Michael Polak wrote:
>
> I have to make second half of HP-LX <-> Siemens S35i cell
> phone cable myself, and I need to know if it should be
> straight cable or cross-connection cable. So far, it is
> beyond my imagination... :-(
>
> Laplink is probably crossed cable:
>
> ______ _____
> PC \/ PC
> ______/\_____
>
> Now, is the same cable used to connect modems to PC ?
> If no, my second cable would probably have to be crossed
> again, because cell phone is designed to behave the same
> way as modem, so the cable will be probably also the same...
1) The "crossed" cable is null modem. (i.e. no modem required)
2) The standard cable used to connect external modems is NOT crossed.
The "crossing" occurs in the modems.
3) The crossing is required for connecting two computer comm ports
together because BOTH computers have xmit data on pin 2 and recv data
on pin 3. so it's pretty obvious that if you want one to listen to what
the other says, xmit data on each must go to recv data on the other.
But this is not all. The handshake wires must be crossed too. :(
BTW, with comtool you should see the modem responses in command mode
whether the modem is internal or external.
If you send +++ATH it should say OK.
If it doesn't, the problem is in your communication to the internal modem.
- Clarence Verge
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