Let me guess - you used an EtherNet cable to connect the E1 port to the Telco's box on the wall, and it is several metres long?
Although the plugs look like EtherNet plugs the cable actually has the wires paired differently. The crosstalk of just a few metres of cables incorrectly paired like this is often enough to give a gentle stream of bit errors. Cat 5 cable is OK. The EtherNet plugs are OK. They just need to be wired differently.
Regards, Steve
Nir Simionovich wrote:
Hi All,
Well, as some of you alrady saw myself and Optimus on the IRC channel, I guess you already
know us. In any case, I've been battling the following issues during the past few days:
1. My Telco claims that he can see many CRC4 errors originating from my side of the PRI line.
If your line dies and you can see smoke pouring from the local exchange building, the Telco will still say the problem is your fault. It seems to be a basic quality of Telcos in every country :-)
Although I see that everything looks fine, I can't really see if there is a CRC4 problem. I've
managed to play around with zaptel.conf, and when I set the tonezone to FR, the number
of errors decreases. I think that the problem resides withing the definition in the zonedata.c
file, however, I didn't find any explenation of the files syntax.
I may be barking up the wrong tree here, but if anybody has a better idea, I'd love to hear it.
2. I've been asked to find some additional hardware to work with, and the only thing listed as a
PRI line card on the Digium site is Dialogic. Dialogic E1 cards cost around 6000$ !!! Which
about 10 times more than Digium. Has anyone got any experience with another PRI card that
works with Asterisk?
Apart from these 2 issues all is working fine, and we are very happy with the Asterisk. I will be
sending everybody some nice figures soon, so hold on tight. Oh, just to do something funny, try
performing the next trick:
Configure a single PRI line with 30 channels, call the first channel which calls the second channel,
which calls the third channel and so on, till you get to 30. Now, take the target phone ear piece, and
bring it up to the microphone of the source number. Say something next to it, and you will hear the
delay of voice on your machine :-) Results tend to be very amuzing :-)
Nir S
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