GLC-GE-100FX - Connection to 3550 Switch over MMF

[Mark Rigby]

Greetings, i have an OM1 MMF fiber run between two switches, the first being a 3750 and the second being a 3550.

The link currently exceeds the maximum distance for OM1 @ 1000Mb/s (220m) so i would like to downgrade the link to 100FX using the necessary SFP's/GBIC's to extend the maximum distance to 550m and run the link @ 100Mb/s.

I have the part code for the 100FX SFP to install in the 3750 (GLC-GE-100FX) but cant find a 100FX GBIC for the 3550, does anyone know if i can use a 1000SX GBIC (WS-G5484) for the 3550 at one end and the 100FX SFP at the other? Has anyone had success with this configuration over MMF?

Regards

[Sergey Fer · Accepted solution]

No, you can't use 1000Base-X fiber GBIC to implement Fast Ethernet link. You need to use some sort of external FE media converter instead.

[Leo Laohoo · Accepted solution]

The G5484 will NOT negotiate to any speed other than 1 Gbps.

[Mark Rigby]

Thank you both for your replies, just what i needed to hear.

Regards