Rhino R8FXX-EC + 1 FXS + 3 FXO card echo problem?

[Speedy2k]

Hi, i have a Rhino R8FXX-EC + 1 FXS + 3 FXO Modules w/ Echo Cancellation and i have some echo problem, i am trying to adjust the RX/TX gain on the card, but doesn't seems to go well, I have follow this tutorial:
http://www.mattgwatson.ca/2008/05/howto-tune-zaptel-dahdi-fxo-interfaces-on-asterisk-pbx/
I have 4 PSTN Line connected to this card.
I am using the (905)290-0102 milliwatt test tone, when i adjust the RX gain to 14844, i have value like that:
Line 1:10.6
Line 2:9.8
Line 3:9.7
Line 4:9.8
When tuned like that, the line seems to have some noise on it. To adjust TX gain, i have open 4 ztmonitor windows 1 on each channel.
And every line is redirected to the milliwatt test tone i have here is the code:

[to-milliwatt]
exten => s,1,Answer 
;exten => s,n,Milliwatt()
exten => s,n,PlayTones(1004/1000) 
exten => s,n,Wait(3000)

So when i call the first line from the second line, i need to have the TX gain set to 19 before i can reach 148XX on the rx gain of the second line. and when i do that, the sound quality is really poor. I have found 1 bug in the setup, is when i connect the first line to the milliwatt application, it only seems to be sending at 46XX power, on my digium card it is sending at 148XX. so the question is, how i can adjust the RX TX gain on this card because as of now, it is pissing me off a little bit, the Only answer i have got from Rhino is:

There was a net volume difference of about 26db in the recordings you sent. This is pretty drastic. You can tune your lines only so much before you have to call the telco which would be the next step. There may be a bad termination, old copper to or from the DMARK, a bridge tap, faulty shelf or any number of other factors at play. Essentially this is a wiring issue. Check your pairs make sure your terminations are good, check that you have no split pairs. If all your wiring checks out to the DMARK then the telco will have to work their side of the DMARK.

But i can't think of 4 line defect on the same client. it is really impossible. Can someone explain me exactly what i have to do and if someone know of a working test number, it would be really nice! Thanx a lot!

 

[Linetux]

Why don't you take advantage of the free tech support from Rhino and get this solved? They're some of the best, and they go above and beyond... you already paid for it!

 

[Speedy2k]

I have give them full access to the system, and they have done about nothing with it, i have asked them to know exactly how to tune the card, and they have refered me to the voip-info.org web site where they say the rx value should be 14844 approximately, and for my card it seems absoluetely impossible, since when i go this high, the souds is horrible, it does 1 week i try to make this work and i have got no help at all. I really think they should have a manufacturer tuning tutorial with a manufacturer milliwatt test line to make sure all the value are really perfect. but as of now, it impossible to have a 100% clear conversation with this card, it is really bad to say, but as of now, i have got a better service with digium, and this is exactly the reason i have switch to rhino, because the digium service was really poor. But as of now, rhino isn't good at all with that. The only thing i can got from them is link tu tutorial i have already try without success. So i'm asking here for some help! thanx!

 

[Linetux]

Hmmm.

Sorry to say, but ignoring Rhino's advice to having the telco come check the lines isn't going to get you anywhere. In my past experience, they really know their stuff - and they've solved issues for me in the past fairly quickly.

Now, that's not to say things haven't changed, but if it were me I'd take their advice, have the telco come out and check the DMARK and make sure you're getting what you think you're getting.

 

[Speedy2k]

Yea maybe, but what i tell them to look at ?? if there is no noise problem on the line, will they come out ??

 

[dghundt]

the rx value should be 14844 approximately, and for my card it seems absoluetely impossible, since when i go this high

when you use the monitor tool, you would adjust your rx gain to see this value on the output. Your are not setting your rx gain to 14844.
I would trust what rhino is telling you.
I had problems thinking it was my rhino card, but it was actually a headset. lol!

 

[james]

Thanks to all who use our stuff and to the two giving kudos the check is in the mail.

We got two call recordings on this and I don't recall the exact numbers but there was a net difference of 28db between RX and TX. I can say I have been doing this for years and have replaced a few dozen cards only for the customer to get the new equipment and have the same issue. There have been many cases where I have spent hours with a customer because no one else would just to have them finally give in and call the phone company and have there issue resolved. I was a field tech for several years I feel the pain and anxiety that comes with dealing with the telco. I was a NOC guy and also know the pain of having those field techs call in. The truth is most telco techs wouldn't make it in the sharp knife drawer but they are a necessary evil. That said you have to make sure its not between the DMARK and the card as that is not the telco's problem. If possible bypass your internal wiring completely and go straight to the DMARK this will clear or convict your inside wiring. I know it is hard on a live system but another option would be to take the system (or card in another system) off site to another location and get it on different copper.

 

[Speedy2k]

Ok, i'm gona try this! I hope it will be the inside wiring, because i don't know what to say to Bell Canada to have them check the line. If the line is still active and there is no noise on it, without a pair check to tell me exactly what's wrong, i don't think they will do anything about that.

 

[dghundt]

Like James said, you can try taking your system or card to another set of copper wires. Not sure how portable you are.
I find that when you don't know what is wrong, simple process of elimination is very helpful. At least you can tell your provider, "hey, I put my pbx on my home phone and it worked great. pls come out to the office and fix my lines."

 

[Speedy2k]

Is there any device to test those line for open pair, impedance, cable lenght etc etc ??

 

[etech3]

If you have used a cabling company to wire, they may have testers like Fluke that cat do a test for you.