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I still think that if you tinker with the ringer's bias spring, you might be able to get it to respond.
If you are worried about damaging the DSL unit, you can always consider using Viking Electronics' #RG-10A ring booster. It is fairly tolerant of voltage/frequency issues on the input side and provides nice and healthy ringing output. It's made specifically for use behind VOIP/ISDN/DSL terminal equipment for this reason.
Check it out Here . If you use it, you won't have any more ringing problems!
If you monitor the ringer leads with a butt set what do you hear? you should hear a low frequency buzz. A frequency mismatch will keep your ringers from working. If you can locate where the ring current is being supplied at you may be able to replace it with one made in the US. I had the same type of problem when i tried to use an old Harris switche for ring current through an Executone IDS
George, we already touched on the issue of frequency a while back. You are correct, that's likely the issue here. Here is the original post discussing frequency issues:
Quote
Originally posted by EV607797: You should not see any AC voltage when the line is idle. By setting your meter to the AC setting, it's just reading the DC voltage and effectively doubling it, giving you a false reading.
It sounds like the 90 volts that you are detecting during the ring cycle is fine. There is an issue of AC frequency though. U.S. straight-line ringers are designed to respond to 17-33 Hz. Being in Europe, there's a good chance that the frequency of the 90 volts is outside of this range.
I do need to ask these questions:
You had mentioned that you were using 2565HKM sets before. Did the ringers work properly in these sets? If so, we may just have an internal wiring issue.
Is the Call Director set new or is it one that was used? If used, there's a good chance that a diode may have been used in the ringer wiring as a field modification.
That's strange that it would be the same frequency as the AC power distribution network. Regardless, even if it is, that would definitely be the reason that you are having trouble with a U.S. ringer.
