North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: Cable-Tying with Waxed Twine
On Wed, Jan 24, 2007 at 09:41:22PM -0700, Larry Beaulieu wrote: > > The other thing I found interesting; The use of Zip Ties on Copper Cabling > > is frowned upon by BICSI. Velcro preferred. > > > > Something to do with the compression on a twisted-pair cable caused by > > over-tight nylon cable ties screwing with their twist rates, and thus > > changing their Crosttalk characteristics... > > Yep. > > For starters, the stuff that Dan Mahoney is looking for is properly known as > waxed linen lacing cord. In a past life I used to order the stuff made > by Ludlow Textiles through Graybar, their part # back then was 89039323. It's > not always in stock in individual stores. > > As for plastic ties (TyRap is the brand name for the Thomas & Betts version) > they may be easy to use, but they do have several functional drawbacks, > including: > > 1) difficulty in maintaining consistent tension from tie to tie, and as > a correlary it is comparatively easy to overtighten one, risking > compression-related damage to the underlying cabling, or as mentioned above, > increasing crosstalk when using twisted-pair cables > 2) can harden and/or become brittle over time, eventually failing under stress > 3) typical background vibration causes them to tend to chafe the sheaths of the > wiring that the ties are in direct contact with, over a period of years. This (and the other superbowl related emails) reminds me of a time I had a DS3 go down (on superbowl sunday). It had some chronic errors that would pop up where it would go down seemingly randomly. What we found out after a few more outages was that this (LD) carrier who placed their facilities next to train tracks had a more chronic issue of a train going by and causing LOS or errors on the circuit where they handed it off on coax to the ILEC/CLEC. Getting someone dispatched to look at the circuit on that sunday was problematic to say the least ;) - jared -- Jared Mauch | pgp key available via finger from [email protected] clue++; | http://puck.nether.net/~jared/ My statements are only mine.
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