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Stef Sternov

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Nov 26, 2001, 6:13:20 PM11/26/01
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Hi,
I've just installed an Hayes Accura (08-15357) PCI V92 internal fax/modem.
It seems reliable but not fast.
Can anyone recommend a string (or strings to try) to improve the speed.
My ISP supports V92.
Download speeds are the most important to me.

Thanks
Steve


Rick Collins

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Nov 26, 2001, 6:46:36 PM11/26/01
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"Stef Sternov" <steve...@ntlworldREMOVE.com> wrote in message
news:w0AM7.18784$i37.2...@news6-win.server.ntlworld.com...

There is no magic init string. Commands can be used to _limit_ connect
speed, but not to _increase_ the speed the modem determines it can
use.

Sorry.

Grizzly

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Nov 30, 2001, 6:09:03 AM11/30/01
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"Rick Collins" <r..collins@sympatico.ca> wrote in message news:<wyAM7.5400$3i2.9...@news20.bellglobal.com>...
oh, i dont know bout that :)
s91 register anyone?

Franc Zabkar

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Dec 1, 2001, 3:30:03 PM12/1/01
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On 30 Nov 2001 03:09:03 -0800, driven...@telstra.com (Grizzly) put
finger to keyboard and composed:

I once experimented with S91 using two directly connected modems and
found that changing the transmit level at the calling modem did not
appear to affect the receive level at the remote modem:

http://groups.google.com/groups?hl=en&selm=399e3fb9.444318%40news.ozemail.com.au

Experimenting with my own ISP (dingoblue), using the min (-15dBm) and
max (-10dBm) allowable S91 settings, I get the following results
(Rockwell AT&V2 post-call report):

S91=15
Signal Level (TX/Power Drop), -dB : 15/0
Remote power drop support : ON

S91=10
Signal Level (TX/Power Drop), -dB : 10/0
Remote power drop support : ON


Using a different ISP (Bigpond) I get the following:

S91=10
Signal Level (TX/Power Drop), -dB : 15/1
Remote power drop support : ON

S91=11
Signal Level (TX/Power Drop), -dB : 15/2
Remote power drop support : ON

S91=12
Signal Level (TX/Power Drop), -dB : 15/2
Remote power drop support : ON

S91=15
Signal Level (TX/Power Drop), -dB : 15/2
Remote power drop support : ON


A third ISP (OzEmail) produces these results:

S91=15
Signal Level (TX/Power Drop), -dB : 15/0
Remote power drop support : OFF

S91=10
Signal Level (TX/Power Drop), -dB : 10/0
Remote power drop support : OFF

I'm not sure how to interpret these data but it appears that the
calling modem can adjust its transmit level to suit the line
conditions, irrespective of the setting of S91, if the remote modem
allows it.

Anyway, the bottom line for me is that my min/max Tx/Rx speeds do not
appear to be affected by changes to S91.


-- Franc Zabkar

Please remove one 'g' from my address when replying by email.

BruceM

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Dec 4, 2001, 9:48:27 PM12/4/01
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Hi Franc,
BruceM here. We had a decent thread going some time ago about authorization
timeouts on bigpond.
Finally decided to try another ISP who uses same setup as Bigpond (0198
number). www.internode.on.net is Sth Aussie wide. Had similar probs as
bigpond and was about to call it quits when telco got me to try s91=14.
Seems to have stabalized the dropouts and pauses (lockups?) Telstra says
this setting is illegal in Aust., any opinion???
BruceM.......

Franc Zabkar <franc...@dinggoblue.net.au> wrote in message
news:3c08a19a...@news.dingoblue.net.au...

Franc Zabkar

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Dec 5, 2001, 4:50:49 AM12/5/01
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On Wed, 5 Dec 2001 13:18:27 +1030, "BruceM" <bruc...@hotmail.com>

put finger to keyboard and composed:

>Hi Franc,


>BruceM here. We had a decent thread going some time ago about authorization
>timeouts on bigpond.
>Finally decided to try another ISP who uses same setup as Bigpond (0198
>number). www.internode.on.net is Sth Aussie wide. Had similar probs as
>bigpond and was about to call it quits when telco got me to try s91=14.
>Seems to have stabalized the dropouts and pauses (lockups?) Telstra says
>this setting is illegal in Aust., any opinion???

Telstra are clueless. My Austel approved 56K modem defaults to a
setting of S91=10, as did my previous 33.6K modem. Note that the units
for S91 are -dBm, so S91=14 is actually a lower transmit level than
the default. Furthermore, my Rockwelloid prevents me from choosing any
higher settings in the range 0-9, ie 10 is the maximum.

Nico Kadel-Garcia

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Dec 5, 2001, 8:00:40 AM12/5/01
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"Franc Zabkar" <franc...@dinggoblue.net.au> wrote in message
news:3c0dec63...@news.dingoblue.net.au...

Umm. This number represents dB attenuation of the output signal level. Doe
these different modems have the same base signal level? Or does the Rockwell
modem, for example, have a smaller standard output and thus attenuation is
*supposed* to be 10 dB only?


Richar...@p0.f235.n254.z2.fidonet.org

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Dec 5, 2001, 4:34:03 PM12/5/01
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-=> Quoting Franc Zabkar to Grizzly <=-

FZ> I once experimented with S91 using two directly connected modems and
FZ> found that changing the transmit level at the calling modem did not
FZ> appear to affect the receive level at the remote

Analog modems have their own AGC circuitry. And are operated best leaving
them to level their own line inputs

FZ> modem:
FZ> calling modem can adjust its transmit level to suit the line
FZ> conditions, irrespective of the setting of S91, if the remote modem
FZ> allows it.
FZ> Anyway, the bottom line for me is that my min/max Tx/Rx speeds do not
FZ> appear to be affected by changes to S91.

You've still got your line's AGC switched on at your local exchange?

Richard

... | BBS +44(0)20 8297 2486 24 hours |

--- FMail/386 1.02
* Origin: Another message via PackLink +44(0)2082972486 (2:254/235)

Franc Zabkar

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Dec 5, 2001, 5:34:05 PM12/5/01
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On Wed, 05 Dec 2001 13:00:40 GMT, "Nico Kadel-Garcia"
<nka...@bellatlantic.net> put finger to keyboard and composed:

The term dBm represents a unit of power referenced to 1 milliwatt.

See this explanation:
http://www.tpub.com/neets/book16/67.htm

Examples:

0dBm = 1mW
-3dBm = .5mW
-10dBm = .1mW
-15dBm = .03mW

I would expect that this power level is that which is present at the
DSP, not at the tip and ring outputs of the DAA.

Franc Zabkar

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Dec 6, 2001, 3:36:06 AM12/6/01
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On Wed, 05 Dec 2001 21:34:03 GMT,
Richar...@p0.f235.n254.z2.fidonet.org put finger to keyboard and
composed:

> -=> Quoting Franc Zabkar to Grizzly <=-


>
> FZ> I once experimented with S91 using two directly connected modems and
> FZ> found that changing the transmit level at the calling modem did not
> FZ> appear to affect the receive level at the remote
>
>Analog modems have their own AGC circuitry. And are operated best leaving
>them to level their own line inputs

I suspect that the initial Tx/Rx signal levels are negotiated during
training, with subsequent fine control being provided by AGC hardware.


Notice in my previous post that the negotiated Tx level for calls to
Bigpond was always -15dBm (the lowest), irrespective of the setting of
S91 (10-15). OTOH, connections to other ISPs did not result in changes
to the Tx level. I can't see how this behaviour can be attributed to
AGC. If anything, AGC would be applied to the Rx signal at the remote
modem, not to the Tx signal at the calling modem.

> FZ> modem:
> FZ> calling modem can adjust its transmit level to suit the line
> FZ> conditions, irrespective of the setting of S91, if the remote modem
> FZ> allows it.
> FZ> Anyway, the bottom line for me is that my min/max Tx/Rx speeds do not
> FZ> appear to be affected by changes to S91.
>
>You've still got your line's AGC switched on at your local exchange?

Is this a question or a statement? In any case, I have little idea
about what goes on inside the exchange.

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