hi thanks for the info, is there a document that you can refer me to with the spec? Is it an industry thing or a cisco thing? this line also has 3 connections along the way, so I'm also reading about insertion loss. If you count the fiber patch cords, there are 5 of these connections. I had the fiber tested last weekend and I'm waiting on the results.

thanks,

The attached document outlines the general rules for estimating the end to end fiber link loss.

The following link is to the Cisco SFP specifications showing 550m as the max distance over multimode fiber with the SFP.

<http://www.cisco.com/en/US/prod/collateral/modules/ps5455/ps6577/product_data_sheet0900aecd8033f885.html>

thanks, this is good, too, there seems to be a difference in the lenght limit based on whether or not the fiber is 50 or 62.5 micron. I'm pretty sure I have the 62.5, so I could be way over the limit.