Nokia 6160 and cellular modems
I have great success with Nokia 6160, IBM (XJACK OEM) pcmcia
card (33.6) and nokia/3com cables.
Yes it runs in analog mode, yes it runs down the battery
pretty fast. But I only use it in an emergency when a land
line is not available. I set it to 9600 baud. Hook up the rapid charger to help me fight the battery drain.
I am only dialing directly into my AIX box and using a nice dumb vt100/dos setup. Like I said for emergencies its OK.
Here's my question:
I've tried switching to a 3Com xjack
3xcm756 (56k) and can't connect. I'm still using dumb vt100
and 9600 baud but the change to 3com-56k has caused the modems to fail the negotiation.
The other modem on the AIX is micom delporte (?).
Any suggestions??
Up to now I've relied on the modem setting up by itself. The docs say inserting the nokia cable tells the modem to switch to cellular settings.
thanks ... joe.f.
P.S. I prefer that its analog. It appear like just another voice call and I don't get charged for data mode.
vt100 Solutions and Ideas
I assume that you are trying to use the modem with a cellular phone such as
a Nokia:
As Mark knows, after some moderately successful tests I gave up on using my
modem with a conventional cellular phone because of difficult making
connections and low performance. Still, I think I have some suggestions from
my experience that may help. And if you are just using vt100 terminal
emulation you won't have as much trouble with performance as I did sending
TCP/IP over the link.
1. All current modems do baud-rate conversions so setting your terminal
emulator or serial port to 9600 won't make any difference. Instead, you have
to send an "AT" command to the modem to limit its speed. This command must
be sent before dialing the connection. Most terminal emulators have a place
where you can specify a setup screen or you can simply type it by hand
within the terminal emulator before dialing. You'll have to consult your
modem documentation to find the right code. With a cellular connection I
recommend starting with 4800 bps and then trying 9600 later.
2. Check on the configuation of the modem you are dialing into. Ideally, it
should be "cellular compatible" even though it is connected to a
conventional POTS line. Cellular compatible modems use special protocols to
improve reliability and tolerate momentary interruptions as your cellular
phone crosses between cells.
3. A problem I had when dialing into Internet Service Providers is that
their modems were often configured not to accept connections at lower
speeds. This configuration was inconsistent depending on which modem in the
pool I happened to get when dialing in. So this is another issue to check on
the receiving end.
Finally, just a warning: Using a modem cable with a cellular phone such as
the Nokia models forces the phone into analog mode. Apparently the modem
doesn't work well if its tones have to be digitized by the phone. Analog
cellular uses the battery much faster than digital so you'll need to watch
your battery and maybe keep a spare around.
Good luck!
BR