| From: | Bill Eaves |
| Date: | 17 Aug 2001 at 14:22:49 |
| Subject: | Re: Modem cable |
Hello Glyn
On 16-Aug-01, Glyn Astill wrote:
> I have My P.C phone and amiga connected to the phone
> socket, the P.C will dial up OK and the cable from the
> modem to the phone socket is fine, Ive tested it on
> the P.C. When I try to dial the modem makes a click
> noise and then a long buzz while it trys to find a
> dial tone then it stops.
I had that once.
The answer is that there are two different types of modem cable. I used to
use a Motorola 3400 and before that an ACEEX 14.4k. These came with modem
cables and over the years I had built these into long extensions so that
they would reach the phone socket in another room. However, as soon as I
got a Microlin 33.6k it would never get a dial tone. I tried it with its
own short modem cable with the Miggy next to the phone socket and it
worked.
Investigation showed that two wires needed to be crossed to get it to work.
Of course then the older modems would not work with that cable.
It turns out there are two types, a UK one which the Microlin uses and a US
type which is more common. The difference is in one the wires are connected
straight through and in the other two wires cross. Check which one you
currently have using a multimeter and then order a cable that is opposite.
Maplin do them:
BT to US telephone plug conversion Cord (wires crossed) is order code RZ75S
BT to US extension cord (wires straight through) is order code BD00A
Both are £3.99 and both have a BT phone connector on one end and a modem
RJ11 on the other. Unless you check with a multimeter both look identical
which is quite likely what your problem is due to. You will need to check
your current able as though I know what cables my three modems need I don't
know what a USR sportster would.
>The modem is a USR sportster
> 14.4 sportster, the PSU I'm using is one of those
> generic ones you get for a couple of quid (Has plenty
> of power tho' its 1.2A and goes up to 15V), I noticed
> the modem does the same no matter what the polarity of
> the input, is this OK??
Modems usually use an AC power source so the polarity does not matter.
Regards,
Bill.
PS. One for Neil. Any idea why my 33.6k Microlin will never connect above
28.8k even though the phone line has been recently cleared up and is
cleaner than ever ?
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