GLC-SX-MM.co.uk is a free resource for information on Cisco SFP modules. We cover all modules from the common Cisco GLC range to 10G and CWDM versions.
Some common topics are covered such as;
Cisco SFPs in detail
The Cisco GLC range
Compatibility: Industry secrets revealed
Cisco End Of Life (EOL) on GLC products
The new Cisco GLC range for 2012/13