sundance-communications.com/forum Forums Wiring - Telecom Carriers - Trunks & Services Cabling Telephones Systems Wiring Ring voltage

I would try that but somehow I think the RF situation has something to do with it.

Is this a new install or is this something that just started happening?

-Hal

Is this a new installation?

What is the REN of a buttset, and why are you using one instead of a standard 2500 set with a C4A ringer, or an E1C ringer for testing?

First, you need to have the LEC test the lines for metallic faults. Also ask them to test to see if there are bridged ringers or NID's left in place on your pairs. (NID's have capacitance equal to half a telephone, so your total REN count could be skewed if you are not aware of these)

Are there bridged line ringers on the premises?

Is the system grounded?

Have you tried reversing the T & R of the lines that do not ring?

Are the lines that ring, and those that don't, provided by different media, for instance, straight copper vs a SLC?

Do you have access to a line simulator such as a Teltone TLS 4 or 5??

Does the key system have SLT ports? You might want to take one of them and utilize it as a CO line simulator.

A Google search for "minimum line ringing voltage" yields this:

"Telcordia (Bellcore) Technical Reference.

"In accordance with TR NWT 57,a ringing voltage of at least 40 Vrms must be present across a maximum permitted ringing load of five REN (Ringer Equivalent Number), that is to say a maximum of five telephones connected in parallel, given a maximum line length of 930 ohms."

This is a new install. Excuse my ignorance but what's a 2500 set?

The system is grounded. All lines are straight copper lines from local AT&T provider.

I have not reversed the T&R, I will try that if I have to. The system does have slt ports but I didn't put them to the CO ports, I will also try that if I have to.

AT&T did come out tonight, I spoke to the guy over the phone and asked him if he could boost the ring voltage, he said no, I asked him if he could put RF filters on the lines (which the AT&T rep said they could do for us), he said since we don't hear radio on the lines, he's not going to. I don't know the outcome of his visit.

Thanks for all of the input, I'm sure I'll hear from them tomorrow.

2500 set

I could of swore there was a similar ESI issue like this in the past. If im not mistaken there was some programming that esi tech support had done to rectify the problem.

If this were posted in ESI instead of Cabling there would be an abundant amount of info verifying 80+ ring voltage being sufficient, especially since we are now having the same problem on replaced system.

The issue Rusty is referring to was probably involving CID & line receive volume instead of voltage.

How about we take the system (the first one that you replaced if you still have it) to another location far away from the RF. Verify the ring voltage just like you did here then see if it works. Betcha it will.

-Hal

The line that I get a 90 reading rings on the system, the other 5 do not.

When you say that 5 do not ring the system are you saying that they should ring the system but don't or are you saying they don't ring the system by design such as outdial only?

All six lines are programmed to ring dept 280 on incoming calls, which has 4 phones in it. Line 1 rings the other 5 do not.

Hal, the original system is the one they are running on since the replacement one did the exact same thing in our tests. If I can I'll test the replacement system which is here at the office with some copper lines when I have time.

I think someone else from my office is going there today to throw RF filters on and do more tests.

Since someone is going there anyway have them relocate the good line to a different port and make a test call. Only move the good line! Moving the bad line to the good port might screw up something.

I'm only speculating here but it is possible that previously enough voltage came down the bad 5 to cause damage but was not present during your voltage tests. I have had this happen before. The results are the ports are now bad but the source of the problem came from the provider. Nasty circumstance!

The confirmation of that would be the test system at another location. If all ports ring then you know it's something about the installed location.

Speaking of that, I would go a step farther and bridge a 2500 set on the line with it also connected to the system. If the phone rings but not the system then there is definately a problem with the system and I'm betting that it is sensitive to the RF.

-Hal