Please confirm GBIC

[news2010a]

Service provider will hand off 100Mbps circuit, SMF, 1300-nm.

If I get GBIC GLC-LH-SM, is this compatible with 100Mbps circuit?

If not, can you please recommend a GBIC that works for this.

[Leo Laohoo]

Cisco 100BASE-FX SFP Fast Ethernet Interface Converter on Gigabit SFP Ports

[news2010a]

Thanks for

giving the spec for 100Mbps SFP.

So it means I cannot hardset my switch port to 100Mbps and expect it to work with the GLC-LH-SM, right?  I got conflicting information on this.

[Leo Laohoo]

So it means I cannot hardset my switch port to 100Mbps and expect it to work with the GLC-LH-SM, right? 

The GLC-LH-SM will negotiate only to 1Gb, Full Duplex and nothing else.  You'll need to get a 100 mb SFP to plug into your 1Gb SFP port.

If you don't want to purchase the module, get the provider to open the link up to 1Gb but they can "shape" your speed to 100 mb.

[news2010a]

Ding. I got it.

Hey, you suggested model GLC-GE-100FX, but I see that is for MMF.

For SMF it should be this, right?

GLC-FE-100LX=

100BASE-FX SFP module for 100-MB ports, 1310 nm wavelength, 10 km over SMF2

[Leo Laohoo]

Yup.  That's correct.

[news2010a]

But wait a minute.

The one I listed, GLC-GE-100EX, does not say "SPF module for Gigabit Ethernet ports".

Switch I am going to use is:

WS-C3750X-48T

Strange that I see at cisco.com that the only "transceiver model" for this switch is

GLC-GE-100FX. But again this one is for MMF.

Please confirm right model please. Because again this GLC-GE-100FX is for MMF and and I need it for SMF. Now I do not know...

GLC-GE-100FX=	100BASE-FX SFP module for Gigabit Ethernet ports, 1310 nm wavelength, 2 km over MMF1
GLC-FE-100FX=	100BASE-FX SFP module for 100-MB ports, 1310 nm wavelength, 2 km over MMF
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

[Leo Laohoo]

Your right.  Ideally, you should be using the GLC-GE BUT since you've got the 3750X model, this is not supported.  If this is the case then I'd recommend you get a pair of SMF media converters.