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If as you say, Samsung acknowledged having a problem with 7100s with high radio on the line, then getting AT&T out there with THEIR chokes, filters or whatever will probably be the only thing that will solve this.

I appreciate you doing the tests. Without the other s/l phones ringing you have proved this problem is not coming in from AT&T ringing all lines at once and strange things do happen.

By busying out the main line, you have proved the multiple ringing problem is not tied to the main line.

When you saw even lines that didn't have a CO line start to ring, it 99.9999% proves you don't have an AT&T fault other than the music.

I often refer people to Mike Sandman and I would trust his radio filters but the problem could be so bad AT&T has to do something else.

I had radio on a CO so bad you could wave the buttset clips by the terminal without touching it and have blaring music and PacBell (at the time) had to come out and literally switch out pairs back to the central office. Just grounding all the other pairs in the terminal outside the office was not enough.

My best guess is that AT&T has to quiet those lines down and a few letters to Samsung about how they need to improve the tolerance to music will at least document in writing they have a problem.

You've done your tests, all that is needed is for AT&T to give you clear lines.

Maybe if you print out all these posts and hand them to the business office they will take pity and get an expert on the case who has successfully dealt with this problem before.

Good luck to you.


THE Bracha, old blond specialist in Rube Goldberg solutions.
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Out of curiosity, did you do a ground check? Like check to see if the ground on the outlet and the KSU ground - was actually ground, and not floating?


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If the 7100 trunk circuits are indicating ringing with nothing connected to them and the system performs flawlessly elsewhere it is almost certainly conducted EMI/RFI getting into the system, and not necessarily off the CO lines.

It could be something getting in on the mains supply due to either bad/missing grounding or interference. Is the UPS you are using online or offline - the latter pass the mains straight through when not operating so may not be doing much to filter mains interference.

Alternatively it could be interference being conducted back in on the station connections, are the DLM/SLM modules on the same UNI as the trunk module.

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Yeah,I did that the other day. I set the meter on OHMS and 1 lead to the system the the other lead to an outlet ground which read .1 or .2.

I'm still waiting to hear back from the AT&T tech, I'll give him another call later this morning.

I don't even want to go back out there until AT&T at least does something/anything to the lines.

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tdw: The TRM is on the Uni all by it's self and the UPS is a new APC 350.

Way back in the beginning of this thread I wrote that I was feeding analog ports off the Compact into the 7100 but they were using the Falcon sets off of the compact and on another occaision I had the CO lines split off with the 7100 and the Compact and again they were using the Falcons on the compact, so both times I just had 1 Falcon set connected to the 7100 and it never flipped out.

You may be onto something, I may be getting interference from one of the keysets that doesn't bother the compact but effects the 7100.

I haven't been back out there yet, but the AT&T tech told me today that he was told they were sending somebody out there to put chokes on the lines. I'll find out tomorrow if they did. One of the Falcon sets is about 2 feet from a standup electric heater at the front counter which is always on so it's something else to check.

Thanks everybody

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Just an update, since I haven't solved the problem yet because I've been busy on other jobs and couldn't babysit the switch for any length of time.

I went out there last week to see if AT&T choked off the AM radio on their side but it was still there, so I grounded all unused pairs coming from the Demarc and all the unused pairs going to the station ports, I also found the AM signal on their single line ports going to the cordless sets but once again the compact is purring along fine.

So this coming week, I'm going to place the AM filters right at the Demarc on the outside of the building and if I can't close the door, I'm going to put a plastic bag over it and see what happens. Their Fax line that doesn't terminate into the KSU and is unfiltered so I'm hoping that it doesn't bleed over somehow, in hindsight I should have purchased a filter for that also but I was PO'd and feeling cheap.

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If AT&T won't bother to fix the problem, you can file a Public Utilities Complaint. They hate those, it is more paperwork than they want to deal with.

From all of this detective work, I would say we have determined the 7100 to be inadequate at handling line noise that is commonly handled by older Samsung equipment and if indeed Samsung does care about it they won't tell you if they are working on a cure or not so your only two choices as I see it are to give them a refund or have AT&T do their job.


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If I can block it right at the Demarc and the trouble goes away then I'll push the issue harder with AT&T, righteous indignation and all that..lol

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Update #532
Ok, I say this with trepidation, continuous wood knocking while throwing salt over my shoulder.... but the trouble may be cleared.

Here's the low down:
1)I went out to the site on Tuesday and placed 2 of the Sandman AM filters right on the outside DEMARC that go to trk 701 & 702 of the 7100 and left the other 2 filters plugged directly into the 7100 for 703 & 704.

2)While I was at the outside Demarc listening for the AM radio I started hearing a surge of line noise on my buttset that would rise and fall and coincided with a Clang from a machine press that was inside the warehouse, so I ran to the front of the warehouse as fast as my stubby legs would carry me and lines 701 & 702 were normal BUT 703 & 704 were going nuts. Eureka!!!

Every time they ran that machine the lines would flip, So I called AT&T to have them meet me out there the next day and I then moved the customer back onto the DCS compact.

Next day: I met the AT&T tech onsite and explained what I found and pointed out to him that the CO ground was tied to the Electric Panel ground which was about 20ft from the clanging press machine and was it possible to put the CO's on a separate ground because that's where I thought the interference was getting in. Unfortunately, he said he couldn't because it would cause an imbalance and if lightning struck yada yada, but what he could do was put his AM filters on 4 of the five lines (the 5th line had DSL which is also line 704 on the 7100) so I said fine whatever you can do.

So with trk 701-702-703 now filtered at the DEMARC I had them crank up the press machine and trunk 704 is the only one flipping out, so now I'm hopeful..but not too hopeful. I then went out to the Demarc and split off the DSL on one pair and on another pair stuffed the Sandman filter into the box and sent it on to trk 704 via DSL filter to the 7100 and so far a full day and a half later I haven't received the screaming your system sucks call..but tomorrow's another day.

Note: The press machine only runs when they have an order of metal roof to make so it could run on any given day for 10-20-30 minutes and be off for 3 hours or it could be off almost the entire day and then have to run some sheets at the end of the day. I think you can see where I'm going with this.

Thank you Bunnie & everyone once again for all of the input.

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