Optical Modules for Commercial, Extended and Industrial Temperatures

      Optical modules can be categorized into commercial temperature, extended temperature and industrial temperature according to the temperature range as follows:

Table 1 Temperature range of optical modules

      Users can choose modules with different temperature ratings according to the actual application environment. The larger the required operating temperature range, the higher the corresponding requirements for module performance, and the higher the module price will be. Generally indoor with cooling conditions of constant temperature room, commercial temperature module is the optimal choice. If used in outdoor nodes in tropical areas, modules with extended temperatures can be considered. However, outdoor nodes in middle and high latitudes, such as Beijing, require the use of industrial temperature grade optical module products. Special attention should be paid to the fact that the above temperatures refer to the shell temperature, rather than the ambient temperature or the temperature of the air, because the optical module is generally a metal die-casting shell, so the temperature of the shell of the different regions is relatively close. Accurate measurement of the module's shell temperature generally need to use a contact temperature probe.
      Today's mainstream optical modules are generally with digital diagnostics, the module will be set according to the requirements of the MSA corresponding to the internal temperature threshold, and real-time reporting of the module's enclosure temperature, the host computer can read the enclosure temperature of the optical module, so that network administrators can observe whether the module is working in the normal temperature range.

Table 2 Temperature thresholds set by optical modules

      How to avoid the failure of high working temperature of optical module, you can refer to the following suggestions:
      1. According to the use of the environment, select the appropriate level of commercial-grade, extension-grade, industrial-grade optical modules.
      2. Pay attention to the thermal design of the equipment, usually good cooling duct structure, there is an active fan air supply machine, the module temperature will be closer to the ambient temperature.
      3. Try to use optical modules that support DDM (digital diagnostic) function to monitor the temperature of the optical module as well as the status of each.
      4. Consider inserting high-power optical modules into switch ports at intervals to reduce localized high temperature conditions. In the SFP module, EML laser 10G long-distance module and 10G electric port module, power consumption is relatively large, in high-density installation, high ambient temperature, the host air supply is too small, and other factors are superimposed, it is easy to over-temperature situation.
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