100Mb SFP in 1000Mb Port

[Highnet_TSC]

I am struggling to find an SFP transceiver, single mode, that operates at 100Mbps in a 1000Mbps port in an ME3600 or ME3800.

Is there such a transceiver?

[Giuseppe Larosa]

Hello Duncan,

see the 100 Mbps SFP compatibility matrix

http://www.cisco.com/en/US/docs/interfaces_modules/transceiver_modules/compatibility/matrix/OL632702.html

the SFP exists for SMF

GLC-FE-100EX=	100BASE-FX SFP module for 100-MB ports, 1310 nm wavelength, 40 km over SMF
GLC-FE-100LX=	100BASE-FX SFP module for 100-MB ports, 1310 nm wavelength, 10 km over SMF2

on table 4 are reported the supported models for metro ethernet switches and minimum IOS version

ME-3600X-24FS-M

(client ports only)

Hope to help

Giuseppe

[Highnet_TSC]

Hi Giuseppe

Those are for use in 100Mb ports, aren't they?  I'm looking, essentially, for an SM equivalent of GLC-GE-100FX=

Thanks

[Giuseppe Larosa]

Hello Duncan,

you are right I have misread their descriptions

I'm afraid a SMF module is not available if so, you should use an external converter from MMF to SMF

Best Regards

Giuseppe

[Highnet_TSC]

Hi Giuseppe

The GLC-GE-100FX does not appear to be compatible with the ME3800-24FS-M (which are the models I use).

I'm pretty confused, though.  It says that GLC-FE-100LX are compatible, but also that they only work in 100Mb SFP ports.  The ME3800-24FS-M doesn't have any 100Mb SFP ports, they're all 1000Mb, so how could it be compatible...

[Giuseppe Larosa]

Hello Duncan,

C3800X data sheet clearly states that these 100 Mbps SFP are supported

see

SFP ports:

• 10/100/1000BASE-T SFP-based ports: RJ-45 connectors, 4-pair Category 5 UTP cabling

• >>>100BASE-FX and -LX: Duplex LC receptacle fiber connectors (multimode and single-mode)

http://www.cisco.com/en/US/prod/collateral/switches/ps10905/ps10965/data_sheet_c78-601950.html

So they may be the solution for your connectivity needs.

The switch port may be so smart to perform speed change when detecting  the 100BASE FX SFP.

Hope to help

Giuseppe