We're constantly cutting customers over to our new DLC's in the rural area's. After doing so we remove the old jumpers from the CO mainframe. Now we are coming up with a lot of vacant cable pairs leaving the office.
Here's the question; should we ground the vacant cable pair by using grounding heat coils? The reason why I ask this is, I am concerned about capacitance on the old cable pair possibly affecting DSL train up on adjacent cable pairs. By grounding the old cable pairs at the frame it should dissipate this capacitance.
Also, should this practice already be implemented regardless of a possible DSL issue?
Posted - 04/03/2008 : 09:12:04 AM
The NEC has specific requirements. This month's issue of CBM (Cabling Business Magazine) has a good article. I will post the article or a link to it soon. (I left the magazine at home)
Good question....curious to see what other companies are doing with vacant /ungrounded pairs???
Please post your thoughts on this to help Neil out!! Thanks everyone!!
Posted - 04/04/2008 : 11:05:35 AM
I had a chance to ask Don McCarty your question. He stated that both ends of the dead pairs would need to be grounded to mitigate interference.
I'll look through the CBM/ NEC article referenced in my earlier post and see what it has to add to that advice.
Posted - 04/04/2008 : 7:13:08 PM
I asked the switch tech at work, and another tech who worked in telecommunications while in the armed forces- both replied with the same answer: "When in doubt, ground it out." The switch tech qualified his answer by stating that to give a good answer, he would need to know the specifics about the equipment the pairs come into contact with. Neither were specific about the method of grounding due to the lack of knowledge about the specific cable pairs in question. Looking forward to reading the article Jay mentioned.
Posted - 04/05/2008 : 9:10:55 PM
The article in CBM I thought dealt with OSP, but it's discussing inside wire/cable. The NEC calls for removing dead, abandoned cable inside a business. The NEC does discuss how grounding should be done on all cables entering inside and crossing into the OSP region. I do not have specifics. I would wager we could also look at the RUS guidelines for telco's as they use the NEC and ANSI and other specs for their recommendations.
check out the www.usda.gov website and link over to "RUS"....I'll do some looking myself.
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Posted - 04/01/2008 : 11:53:00 AM
