atcomsystems.ca/forum Forums Wiring - Telecom Carriers - Trunks & Services Telecom Service & Providers Caller id issue

I monitor it with my caller id feature built in to my laptop. It just rings with no information at all.

That is not a conclusive method.

Read my questions again.

Loop current, circuit loss, or imbalanced line can cause caller ID problems on a POTS line. Take a Sidekick T & N and test for load coils. Load coils are generally added to long loops to extend the range of telephone service and need to be properly spaced for correct operation of Caller ID. Signs to look for: excessively Low volume(customer can't hear), excessively high volume, hum in line. Loop current should ideally be between 23ma to 35ma and circuit loss ideally around -5.5db, when calling the 1KC Tone from the LOCAL co.

If you will fill out one of Sandman's Telephone Line Diagnostic Table https://www.sandman.com/files/teldiagchart.pdf
on a known working line then the bad line I promise it will stand out like sore thumb.

KYTIEDOWN:

Exactly my point that I was going to make next, had he told me the answer to question #3.

Without knowing all the parameters of the lines, he's going to be frustrated. A laptop is the last thing I would have thought of as test equipment. I guess I'm getting old.

Here's a nice tool to use WITH the laptop:

https://www.adventinstruments.com/products/p-5120.htm

My first remote diagnosis, from a supine position watching the History Channel, is "load coils." My second is "bridged taps."

Are there usually load coils in the central office? My company issued laptop, with a caller id unit built in, is all I am given to test with. It is the sub who is frustrated, not me.

Well, they will between the customers demarc and the co. Specifically, the coils are placed at 3000' intervals from either end, and at 6000' intervals along the wire. Load coils boost the strength of the voice frequency range (300 - 4000Hz)

The trouble is in the central office, coming straight out of the switch. The outside lines have no effect as they have been removed for testing.

So did someone test for the failure at the co? Where did you test at the demarc(nid)?

Can't be much clearer than this.

Have any of our CO techs seen this problem out of a switch that can help out Phony?