How to judge the compatibility of compatible optical modules

Why are compatible optical modules so popular?

1. In any network, there are many choices for compatible optical modules

If you choose copper core network, single-mode fiber, multimode fiber, a mixture of the two or other networks, the price of such optical module is very cheap, suitable for your equipment, and it is not necessarily the original optical module of the brand.

2. More competitive than the original optical module

Brand effect is a very common phenomenon. This usually shows that customers are spending money on the brand they are buying, not just the product itself. If you spend more money, it doesn't mean that the product can provide you with higher quality. If you want to completely improve your brand system, such as using brand compatible optical modules, you can save thousands of dollars and achieve the same effect.

3. Warranty with longer validity and better service

After sales service is of vital importance, as is the case with most products. Brand compatibility and longer warranty period. The quality of optical module can directly affect the transmission effect of optical fiber link. Although the quality of original optical module is very good, its price is very expensive. At present, the compatible optical modules provided by many suppliers are comparable with the original optical modules, and the price is very advantageous, which can help users save a lot of costs.

How to judge the compatibility and quality of compatible optical modules?

In large-scale network transmission system, cost saving is a very important factor, especially when a large number of optical modules are needed, especially the original optical modules. Therefore, a compatible module has emerged to solve this kind of problem. How to determine the quality of compatible optical modules?

1. Does our module have the data diagnosis monitoring interface (ddmi) specified in sff-8472 standard?

Ssff-8472 standard is the key factor to judge the quality and compatibility of compatible optical modules. It is formulated by SFF committee to define the data diagnosis monitoring interface (ddmi) of optical modules, which can help us understand the parameters of optical modules in real time. Ddmi, also known as DDM or DOM, has alarm function when one or more data exceeds the standard parameters specified by the manufacturer.

DDM monitoring parameters

2. Does our module have fault location function?

The fault location function can help engineers find problems, repair optical modules quickly and reduce down time.

If the compatible optical module has data diagnosis monitoring function (DDM), we can use DDM to analyze every parameter of optical module, such as output optical power, virtual channel connection (VCC), etc., so as to determine the fault point in the optical link.

3. Has our module passed the compatibility verification?

Compatibility needs to be tested on the switch to check the working condition of the module, which is the only way to determine the performance of the optical module. In general, the higher the optical compatibility.

4. How to test the compatibility of compatible optical modules?

The switch compatibility test will be conducted before the optical module is shipped to ensure that each module can be 100% compatible. The quality of optical module can directly affect the transmission effect of optical fiber link. Although the quality of original optical module is very good, its price is very expensive. At present, the compatible optical modules provided by many suppliers are comparable with the original optical modules, and the price is very advantageous, which can help users save a lot of costs.

In the network wiring, there are many possibilities of incompatibility between switch and optical module. Generally speaking, there are five main reasons: jumper fault between switches; connection joint failure; serious optical attenuation caused by the increase of jumper; mismatch of new optical modules; switch system failure. Start from these aspects to test the cause of the failure.

How to solve the incompatibility of switch optical module in network wiring?

The test steps are as follows:

① Replace the jumper and adapter, and the network still drops after operation, and conduct the next stage test;

② Replace the optical module and reconfigure the device, but still unchanged;

③ Through the optical power detection of light attenuation, after confirming that it is normal, the floor switch of the fault system is replaced, and the fault still exists.

Through three kinds of tests, the fault still can't be solved. The port configuration of core and floor switch can be confirmed. The two optical ports are forced to be managed in 1000m mode, and the protocol is automatically negotiated. After running for a period of time, repeated failures may occur. After analysis of this problem, it can be concluded that the failure of the protocol between the modules used by the two switches caused the port down.

To confirm the cause of the failure, you can try to replace multiple modules, and test through the electrical interface and optical converter. Then replace a pair of optical converters, respectively connect to the electrical interfaces of the two switches, and configure the two 100MB electrical interfaces, the fault should be completely eliminated and will not recur.

The problem of incompatibility between new and old switches and optical modules should be paid attention to in wiring, and it is not complicated to solve. The problem can be solved successfully by using optical converter, configuring electrical interface and forcing 100m. It should be noted that the optical converter used must be of the same model; 100m must be forced to be configured for the two electrical interfaces; the automatic negotiation mode must be cancelled for the configuration of each electrical interface.

There are three factors to judge whether the compatible optical module is reliable or not

1. Data diagnosis monitoring interface (ddmi) specified in sff-8472 standard

2. Fault location function

In the optical fiber link, fault location can help people quickly find and repair faults and reduce down time. Optical modules meeting the sff-8472 standard usually have the function of data diagnosis and monitoring (DDM). We can use this function to comprehensively analyze the transmitting power, receiving power, operating temperature, VCC, transmitter bias warning and alarm status, so as to determine the fault point in the optical fiber link.

3. Compatibility verification

Compatibility verification is to analyze whether the optical module can run normally in the working environment required by the host equipment, which is the only way to determine the performance of the optical module. In general, the higher the optical compatibility.

In some cases, if the working environment is not good, the performance of the optical module may decline, or even cause transmission failure：

1.The voltage exceeds the standard value of the optical module

2.The received power is higher or lower than the sensitivity of the optical module receiver

3.The temperature exceeds the standard value of the optical module

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