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#613005 10/02/17 11:19 PM
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RonP Offline OP
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Got a customer with an SL1100 with 4 CO lines from Spectrum hooked up to the system. Line 1 has noticeable static when on a call with a system phone. Other lines appear to be ok. I tested line 1 with my butt set by isolating line 1 and connecting to the spectrum demarc. No static. So far I've run program 90-68-01 (reset). I've also measured loop current which was at 39ma, on the high side. Aha, I figured, I'm onto something. Contacted Spectrum who didn't know what loop current was but will dispatch a tech tomorrow to, I guess, twiddle their thumbs. Contacted NTAC who advised lower gain in 14-01-02 and 03. They also advised I lower codec in program 81-07-01 from 0 to 1 (reset). It helped but static is still there. my next step I guess is to pad the lines, but if I do what size resistor would be needed. Does anyone else have any theories on this?


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Did you move line one to another line port to see if it follows?

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Have you tried moving line 1 to trunk 2? If the static moves to trunk 2 I would have Spectrum look at their settings or replace their equipment.

This is off topic, if you haven't already un-check 14-02-24 for each trunk. This is a known issue with cable equipment and only cable equipment causing conversations to cut out.


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I'll do that....thanks for the tips


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RonP Offline OP
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Ok, I'll ask a crazy question. What's 14-02-24? I don't see that code in the manual.


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14:02:24 Found in SL2100 programming. Reference Analog trunk setup. call waiting,,
You are working on the SL1100 correct?


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O, I'm working on an 1100......with an old manual. Just went on the NTAC website and downloaded the latest and sure enough, there it is. I guess this is where I wipe the egg off my face.


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A side note, I just installed a brand new SL1100 and ever since the install, customer was complaining about audio on calls cutting in and out and even reports of the far end hearing a tone or beep once in awhile. I tried everything I could think of (short of replacing the KSU) and could not replicate the issue consistently. I opened a ticket with NTAC, and they immediately said to uncheck 14-02-24 (which is call waiting caller id) and is on by default. I informed them that the customer does not subscribe to call waiting on any of their lines, but NTAC was insistent that I give that a try. I disabled that on all three of their lines, and to my amazement, the problem has disappeared. I'd sure give that a try, it can't hurt.

Last edited by ffej010; 10/07/17 06:39 PM.
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RonP Offline OP
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Good to know for future use. The resolution to this issue was something else, and I'll admit something I overlooked. Line 1 went dead the next day. Tested ok at the demarc, but was dead at the tail which plugs into the SL. Switched to a spare tail. Line is up, static is gone. *dope slap*


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Sometimes it's the simple things. With connections like CO's or Stations always trace a problem from a known good point to the point of failure. But you know that, right?


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