executing the “show interface” command many times. If so, it means that the overruns have increased, and the board may be congested or blocked.

Check whether there are gifts wrong packets in the incoming direction of the port and the count continues to increase – check whether the jumbo configuration at both ends has been consistent, such as whether the default maximum message length of the port is consistent, and whether the allowable maximum message length is consistent, etc. Compatibility of optical modules

 

In the delivery phase of the optical module test summary, the optical module compatibility test is the most basic test content, but also the most common problem. The reasons for this situation are as follows:

1) There are errors in the process of importing the compatibility code. The operations of testing the compatibility code can include: our company will carry out the compatibility test on the switch before the optical module is shipped, to ensure that the modules shipped by our company can be 100% compatible. We provide switches compatible with major brands of network equipment, such as Cisco, H3C, Huawei, HP, H3C, Alcatel, Mikrotik, etc.

2) The original UN upgraded compatibility code cannot work due to the software update of the device. In this regard, in the research and development stage, our company will do a large number of sample tests on the updated software to verify the feasibility of the software before mass production, etc.

3) Coding error, resulting in failure to write and read codes. The EEPROM chip can be replaced to update, write and retest.

The above are some measures to solve the compatibility problem of optical modules, and they are also the most basic content items that must be tested to ensure that all modules shipped have good compatibility.

 

Package loss of products is caused by the following reasons:

a. The electronic functional circuits of the optical module and the equipment do not match; For example, if the optical module is a Gigabit module, insert it into the 100m network port for testing. Some switches can’t support higher rate tests upward (and some modules can’t support downward), which leads to data loss in the process of Ping packets, although the packets can be successfully Ping.

b. The main chip does not match the device; For example, the main chip used in the same design cannot reach the pin to pin, and then the product cannot Ping the package, or even if the package can be pinged successfully, unpredictable abnormalities occur in the Ping package stage.

c. Physical line failure; For example, in the transmission process, it is necessary to ensure the normal operation of optical ports, network ports, switches and optical fiber cables, otherwise the Ping packets that cannot be checked will be lost due to the abnormality of this part.

d. Equipment failure; It is necessary to ensure that the PC end of the switch and Ping package and the terminal equipment is normal and within the same gateway.

e. Routing information error; For example, the IP of ONU is 192.168.1.1, but using software ping192.168.1.2, you can’t Ping anyway.

 

The link of the optical module is blocked

When the optical power meter is used for testing, if the optical power has light, but the link is blocked: think 

 

1) The end face of the optical port is polluted and damaged. The pollution and damage to the optical interface will increase the loss of the optical link, resulting in the connection failure of the optical link. The reasons for this situation are as follows:

a. The optical port of the optical module is exposed to the environment. If the exposure time is too long, the dust in the air will enter from the optical port and pollute the internal ceramic body;

b. The end face of the used optical fiber connector has been polluted, and then the optical port of the optical module is inserted into the optical fiber connector, resulting in secondary pollution;

c. The end face of the optical connector with pigtail is improperly used, falling from a high place, or the optical end face is scratched due to collision;

d. Use inferior optical fiber connectors; This will affect the Ping package and cause light leakage.

 

2) The link is blocked due to the abnormality of the optical fiber line. The main points are as follows:

a: The use of poor-quality optical fiber cable leads to excessive loss in the transmission process.

b: The optical fiber line breaks and breaks, which will cause the light to run away from the hole, directly resulting in the loss of all signals.

C: The bending of the optical fiber line is too large. When the bending of the optical fiber line exceeds 30 degrees, the optical power will be significantly reduced. Over 20 degrees, the signal has been basically cut off.

 

The above is the knowledge explanation of some abnormal conditions of optical modules brought by Shenzhen Shenzhen HDV photoelectric Technology Co., Ltd. The module products produced by the company cover optical fiber modules, Ethernet modules, optical fiber transceiver modules, optical fiber access modules, SSFP optical modules, and SFP optical fibers, etc. The above module products can provide support for different network scenarios. A professional and strong R&D team can help customers with technical issues, and a thoughtful and professional business team can help customers get high-quality services during pre-consultation and post-production work.  Welcome you to contact us for any kind of inquiry.