Broken US Robotics 5637 USB modem

  • Thread starter Thread starter Man-wai Chang ToDie (33.6k)
  • Start date Start date
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Man-wai Chang ToDie (33.6k)

I have tested both the inner 2 pins and outer 2 pins. Both resulted in
"NO DIALTONE".

Should I just send it back to get a replacement?

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I have tested both the inner 2 pins and outer 2 pins. Both resulted in
"NO DIALTONE".

Should I just send it back to get a replacement?
Click to expand...

Have you tried disabling dial tone recognition?
 
Have you tried disabling dial tone recognition?
Click to expand...

have you tried the other pin combinations too? I had one once that
needed an odd combination to work.

A dialup modem doesnt need to recognise the dial tone to work, so its
not really an issue.


NT
 
Marty said:
Have you tried disabling dial tone recognition?
Click to expand...

yes, ATX1, and no response from the modem.

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have you tried the other pin combinations too? I had one once that
needed an odd combination to work.

A dialup modem doesnt need to recognise the dial tone to work, so its
not really an issue.
Click to expand...

Not yet. You meant the modem is using pin combination other than 1-4 and
2-3? What country is using odd combination?

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Not yet. You meant the modem is using pin combination other than 1-4 and
2-3? What country is using odd combination?
Click to expand...

I dont know what you mean. I had one modem that required 3 wires
connected, and in different order to the standard lead. As already
explained.


NT
 
I have tested both the inner 2 pins and outer 2 pins. Both resulted in
"NO DIALTONE".

Should I just send it back to get a replacement?
Click to expand...

So you have the newer style RJ11 plugs and sockets, not the older
6-way BT sockets as in the following article?

http://web.ukonline.co.uk/freshwater/pst1.htm

If RJ11, then you should be using the inner 2 pins, not the outer 2.

If you have an old internal modem card, plug it into the phone system
(you don't need to install it into a PC), and measure the voltage
between the two inner pins at the rear of the RJ11 socket.

- Franc Zabkar
 
If RJ11, then you should be using the inner 2 pins, not the outer 2.
If you have an old internal modem card, plug it into the phone system
(you don't need to install it into a PC), and measure the voltage
between the two inner pins at the rear of the RJ11 socket.
Click to expand...

What should be the voltage if the modem goes off-hook over the inner 2
pins? I tried it once, the multimeter (cheap one) read nothing....

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I dont know what you mean. I had one modem that required 3 wires
connected, and in different order to the standard lead. As already
explained.
Click to expand...

3 wires??? HK's phone uses pins (2,5) on the 6-pin wide plug on the
socket end. On the phone end, it's pins (3,4).

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I dont know what you mean. I had one modem that required 3 wires
connected, and in different order to the standard lead. As already
explained.
Click to expand...

Mind to tell me which 3 pins?

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What should be the voltage if the modem goes off-hook over the inner 2
pins? I tried it once, the multimeter (cheap one) read nothing....
Click to expand...

At my locale the on-hook voltage is 52V, off-hook approximately 10V or
less. A telephone might drop the voltage to 20V when off-hook.

- Franc Zabkar
 
At my locale the on-hook voltage is 52V, off-hook approximately 10V or
less. A telephone might drop the voltage to 20V when off-hook.
Click to expand...

Could I measure that by not connecting the modem to the phone socket,
that is:

1. connect the modem to the USB port
2. connect the inner 2 pins to a multimeter
3. Issue "ATDT12345678" command to the USB modem

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3 wires??? HK's phone uses pins (2,5) on the 6-pin wide plug on the
socket end. On the phone end, it's pins (3,4).
Click to expand...

Then you need to obtain a cable that connects pins (2,5) at the HK
phone socket (that's where you measure 52V) to the middle two pins of
your modem's 4-pin RJ11 socket. Can't you buy some kind of adapter
that converts between the old and new systems?

Here's one:
http://www.homestead.co.uk/CategoryImages\BTMDl.jpg
http://www.homestead.co.uk/productcategorydetail.aspx?categoryid=53742

- Franc Zabkar
 
Then you need to obtain a cable that connects pins (2,5) at the HK
phone socket (that's where you measure 52V) to the middle two pins of
your modem's 4-pin RJ11 socket. Can't you buy some kind of adapter
that converts between the old and new systems?
Click to expand...

Already tried it. Pins 2-5 at jack, pins 3-4 at modem. NO DIALTONE.
Is the polarity of the 2 pins important?

BTW, I just found that the 32-bit driver at US Robotics DOES NOT work
for my WinXP. The 64-bit driver seems to be working. Something fishy....
 
3 wires???
yes
Click to expand...

Pin number of the 3 wires are: ???


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Man-wai Chang ToDie (33.6k) said:
Pin number of the 3 wires are: ???
Click to expand...

http://en.wikipedia.org/wiki/BS_6312

"Strictly speaking, a textbook installation will only actually use
pins 2, 5 (for the voice) and 3 (for the ringer). Having said this,
most modern telephones contain their own ringing capacitor, to cater
for badly wired extensions, which means you can usually run your
extension wiring with only pins 2 and 5. Often where multi-core
cable is used, the remaining cables are used for wiring extensions
on additional incoming telephone lines."

That would suggest the third wire carries only ringing, and the
modem is not looking for ringing in your case. It is trying
to find dial tone, presumably on 2 and 5, or whatever pair of
signals is wired in your region.

Paul
 
Could I measure that by not connecting the modem to the phone socket,
Click to expand...

No, the voltage comes from the batteries at your local telephone
exchange (or CO as the Americans call it).

- Franc Zabkar
 
Already tried it. Pins 2-5 at jack, pins 3-4 at modem. NO DIALTONE.
Is the polarity of the 2 pins important?
Click to expand...

No, the modem (and your telephone or fax) has a bridge rectifier that
takes care of reverse polarity.

If you have access to the pins in your jack, measure the voltage
between 2 and 5 with your modem disconnected and then repeat it after
connecting your modem. Then issue a dial command and watch for a
voltage drop.
BTW, I just found that the 32-bit driver at US Robotics DOES NOT work
for my WinXP. The 64-bit driver seems to be working. Something fishy....
Click to expand...

Since yours is a hardware modem, the driver would only need to handle
the USB interface. If it were a softmodem with a silicon DAA, then the
driver would need to know how to talk to the host side DAA chip. If it
didn't know how to do this, then it could not command it to go
off-hook, in which a NO DIALTONE response would be the likely outcome.
However, since your modem has its own DSP and controller, then the
controller can interpret the ATDT dialling command and control the DAA
on its own. So, yes, something doesn't look right.

- Franc Zabkar
 
I got rid of it many years ago, no idea. As I said several posts up,
if you cut a lead you can try all combinations to see if one works.
Such odd modems are unlikely to be common, but they do exist. They
must have sold with a nonstandard lead when new.

http://en.wikipedia.org/wiki/BS_6312

    "Strictly speaking, a textbook installation will only actually use
     pins 2, 5 (for the voice) and 3 (for the ringer). Having said this,
     most modern telephones contain their own ringing capacitor, tocater
     for badly wired extensions, which means you can usually run your
     extension wiring with only pins 2 and 5. Often where multi-core
     cable is used, the remaining cables are used for wiring extensions
     on additional incoming telephone lines."

That would suggest the third wire carries only ringing, and the
modem is not looking for ringing in your case. It is trying
to find dial tone, presumably on 2 and 5, or whatever pair of
signals is wired in your region.

    Paul
Click to expand...

and the 4th wire is a spare. Nonetheless it wouldnt work (outgoing) on
any combination of 2 wires, only 3.


NT
 
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