cross connect reliability

Carlos Alcantar carlos at
Fri Sep 18 03:02:34 UTC 2009

We seem to have the highest failure rate on cross connects from ds3's
and t1's.


-----Original Message-----
From: Brandon Palmer [mailto:bpalmer at] 
Sent: Thursday, September 17, 2009 5:59 PM
To: Michael J McCafferty; nanog
Subject: Re: cross connect reliability

We've never had a fiber CC fail.  
We HAVE had DS3 and T1s fail.  Those were due to other customer circuits
being installed near ours and bumping them.

>>> Michael J McCafferty <mike at> 9/17/2009 5:45 PM
Today I had yet another cross-connect fail at our colo provider. From
memory, this is the 6th cross-connect to fail while in service, in 4yrs
and recently there was a bad SFP on their end as well. This seemes like
a high failure rate to me. When I asked about the high failure rate,
they said that they run a lot of cables and there is a lot of jiggling
and wiggling... lots of chances to get bent out of whack from activity
near my patches and cables.
Until a few years ago my time was spent mostly in single tenant data
centers, and it may be true that we made fewer cabling changes and made
less of a ruckus when cabling... but this still seems like a pretty high
failure rate at the colo.
I am curious; what do you expect the average reliability of your FastE
or GigE copper cross-connects at a colo?


Michael J. McCafferty
Principal, Security Engineer
M5 Hosting 

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