... 2,All compatible Transceivers SFP,GBIC,BIDI,XFP,XENPAK,X2,SFP+,CWDM,G-PON,E-PON Modules,like Cisco,Nortel,Extreme,Foundry, ... is very lowest than original SFP modules.3,Our SFP modules 100% compatible with allmost switches like Cisco,HP,3COM,Nortel,Alcatel,Extreme ... .....4,We should invest more fund to R&D new ...