I have some confusion on fibre GBICs, I understand the following are used for the fibre handoff.
GLC-SX-MMD 1000BASE-SX SFP transceiver module, MMF, 850nm, DOM
GLC-LH-SMD 1000BASE-LX/LH SFP transceiver module, MMF/SMF, 1310nm, DOM
Can single mode be used for multimode Gbic. Also, do every vendor has its own Gbic. We have Ciena 3930 and was wondering if Cisco gbic can be used?? Please supply all the information about the GBICs as I want to understand it in its entireity.