Phone Line Issue w/Obi 110
Ostracus:
Quote from: sailing on September 10, 2014, 04:21:56 am
Sorry for not responding sooner but I don't get to read the forum everyday.
The on hook voltage is irrelevant. The off hook is where the problem would lie. 70mA seems awfully high but you didn't measure the voltage during off hook. Measure voltage and current off hook with a phone. Repeat with the Obi installed, with the phone plugged into the Obi off hook.
The POTS specification is a compromise to allow few problems under almost any circumstance, such as being too close or too far from the CO. Some lines will be just outside the spec but a phone will work regardless. My thinking is your setup may be operating in this type of situation. The phone company only needs to make the lines work with phones so they know how to do that. Electronic devices are designed to work within a certain spec. Once outside of it and they may have problems.
As of a couple of years ago, the integrated circuits in the Obi110 were from Silicon Labs and probably still are. I'll see if I can get the general specs for their POTS ICs. Then the above voltage and current measurements can be compared.
Picture of a dead Obi110.
DanielG:
Will give that setting a try and touch back.
Daniel
DanielG:
I tried the setting and it didn't help either. Any other thoughts? We are finding that this is significantly worse at one store than the rest but they all still have their occasional hiccups.
Daniel
Shale:
Quote from: DanielG on September 16, 2014, 12:50:26 pm
Any other thoughts?
If I had suggested trying a 10 dB 600 ohm pad, instead of the resistors, would you have found that credible?
Mango:
My POTS line also has a high loop current and I experienced similar symptoms to you. Unfortunately, I damaged the line port - I assume permanently - on two OBi110 devices before I figured out what the problem was. I don't know if the CurrentLimitingEnable setting would solve the problem or not. I don't have any more OBi110 devices that are not in use and I don't want to try it on my last remaining one in case I damage it too. If you try it on a fresh OBi110, please let us know if it solves the problem. In that case, it would be very disappointing that this was not enabled by default.
Since installing this device, the OBi110 has performed properly: http://www.sandman.com/loop.html#LoopCurrentRegulator
The regulator auto-adjusts so if the loop current on your lines fluctuates (as mine does) things should still work properly.
If you're electrically inclined, here are some photos of the device: http://www.dslreports.com/forum/r29099727-From-now-on-I-ll-use-a-loop-current-regulator-with-my-OBi110
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