| 28.8 modems too fast for some Macs? 26 posts by 23 authors  | |
| | Russell Salerno | 2/15/95 |
possible for a 28.8 modem, (comm software port speed of 38.4 kbps,
modem connected in the 21.6-24 kbps range) to outrun the serial port
during a Zmodem file transfer?
If not, then why would setting the port speed to 19.2 (yet the modem
still connecting at roughly 21.6-24 kbps) eliminate the tons of errors,
retries etc I get when I run the port at 38.4?
+-----------------+
| Russ Salerno |
| rsal...@li.net |
+-----------------+
| | Eric J Uberseder | 2/19/95 |
barely functions at that level. You need to set it down a bot to limit
the speed of stuff coming in. Even though your modem is accepting it,
your transfer to your mac from the modem needs to be 19,200 to avoid
things backing up, and gettting lots of errors. Either a nubus upgrade
or a new mac(power pc) to do better.
Eric
| | Stuart R. Harper | 2/19/95 |
J Uberseder <zar...@grape.epix.net> wrote:
=>You serial port on the IIsi is at max out level at 38.4. Flow control
=>barely functions at that level. You need to set it down a bot to limit
=>the speed of stuff coming in. Even though your modem is accepting it,
=>your transfer to your mac from the modem needs to be 19,200 to avoid
=>things backing up, and gettting lots of errors. Either a nubus upgrade
=>or a new mac(power pc) to do better.
Or the other option is to turn off 'localtalk'. It seems that Net traffic
has a higher priority interrupt over modems traffic. Turning it off gets
you to 56kps with no problems of my slow SE/30s at work.
--
Stuart R. Harper 27-132/COE/Drexel U. stu...@lorelei.ece.drexel.edu http://e4tech1.ece.drexel.
"I'm a drunk-driver on the information super-highway." - Scott Bertch
"Hey man, 'D' is for DONE!" - Scott Bertch on senior year grading.
| | fre...@access.digex.net | 2/20/95 |
J Uberseder <zar...@grape.epix.net> wrote:
: You serial port on the IIsi is at max out level at 38.4. Flow control
how does a quadra 610 fare in this area? i currently set the flow at
57.6. i generally get 16.8kps on binary downloads at this setting. will
lowering the port speed allow me to boost performance somewhat?
-mark
--
Quaecumquae Vera Sunt
| | Stuart R. Harper | 2/20/95 |
fre...@access.digex.net wrote:
=>In article <Pine.SUN.3.91.950219151344.
=>57.6. i generally get 16.8kps on binary downloads at this setting. will
=>lowering the port speed allow me to boost performance somewhat?
=>
=>
=>-mark
1680 cps? If that's a 14.4 then you are approaching the maxtransfer speed
of the modem. If I may inquire, what terminal program are you using?
--
Stuart R. Harper 27-132/COE/Drexel U. stu...@lorelei.ece.drexel.edu http://e4tech1.ece.drexel.
"I'm a drunk-driver on the information super-highway." - Scott Bertch
"Hey man, 'D' is for DONE!" - Scott Bertch on senior year grading.
| | Marc St-Jean | 2/21/95 |
Unless your IIsi is running LocalTalk, there is no problems running
at 57k6. With LocalTalk on the printer port I agree with the 19k2
limit.
If you are using InterSLIP you will have problems since it doesn't
appear to support input hardware flow control. Even forcing input
flow control on with the CCL script has no effect.
Switch to MacPPP and you'll get great throughput.
Marc St-Jean <ma...@qcc.sk.ca>
QCC Communications Corporation
Saskatoon, SK (306)249-0220
| | Eric | 2/21/95 |
>
>how does a quadra 610 fare in this area? i currently set the flow at
>57.6. i generally get 16.8kps on binary downloads at this setting. will
>lowering the port speed allow me to boost performance somewhat?
I have ZTerm set to 38400 on my C610 and I get the same rates as
you and get the exact same thing when I have it bounced up to 57600bps.
I found that having it set to 38400 allows me to do things in the background
without having the transfer rate slow down as much. As an example, if I
would hold down the mouse button, I'd start getting zmodem CRC errors
if the rate is 57.6K. Mouse clicks and disk accesses seem to be handled
better at 38.4K.
Eric
--
Eric.Lorenzo@Colorado.EDU
| | W. Sugai | 2/22/95 |
Marc St-Jean <ma...@qcc.sk.ca> wrote:
>
>If you are using InterSLIP you will have problems since it doesn't
>appear to support input hardware flow control. Even forcing input
>flow control on with the CCL script has no effect.
what you said! please elaborate, since it sounds like hardware flow
control is not supported in interslip!
| | Kenneth Ho | 2/23/95 |
rsal...@li.net (Russell Salerno) wrote:
>possible for a 28.8 modem, (comm software port speed of 38.4 kbps,
>modem connected in the 21.6-24 kbps range) to outrun the serial port
>during a Zmodem file transfer?
>
>If not, then why would setting the port speed to 19.2 (yet the modem
>still connecting at roughly 21.6-24 kbps) eliminate the tons of errors,
>retries etc I get when I run the port at 38.4?
In my experience, all 040 Mac (duuno about PPC Macs) are not capable of
using V.34 modems, at least it cannot explore V.34's full capability. I get
tonnes of bad frames on my PPP connection even with only V.32bis on a
Quadra 650. And after I have installed a high speed serial card, it doesn't
happen anymore, not even a single bad frame for hours of connection.
--Best Regards
==============================
Opinions expressed here are personal. ¥ k...@hk.super.net
I have a dream of traveling with my love around the world,
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==============================
| | david s. broudy | 2/23/95 |
(Kenneth Ho) wrote:
< using V.34 modems, at least it cannot explore V.34's full capability. I get
< tonnes of bad frames on my PPP connection even with only V.32bis on a
< Quadra 650. And after I have installed a high speed serial card, it doesn't
< happen anymore, not even a single bad frame for hours of connection.
I'd question that; my IIci runs swell with a Supra V.34 modem at all
speeds up to 26.4bps with the port set to 57.6bps. Not one bad frame or
garbaged anything. I can't say it'll work at 28.8 because frankly I've
never gotten a connection at that speed... but your problem sounds like
something besides just a fundamental incompatibility.
--
bro...@mizar.usc.edu -- http://wpc-4.usc.edu/ /=/
Will
that be one lump, or two?
\=\ /=/
| | Freedom Rings | 2/24/95 |
LC!). I use a Sporster V.34 with no problems connecting at V.34 most of
the time. I don't have a high speed serial card, but I still get fairly
good transfer rates of around 3-4kbps... better with text files.
Wilfred
david s. broudy (bro...@mizar.usc.edu) wrote:
: In article <AB73243A...@guybrush.
: (Kenneth Ho) wrote:
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| | Amanda Walker | 2/24/95 |
> What's the fastest serial port speed supported by a IIsi? Is it
> possible for a 28.8 modem, (comm software port speed of 38.4 kbps,
> modem connected in the 21.6-24 kbps range) to outrun the serial
> port during a Zmodem file transfer?
Yes, if your screen is set to 256 colors. Flip it back to black & white and
it will increase serial throughput (the IIsi's video steals cycles from main
memory).
Amanda Walker
InterCon Systems Corporation
| | Skip Frank | 2/25/95 |
> In my experience, all 040 Mac (duuno about PPC Macs) are not capable of
> using V.34 modems, at least it cannot explore V.34's full capability.
Not mine. I have a Performa 635 with an 040. My Supra 288 works great.
Regularly connects at v.34/28,800. No problems at all. Occasionally
drops down to slightly lower speeds when the line quality isn't so good.
| | Luke Brennan | 2/25/95 |
Hey, we have a *pile* of 'em... will they go 28.8k??
------------------------------
Luke Brennan e-mail: L.Br...@cchs.su.EDU.AU
EDP Unit, S209 L.Brennan%cchs.su.edu.au@
Cumberland
College of Health Sciences,
,-_|\
The University of Sydney
voice: +61 2 646 6402 /
\
East Street, Lidcombe, NSW 2141 fax: +61 2 646 4853 \_,-._*
AUSTRALIA
v
| | Chuck Ross | 2/25/95 |
: So what about LC-II and LC-III's ?
: Hey, we have a *pile* of 'em... will they go 28.8k??
Yep!
chuck
+=============================
| "It's 106 miles to Chicago, we got a full tank of gas, | |
| half a pack of cigarettes, it's dark and we're wearing | |
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sunglasses!"
| "HIT IT!!" |
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Brothers" |
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+=============================
| | Russell Salerno | 2/26/95 |
I have a Daystar 50mHz '030 accelerator board installed. Daystar
claims it should have no problem handling up to 57.6. Of course, this
doesn't appear to be the case. But - I'm also running an Asante
enthernet board and a ethernet<>localtalk bridge extension, as well as
about a dozen other extensions. I guess I just don't have enough CPU
cycles to go around.
+-----------------+
| Russ Salerno |
| rsal...@li.net |
+-----------------+
| | Frank Meister | 2/26/95 |
I have just purchased a Supra 28.8 and am have not been able to maintain a
consistent connection speed while on. I have a dialup PPP account and am
using ppp2.1sd with a Quadra 950 040. I connect with my provider ok,
except throughout my time online my speed DROPS. For example tonight I
logged on and the display showed 21.6 then eventually it dropped to 9600
and never came back up. I have my settings at 34600 and have played
around with those a number of times to test connections. I have used flow
control DTS. Should I be using this flow control will that help? Also I
have downloaded serial switch 1.2 by Apple, a couple of people have said
this will allow the serial port to go beyond the 57600 limit on the Mac.
Does using the printer port make a better connection?
I am really wanting to make at least a 21,600 connection with this new
modem. Any ideas or experiences with this modem and ppp would be much
appreciated.
Thanks..
--
Live long and Prosper!!!
| | Walter Ian Kaye | 2/27/95 |
(Freedom Rings) wrote:
> LC!). I use a Sporster V.34 with no problems connecting at V.34 most of
> the time. I don't have a high speed serial card, but I still get fairly
> good transfer rates of around 3-4kbps... better with text files.
>
> Wilfred
>
Power Mac 6100/60, which does HWHS. How did you manage to get above 2400
on that GPi-less model? I want details! Heck, I studied pinouts, tried
dozens of init strings -- nothing worked. I even had Supra send me a
SECOND cable, thinking that maybe the included one was bad, but my LC and
modem refused to communicate via a HWHS cable (couldn't even get AT to
return "OK"). Only my old cable from SupraModem Plus would work on the
SupraFAXModem with my LC. When I bought my 6100 and hooked everything up
the same (but with the HWHS cable), then the HWHS cable worked!
HOW DID YOU DO IT?!?!?!?!?!?!?
-Walter :)
--
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
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| | Amanda Walker | 2/27/95 |
> what you said! please elaborate, since it sounds like hardware
> flow control is not supported in interslip!
Hardware flow control is supported in InterSLIP, but only for output (this is
a known bug in the current version of InterSLIP).
Amanda Walker
InterCon Systems Corporation
| | Moxie | 2/27/95 |
original item) and I get a perfect v.34 28.8 connection every time with a
serial rate of 28800. Of course I can't use the 115200 serial rate...so
I can't do data compression, but I *AM* getting 28.8.
-Mox
--
_____ _____ _____ __ _____
| | | | |__| ___| Moxie mo...@mox.liii.com
| | | | | |- -| | ___| mo...@oak.liii.com http://www.liii.com/~moxie
|_|_|_|_____|__|__|__|_____| If you want a coolsig like this, mail me.
| | Maureen Highkin | 2/28/95 |
> original item) and I get a perfect v.34 28.8 connection every time with a
> serial rate of 28800. Of course I can't use the 115200 serial rate...so
> I can't do data compression, but I *AM* getting 28.8.
I'm afraid I don't know very much about Mac hardware, but I have been
reading this thread with great interest. I have a Mac Classic 4/40 (the
origional with 68000 processor) and have been having some problems getting
my Practical Peripherals MC288MT V.FC modem to connect at speeds higher
than 14400. Is there some kind of limitation on my Mac? If so, I'll stop
beating my head against config PPP. Thanks for any imput.
Maureen
| | DctrHappy | 2/28/95 |
I am not familiar with your modem but i may have something to say. Is it
possible that you are setting your port speed too low?? What I mean is,
do you tell your terminal program (zterm, etc.) that you want hispeed?????
If not, it may default at 14.4. or whatever... Good luck.
Send E-Mail to: dctr...@aol.com
------------------------------
---- "we must separate the knower from the known."
| | Paul Hiscocks | 2/28/95 |
area. I am using the same with no problems. Keep flow control off.
In article <fmeister-270...@
fmei...@sam.neosoft.com (Frank Meister) wrote:
--
An APPLE a day keeps the PENTIUMS away!
| | dpa...@skyblu.ccit.arizona.edu | 3/6/95 |
while then-current Macs had a given maximum serial port data rate (DTE speed
when internally clocked--as they usually are--) that when _externally clocked_
their maximum speed was _much_ higher.
Is this so, and is this of any practical use to those with "older" Macs who are
considering v.34 modems ?
Don Palik
dpa...@ccit.arizona.edu
********************
In article <mkhigh-27...@c0_s2_
| | Steve Lundin | 3/8/95 |
Highkin, mkh...@ccmail.monsanto.com writes:
>I'm afraid I don't know very much about Mac hardware, but I have been
>reading this thread with great interest. I have a Mac Classic 4/40 (the
>origional with 68000 processor) and have been having some problems
getting
>my Practical Peripherals MC288MT V.FC modem to connect at speeds higher
>than 14400. Is there some kind of limitation on my Mac? If so, I'll stop
>beating my head against config PPP. Thanks for any imput.
No, there may not be anything wrong with your Mac. Connections at 28.8
can be more dependent on your house wiring and other electrical devices
in the neighborhood of your modem. Also, remember the modem carrier can
be independent from the computer to modem data rate. The computer needs
to be able to handle data at the max rate of the modem if you want max
performance. However, if the modem tries to send data too fast to the
computer and you have hardware handshaking working correctly, the
computer will signal the modem to stop sending until the computer can
handle more data. Regarding the phone lines, the phone company is not
required to provide lines that can support even 9600 bps. It just so
happens that most of America's phone system will handle higher data
rates. I don't know of a simple test to determine why you can't make
repeatable high speed connections. Bummer.
| | drdos | 3/9/95 |
: : So what about LC-II and LC-III's ?
: : Hey, we have a *pile* of 'em... will they go 28.8k??
: :
I hope so, I use to run 38.4k null modem connections from a MacII 8/80
system and got in the 2800-3000 cps or so on it... (020/16) so I hope my
and other newer macs can do it... haha