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Is Your Transceiver Cisco SFP And Cisco GBIC Compatible?
Try your transceiver module first if you're not certain if it's compatible with your existing equipment. Keep in mind that compatibility has nothing to do with the functions of the transceiver, but in identifying ID code.
Both SFP and GBIC introduced manufacturer coding within the transceiver. The coding was meant for network management software to be able to list down the pluggable modules within the network. On the other hand, to lock out third party transceivers aside from those that had the same host equipment's ID code, Cisco and other manufacturers used the coding system. This obliges you to use only Cisco products, but not anymore. Transceiver manufacturers have developed modules that are Cisco SFP compatible, for example.
SFP modules even have Digital Diagnostics as an additional feature, but not all SFPs have DD. Only the higher end SFPs used for extra long haul or for CWDM have DD. It allows the host equipment to read report details like actual received optical signal level, output power, and the temperature within the SFP module.
When selecting a transceiver module, attend to two things to ensure it is compatible with your existing host equipment: (1) Does the SFP require DD functions? (2) Does the host equipment verify the ID code and shut out third party modules? Hence, try it with your host equipment and see if it doesn't reject it to ensure that your transceiver module doesn't go to waste.
If you own a three-year old or more Cisco equipment, chances are your non-Cisco module will be locked out. Then again, possibly due to protests and pressure to stop monopolizing the market, newer Cisco equipment no longer has this feature. That leaves you two options: either you buy new Cisco equipment to be able to use cheaper Cisco GBIC compatible transceiver or keep your old Cisco equipment and bear with using more expensive Cisco transceivers. The choice is yours.
Remember that compatibility has nothing to do with the functions of the transceiver, so the brand doesn't really matter. What's essential is whether your host equipment needs DD function and does it shut out third party transceivers or not.
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