web statisticsweb stats Business Phone Systems Tech Talk Forum - VOIP & Cloud Phone Help

Business Phone Systems

Previous Thread
Next Thread
Print Thread
Rate Thread
Page 2 of 2 1 2
Joined: Jan 2005
Posts: 15,378
Likes: 13
Moderator-Vertical, Vodavi, 1A2, Outside Wire
*****
Offline
Moderator-Vertical, Vodavi, 1A2, Outside Wire
*****
Joined: Jan 2005
Posts: 15,378
Likes: 13
My guess then is that the second pair is providing enough capacitance to 'absorb' any induced hum. This would often happen on paging adapters that were connected directly to CO lines. What we did in these instances was to connect a 'half ringer' module from a standard NID across the line to eliminate the hum. Keep in mind that inductive hum can come from the tiniest of stray voltages, especially when a line runs over long lengths of quad (non-twisted pair) wire. This drop wire is just that, shielded quad. With the sheath not grounded, it picks up just about anything out there like an antenna.
https://i.ebayimg.com/images/i/400465573437-0-1/s-l1000.jpg


Ed Vaughn, MBSWWYPBX
Atcom VoIP Phones
VoIP Demo

Best VoIP Phones Canada


Visit Atcom to get started with your new business VoIP phone system ASAP
Turn up is quick, painless, and can often be done same day.
Let us show you how to do VoIP right, resulting in crystal clear call quality and easy-to-use features that make everyone happy!
Proudly serving Canada from coast to coast.

Joined: Oct 2006
Posts: 1,384
Likes: 6
Member
Offline
Member
Joined: Oct 2006
Posts: 1,384
Likes: 6
Read the conductors with an ohm meter for shorts, opens and grounds.

What does it sound like with the barn inside wires disconnected?

Joined: Feb 2005
Posts: 12,342
Likes: 3
Member
***
Offline
Member
***
Joined: Feb 2005
Posts: 12,342
Likes: 3
There's leakage between the red and yellow and or leakage between the black and green. Put em' together and there is no place to leak to except themselves.

-Hal


CALIFORNIA PROPOSITION 65 WARNING: Some comments made by me are known to the State of California to cause irreversible brain damage and serious mental disorders leading to confinement.
Joined: Jan 2009
Posts: 849
Likes: 1
Member
Offline
Member
Joined: Jan 2009
Posts: 849
Likes: 1
I agree with Hal. I bet if you took a simple VOM meter you'd see faults in that buried cable. Are the NID's one each end of this OPE properly grounded and is shield on the cable itself properly bonded?

Joined: May 2002
Posts: 17,722
Likes: 18
Member
****
Offline
Member
****
Joined: May 2002
Posts: 17,722
Likes: 18
I'd test it, but I'm with Ed.


Retired phone dude
Page 2 of 2 1 2

Moderated by  Silversam 

Link Copied to Clipboard
Forum Statistics
Forums84
Topics94,262
Posts638,693
Members49,757
Most Online5,661
May 23rd, 2018
Popular Topics(Views)
211,098 Shoretel
187,703 CTX100 install
186,793 1a2 system
Newest Members
BPopilek, Rich F, LewisR, TDKs79, Buttinset
49,757 Registered Users
Top Posters(30 Days)
dexman 18
Toner 14
TDKs79 8
Who's Online Now
2 members (Curlycord, dexman), 84 guests, and 247 robots.
Key: Admin, Global Mod, Mod
Contact Us | Sponsored by Atcom: One of the best VoIP Phone Canada Suppliers for your business telephone system!| Terms of Service

Sundance Communications is not affiliated with any of the above manufacturers. Sundance Phone System Forums - VOIP & Cloud Phone Help
©Copyright Sundance Communications 1998-2024
Powered by UBB.threads™ PHP Forum Software 7.7.5