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echo: aust_modem
to: Liam Jordan
from: Richard Malcolm-SMith
date: 1996-01-25 22:53:46
subject: Mobile Modems

Liam Jordan wrote in a message to All:

 LJ> Herez a couple of questions:

 LJ> (1) If I had a laptop with one of those cellular modems,
 LJ> would I get really fast connections because it's connected
 LJ> to a digital network? 

If you are talking a GSM mobile, then no, they are limited to 9600, the
"Modem" is really just a digital interface to the phone, and is
useless on normal phonelines.

I was suckered in by bellsouth in new zealands BS (BS=Bellsouth, or
BullS... - Quite appropriate!) advertising saying that digital was better.
It is not. My advice is to get a motorolla analog flip/pocket classic for
next to nothing (They are practically giving them away in NZ with a 12
month contract to whatever cell provider the cell phone seller is
connecting to )and a PCMCIA modem, you can use it as a 28k on your home
lines, and upto about 19k--24k on the road. BS justify there lower BPS
rates with a lower per minuite charge.

Oh yeah, and don't try to run a analog modem thru a GSM cell phone, You may
get a 1200 connect with heaps of errors. the audio quality of the GSM
network is appauling when compared with the analog network and does not
support analog modems thru it. I am thinking of returning my nokia 2110 and
getting a analog phone.

I am ashamed to have fallen for the "Digital=good" BS (BS = BullS...)

 LJ> (2) Why is the CRC check really sensitive on my computer
 LJ> when downloading via ZMODEM?. When it's writing to the hard
 LJ> drive, everything is going fine, but when it takes longer
 LJ> than it should (ie. moving the heads great distances across
 LJ> the disk), I get CRC errors. The same thing occurs while
 LJ> using SMARTDRIVE as well. Could someone please help me here

Because your modem is not fitted with a burrered uart, and during the time
that the HDD is writing, it disables interupts, so the character is lost
and replaced with another one by the time the HDD write is finished. Don't
use a write cache program, and see if your termanal has something along the
lines of lower CTS on disk writing, If so, that will work by telling the
modem to "Shut up and wait for a mo... The modem will stash all the
data it's recieving in its little bit of memory, untill the write is done
and the computer can recieve the data without loseing it.

Otherwise try turning off the caching in your cmos setup, and see how that
goes (Re enable it after!!).

>>Cya

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