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New Member

GBIC fiber cable distance

In cabling specs and compliance information under Cabling considerations for GBICs there is a table that specifies cabling distance for a given GBIC model and fiber type. I am having some difficulty finding a definition for the 'modal bandwidth' column. It seems to have significant effect on distance but I don't know how to determine what my particular modal bandwidth is.

Is there a definition for Modal Bandwidth? Can I take a measurement of some sort to establish my modal bandwidth? Any light that you can throw on this would be deeply appreciated.

2 REPLIES
New Member

Re: GBIC fiber cable distance

Hi gwooten,

This should give you a clear point to start from, and yes, 'Any light' was a good pun!

http://www.cisco.com/warp/public/127/smf_mmf.html#topic1

Re: GBIC fiber cable distance

Modal bandwidth is a multi-mode fiber spec. You'll need to look that up for your particular cable. It's a measure of the amount of smearing the light wave will encounter as a result of the multiple modes/paths within the fiber.

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