Re: [asterisk-users] Help With Physical Layer

[ludwingn]

Try to check CRC4, both hace to be the same Enviado desde mi smartphone BlackBerry 10. De: Tony Kasule Enviado: miércoles 1 de julio de 2015 01:11 a.m. Para: Duncan Turnbull; Asterisk Users Mailing List - Non-Commercial Discussion Responder a: Asterisk Users Mailing List - Non-Commercial Discussion Asunto: Re: [asterisk-users] Help With Physical Layer On Tue, Jun 30, 2015 at 2:15 PM, Duncan Turnbull <dun...@e-simple.co.nz> 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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