Static, One way only.

[lever]

Hi all,
I'm having reports over the last few days of static on the lines. This seems to be our end, as customers can't hear it. Also happens internally (even dialling to V/M) so I don't think it's the carriers. Course it's intermittent so difficult to track. Not effecting every one but I've had it as well. Done most test/measurement checks. Looked to see if just users on one board, checked for errors, alarms.... nope, Nothing !!
Here's hoping for someone to help. And all help is going to be appreciated. G3R V11, UK, ISDN trunks (loads)
lever.

 

[Definity]

Do you mean even the station to station call can also result in a one way call?
Looks a strange problem, have you checked whether the calls happens between users on same cabinet or different cabinet? between the EPN's. I mean some more details on the problem.

 

[Steve852]

Do you run your ISDN lines through a voice recorder?
Have had this problem before and found that the T connector in the back of a recorder was faulty.

 

[lever]

Thanks forgetting back so quick Definity.

They do seem (at the moment) to be on EPN but not on the same shelf or card, but yeah, can be an external call or internal call. Makes no diffrence, and only the person making the call can hear the crackling not the B end so to speak. You can talk over it, but it is loud.
lever.

 

[dufus2506]

Whenever I hear static as a problem, I immediately check (in this order) handset cord, handset, and on analog phones, hookswitch.

The handset, hookswitch, and the touch tone pad are the only moving parts on phones, so they are the only parts that truly "wear out", and cause static.

If the phone in question has one of those twist-stoppers, It's ALWAYS the culprit. (Not sometimes, ALWAYS.) In a business environment, they work for about 6 months and then mutate into static generators. I remove them whenever I find them, even if they haven't failed yet.

If the person insists that they must have one because their handset cord gets twisted into knots, it's because the phone is on the wrong side of their desk, and they are twisting the handset as they pass it from one hand to the other when they answer and hangup. Move the phone.

If it's an EPN wide problem, that is everyone at one time or another hears the static, you might have a bad expansion interface card. The trouble could be being inserted right at the timeslot level.

You might also consider environmental issues... Has anyone recently installed a mobile phone cell site nearby?

Carpe dialem! (Seize the line!)

 

[lever]

dufus2506, love the footnote.

I'm of the same mind when it come to those twist-stoppers, and that was my thought first too. Hadn't looked at the Interface card, I'll have to check that out next.

lever

 

[letman]

sometimes when you hear static in one direction it is a four wire problem. Is your epn connected with ti,s? If so this may be a problem on the receive side of one of the t1,s

 

[lever]

Just had a Minor Alarm on the Expansion Interface card. Managed to clear it for now, but I'm going to get it replaced before it bite's me. Checking in the manual it could be the tone clock.
Thanks to all.
lever.

 

[lever]

OK,
Finally got the Expansion cards swapped over along with the fibres and transceivers. Static’s gone, but now I’ve got DS1’s with slippage on them. Started with one (swapped over the CO-AX and DS1 card) Then had the maintainer out with an Aurora test phone (for pri’s) they confirm it’s a fault on the cab end. Now escalated, as it’s 5 DS1’s and not just the EPN now. Maintainer’s seem stuck on what to try next.

Anyone…please.
Lever.