Tandata Modem BT plug to RJ11

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Cristian
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Tandata Modem BT plug to RJ11

Postby Cristian » Thu Apr 30, 2020 10:31 pm

Hi,
I'm trying to make a BT to RJ11 (Italian telephone) adapter for Tandata Q MOD modem. I'm not experienced about modem signals, and unfortunately the information from the Internet are not always clear and sometimes contradictory. The adapter I quickly made does not seem to work... I attach here below the wiring scheme. Could someone give me suggestions please?
And which is the best software for Tandata modem to be used with QL+SGoldcard or QL+Trumpcard?
Thank you in advance.

Image


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Re: Tandata Modem BT plug to RJ11

Postby Derek_Stewart » Thu Apr 30, 2020 10:39 pm

Hi Cristan,

What is the dfintion of the Italian telephone wiring?


Regards,

Derek
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Re: Tandata Modem BT plug to RJ11

Postby Pr0f » Thu Apr 30, 2020 10:53 pm

This is the uk wiring on the 'master' socket - only 2,3 and 5 are used - 2 and 5 carry the 48v line, and pin 3 carries the ringing signal:

http://www.wppltd.demon.co.uk/WPP/Wirin ... phone.html


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Cristian
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Re: Tandata Modem BT plug to RJ11

Postby Cristian » Fri May 01, 2020 9:34 am

Derek_Stewart wrote:What is the dfintion of the Italian telephone wiring?


Here are some diagrams I found for Italian RJ11 connector. Unfotunately they are in Italian, anyway the colors for the cable should help. I hope they are understandable; if not, I'll try to translate.
It seems only 2 wires in the middle are connected, but the modem cable has 4 wires. The "seize" Led is constantly on, and the "QL Terminal" software says "offline" and "waiting for carrier".

Image


The following is a phone socket diagram. The yellow wire is described as "not used", the black wire is described as usually not connected, only utilized to "take the outgoing signal in serial configuration lines":
Image


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Re: Tandata Modem BT plug to RJ11

Postby XorA » Fri May 01, 2020 10:22 am

Cristian wrote:Hi,
I'm trying to make a BT to RJ11 (Italian telephone) adapter for Tandata Q MOD modem. I'm not experienced about modem signals, and unfortunately the information from the Internet are not always clear and sometimes contradictory. The adapter I quickly made does not seem to work... I attach here below the wiring scheme. Could someone give me suggestions please?
And which is the best software for Tandata modem to be used with QL+SGoldcard or QL+Trumpcard?
Thank you in advance.

Image


This looks correct from my limited knowledge.

Did the Tandata have dial tone detection, I used to have to turn that off on old modems when connected to modern phone systems?

Only 2 wires are needed, 2,5 in the UK 6 pin plug. Bell wire is only there to support old rotary phones :-D


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Re: Tandata Modem BT plug to RJ11

Postby pjw » Fri May 01, 2020 1:01 pm

Cristian wrote:Hi,
I'm trying to make a BT to RJ11 (Italian telephone) adapter for Tandata Q MOD modem. <>

My brother is an international traveller. Im sure he knows no more of electronics than the authors of the Bible. Back in the day when telephone modems were the norm, wherever he was in the world he always seemed to be able to connect up. Ive frequently watched him at work:
The far end of his modem cable was just the stripped wires. If possible hed get a local plug, plug it into the telephone socked and strip the wires off the other end, and then (to my horror!) hed fiddle around with the wires until his modem sounded the dial tone. Bingo!
I dont know whether he ever blew up a telephone exchange or anything drastic, so I couldnt possibly recommend it......


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Re: Tandata Modem BT plug to RJ11

Postby RalfR » Fri May 01, 2020 1:11 pm

Hmm, in Germany, there are just two wires to connect from the line. Which connections have I to use? I always use just two for my ZyXel.


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Cristian
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Re: Tandata Modem BT plug to RJ11

Postby Cristian » Fri May 01, 2020 5:10 pm

pjw wrote:I dont know whether he ever blew up a telephone exchange or anything drastic, so I couldnt possibly recommend it......

It's official: your brother is my hero :-) I wish I were so courageous


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Re: Tandata Modem BT plug to RJ11

Postby Cristian » Fri May 01, 2020 5:19 pm

Thank you XorA for your suggestions.
Many new questions come to my mind: the two needed wires may be inverted? Should I keep the other 2 wires or should I cut them?
I'll do some tests.


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Re: Tandata Modem BT plug to RJ11

Postby tofro » Fri May 01, 2020 6:07 pm

Cristian wrote:Thank you XorA for your suggestions.
Many new questions come to my mind: the two needed wires may be inverted? Should I keep the other 2 wires or should I cut them?
I'll do some tests.


Cristian,

polarity shouldn't normally matter, at least not with devices that follow the standard.

You seem to be expecting something to change (in your status LEDs or your terminal program) when the modem is properly connected to the phone line.
That expectation is wrong - You will only see "on line" when the modem is actually connected to a proper far end modem.

Tobias


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