On Tue, Jun 30, 2015 at 2:15 PM, Duncan Turnbull <[email protected]> wrote:
> > Hi Tony > > I'm not familiar with the card you but 120 ohm is usually twisted pair, > and 75 ohm is coax (usually). If it is changeable its usually done with > jumpers on the card. > The new Digium cards have no jumpers anymore and I don't think they support coaxial cables. The only changes we can make on the digium cards is to switch between E1/T1 modes and that's done when loading it in the kernel using modprobe. > I have used RAD modems before and their cable will have a specific > pinout that you need to match. I doubt your digium card by default matches > the pins, but maybe, and perhaps maybe your alcatel did. There will be a tx > pair and an rx pair and you need to make sure they connect to the rx and tx > pairs on the digium preferably with the same polarity. If you are getting > no signal I would think its that. You can use a multimeter to check for > voltage on the pins. > I would doubt it's the pinout but it's possible. I have tried several cables (cross-over, straight-through, E1) and both didn't work but surprisingly, they do on the other RAD modem that comes to the same PBX. > > Once you get that sorted another catch maybe timing. You will need to take > E1 timing from one or other of the Telco's, with one as the primary > source. If they for some reason aren't synced you will get errors every so > often > Thanks for the pointers. I am going to keep trying several things and if I get a break through, I'll definitely share the results. For no, any more help is welcome. thanks!
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