Baslinux mailing list

[Samual Acorn <sam.acorn AT gmail.com>]

On 28/12/05, sindi keesan <keesan AT sdf.lonestar.org> wrote:
> I have two modems and was using the same init string with both (S15=128
> added).  Both are USR but only one is apparently Sportster.
>
> The S15=128 disabled MNP in the Sporster, but was enabling it in the other
> USR.  I changed that init string to AT&F1 (specific to USR, hardware flow
> control)  Now they are both V42bis (eznet log) and the non-Sportster has
> doubled its upload speed.  They both connect at 50666/31200.

MNP should have been disabled by default.... useless in todays world...

>
> S32=34 stops the Sportster from trying to connect with SX2 but has no
> effect on the other USR.
>
>
>
> A comparison of ati output reveals the internal non-Sportster is a bit
> newer.  It uploaded a bit faster, but the Sportster had a higher actual
> peak speed for download.
>
> ati6 - gave the upload and download speeds, 50666/31200 for both, but the
> external actually connected at 53333 and this was the peak speed.
> How can it run faster than it connected?

the initial connect speed is an idea... not an absolute... the modem
will change speeds (up and down) throughout the connection as line
conditions change...


>
> ati7:
>
> Non-sportster:  FLASH date 4/22/98, 4.7.35
> V32bis, V80, V34+, X2, V90
> Why is V42bis not listed?

probably doesnt support it(or a lazy programmer didnt add it to the
ATI string reply).... and is using v34 rather than v42 if you disabled
MNP... check for upgrades...

>
> Sportster:  2/24/98, 4.9.1 (which I added to get V90, the modem is
> labelled X2 and is 1997)
> V32bis, V34+, X2, V90
>
> ati9:
> Non-sportster:  1.0USR3090  PNPC10F - larger number so newer
> Sportster:  1.0USR3040 PNPC107
>
> The internal modem is probably from 1998, and the external one is from
> 1997 and was upgraded with a file from earlier in 1998 and this might be
> why it is slightly slower, because of older hardware and/or software.
>
> Did post 1998 modems eliminate MNP?  Most of ours are 1997 because we got

they didnt elimitate it... but use it as a fallback if the modem on
the other end of the line doesnt support v34 v44 or v42... actually
all modems that support at least v42 should... but  yours seem not
to.... are you sure they are using v42? if they only support v34 then
they will try to use MNP....

> them free as 33.6K, and upgraded.  They need to be X2 to start with before
> you can upgrade to V90, not just 33.6K.  1997 was the year of three
> standards, after which only V90 or V92 (or ?).  What was the third, 56
> Flex?

x2 and flex were the starters... they were proprietary... not
standards... v90 was the standardized version (using the best parts of
both) and v92 is a recent addition adding faster uploads(pcm upstream)
and better compression(v44)....

>
> The moral - check eznet log for MNP and look for a way to disable it so as
> to get V42bis to double upload speeds.  You can find manufacturer-specific
> init strings online.

sometimes its best to roll your own init string....

>
> Is average speed 3040 CPS the most you can expect from 31200 bytes/sec
> upload speed?  I get about 5K/sec downloads for 50666 download speed.

sounds about right...

what are the model numbers of your modems? (sticker on the modem)


>
> Sindi
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>


--
--sam
http://mephitus.renamon.org/
"When you've done something right, no one will be sure you've done
anything at all." -- Futurama
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