Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

gbics and fibre types

Hi all, Can anyone tell me if only certain gbics will work with certain fiber types ie single and multimode, ie can I run lx type transceiver over multimode fiber ?


Re: gbics and fibre types

Take a look on the attaachment, i hope this helps you..

New Member

Re: gbics and fibre types

So, by the looks of it, can you not use Single mode fiber with SX gbic's ?

Can you use multimode fiber with LX gbics ?


Re: gbics and fibre types

In Multimode(MM) ur signal travels in approx 50/62.5 micrometer pipe

In Single mode(SM) ur signal travels in approx 8-10 micrometer pipe.

So if something made for MM will not work with SM fiber. Think of water coming from a 50-60m pipe cannot be connected to 8-10m pipe.

You can connect a SMF to a MMF but you will not get the distance specified for SMF.

You can use use mode conditioning patchchord when u have to connect MMF to SMF but they will introduce loss so u have to see ur distance.

Lower speed go over MMF (F for Fiber)

High speed can go over MMF but for smaller distance.

For higher speed and long distances SMF are preferred.

So SX gbic mostly will be over MMF

LX mostly go over SMF

CreatePlease to create content