Weak Ring Current on Obi302
n4mwd:
I compare it to the grandstream because the REN specs on the OBI are better. The 302 has a REN of 5 and the GS is only 3. I do have several phones with mechanical bells. The electronic tweeter bell phones are too hard to hear.
Just to be clear, the problem is not a weak ring, the problem is that they (all phones) start to ring and then stop, then repeat for the next ring. That is, instead of ringing for 2 seconds per cycle, they ring for 1/10th second. Sort of like the obi tried, but hit some sort of current overload or something.
Its not incorrect ring cycle programming because if I unplug enough phones, it works normally.
So I'm thinking now that if a REN 3 can ring all of the phones, a REN 5 should be able to ring that plus more. Is that correct logic? If so, then it may be that my obi is defective.
SteveInWA:
You keep returning to your original argument, that the OBi should work because it has a higher REN. The reality is, ancient mechanical bell phones that are perhaps 50-70 years old, have old, corroded, rotten internal "networks" (an inductor/capacitor) that may or may not still be functional. Add to that, house wiring that may be altering the impedance of the line. Yes, in theory, 5 REN is better than 3 REN. However, your real-world test, in your house,
with your phones, fails. There is no guarantee that every phone will ring as if in a laboratory test using fresh, new components.
I described, in my earlier post, a troubleshooting procedure to determine if one of those old phones is causing the problem or not, by systematically unplugging one phone at a time, and seeing if the ring behavior changes. If one phone causes the problem, but not the others, when all but one phone are connected, then that phone is a dud. You can power that one phone with the Grandstream and leave the rest on the OBi.
n4mwd:
I did the test you suggested and the only anomaly is that the phone with the long run does fail with fewer phones connected when it is connected. Before I started this thread I replaced the bell phone out there to a brand new electronic phone. I was surprised that it made no difference.
So it just appears that there are too many phones, electronic and bell combined, on one obi line. I'm thinking that the only workaround is to split the phones around the two obi lines.
My guess is that the GS did not have current limiting circuitry to shut off the current if more phones were connected than allowed, and the obi does.
kb3pxr:
Try the following settings:
Ring Voltage: 85
Tip/Ring Voltage: 52
Off Hook Current Max: 27*
* If you aren't using electronic phones, go ahead and crank this to the full 45.
This get's the ring voltage as close to Bell Spec as possible, loop current to a sensible range (Obi really should have the default as 23 as that's the minimum for a real line), and the Tip/Ring Voltage simulates the Central office floating the batteries (normal condition).
I'm not sure this will help as I'm not sure how Obi rates REN on the adapter. Grandstream (who you are comparing to) has a 3.0 REN limit assuming a 1km line. Since your line isn't a kilometer long, the Grandstream will actually let you run a bit higher. Currently I'm on a Grandstream device with Vonage (test page is available in user mode btw) and my 1.0 REN electronic phone reads somewhere between 0.3 and 0.4 REN to the ATA.
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