If you're using Cisco you buy the Cisco ones, and the switches don't know they are 3rd party. 2) Why are the costs of the SFP modules so different? Here is a generic one: ...

Like the move from GBIC to SFP the move from Xenpak to SFP+ seems inevitable, but currently there are four standard modules / form-factors available.

I have a Cisco GLC-LH-SM module in an ASR1002. This module claims to support both MMF and SMF, and I'm trying to use it with SMF. As far as I can tell, my cables and connections are good, but my ...

The Cisco C1300-8MGP-2X is available on Amazon for $718 and has a lifetime warranty. The eight-port unit supports 1Gb, 2.5Gb copper Ethernet, and 10Gb through SFP modules.