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 jared@puck.nether.net clue++; | http://puck.nether.net/~jared/ My statements are only mine.