| Author |
Message |
Ian
Guest
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 Posted:
Thu Sep 29, 2005 2:11 pm Post subject:
CONNECT speed |
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Why is it I have *never* seen the "CONNECT 300" string? I've
tried many different modems I have, but not one of them shows
"CONNECT 300" when connecting at 300 bps. Instead, the modems
only show "CONNECT" and no speed. But if I connect at 1200 bps
or higher, they show the correct speed.
Is "CONNECT" without the speed the same as "CONNECT 300"?
Thanks |
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BillW50
Guest
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| Posted:
Thu Sep 29, 2005 4:20 pm Post subject:
Re: CONNECT speed |
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"Ian" <ian@devnull.bin> wrote in message news:Xns96E034CAAED30iandevnullbin@208.49.80.188...
Date: Thu, 29 Sep 2005 09:11:31 GMT
| Quote: | Why is it I have *never* seen the "CONNECT 300" string? I've
tried many different modems I have, but not one of them shows
"CONNECT 300" when connecting at 300 bps. Instead, the modems
only show "CONNECT" and no speed. But if I connect at 1200 bps
or higher, they show the correct speed.
Is "CONNECT" without the speed the same as "CONNECT 300"?
Thanks
|
I believe that is normal.
--
Cheers!
______________________________________________
Bill (using a HP 8655c & Windows 2000)
--- written and edited with Outlook Express v6.00.2800.1123 |
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Moe Trin
Guest
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| Posted:
Fri Sep 30, 2005 5:25 am Post subject:
Re: CONNECT speed |
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In the Usenet newsgroup comp.dcom.modems, in article
<Xns96E034CAAED30iandevnullbin@208.49.80.188>, Ian wrote:
| Quote: | Why is it I have *never* seen the "CONNECT 300" string? I've
tried many different modems I have, but not one of them shows
"CONNECT 300" when connecting at 300 bps. Instead, the modems
only show "CONNECT" and no speed. But if I connect at 1200 bps
or higher, they show the correct speed.
|
See the modem manual - 300 bps (ITU v.21, and the equally ancient
Bell 103) was common many years ago. When the techs managed to
figure out how to do it at a screaming 1200 bps, the marketing
idiots decided that it was worth advertising this fact. Thus,
the CONNECT 1234567 stanza was something to brag about. Connecting
at a mere 300 bps was for peons who couldn't afford the higher
speed stuff, and should therefore be looked down upon.
| Quote: | Is "CONNECT" without the speed the same as "CONNECT 300"?
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"RTFM"
Old guy |
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Ian
Guest
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| Posted:
Fri Sep 30, 2005 6:14 am Post subject:
Re: CONNECT speed |
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On Fri, 30 Sep 2005 00:25:48 GMT, Moe Trin wrote:
| Quote: | Is "CONNECT" without the speed the same as "CONNECT 300"?
"RTFM"
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I had to do some serious searching, but I did the "FM". From
what I understand, "CONNECT" (without the speed) does in fact
mean a connection at 300 bps. However, the manual has no mention
about what is reported when connecting to a modem lower than 300
bps; say 110 bps. I guess I'll just assume it reports "CONNECT"
without any speed also... |
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Floyd L. Davidson
Guest
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| Posted:
Fri Sep 30, 2005 8:20 am Post subject:
Re: CONNECT speed |
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Ian <ian@devnull.bin> wrote:
| Quote: | On Fri, 30 Sep 2005 00:25:48 GMT, Moe Trin wrote:
Is "CONNECT" without the speed the same as "CONNECT 300"?
"RTFM"
I had to do some serious searching, but I did the "FM". From
what I understand, "CONNECT" (without the speed) does in fact
mean a connection at 300 bps. However, the manual has no mention
about what is reported when connecting to a modem lower than 300
bps; say 110 bps. I guess I'll just assume it reports "CONNECT"
without any speed also...
|
At 300 bps (or 115 for that matter) the connection does *not*
have a set speed! It is using FSK, and whatever rate the data
is fed to the modem at will be the rate the connection works at.
Almost any "300 bps" modem will also work at 450+ bps too, if
you can figure out how to get the computer port to transmit and
receive data at that rate, and some of them might work at 600
bps.
Higher speeds, however, are rate specific, and hence the term
"CONNECT 1200" *means* *exactly* *that*.
Hence the terminology is pedantically correct.
--
Floyd L. Davidson <http://www.apaflo.com/floyd_davidson>
Ukpeagvik (Barrow, Alaska) floyd@apaflo.com |
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Moe Trin
Guest
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| Posted:
Sat Oct 01, 2005 8:14 am Post subject:
Re: CONNECT speed |
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In the Usenet newsgroup comp.dcom.modems, in article
<87br2b3z5g.fld@barrow.com>, Floyd L. Davidson wrote:
| Quote: | At 300 bps (or 115 for that matter) the connection does *not*
have a set speed! It is using FSK, and whatever rate the data
is fed to the modem at will be the rate the connection works at.
Almost any "300 bps" modem will also work at 450+ bps too, if
you can figure out how to get the computer port to transmit and
receive data at that rate, and some of them might work at 600
bps.
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Way back in the cobwebs of another life, I remember a control and data
link on a TI Microwave Landing System (circa 1975) that used a Motorola
chip - I wanna say a MC6810, but I've not seen the hardware in nearly
20 years - that ran at 600 Baud FSK... 1070/1270 Hz in one direction,
2025/2225 Hz in the other as I recall. The Baud rate was set by strapping
pins on the chip. Bell 212, v.22, and v.22bis all used 600 Baud, but
they used fancy modulation schemes (DPSK for the first two, QAM for
v.22bis) to shovel the bits down the wire at multiples of the Baud rate.
This link was full duplex, and used manual nulling to separate the two
carriers.
But I still like my original answer (marketing hype) as a better answer.
Old guy |
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