>I know this isn't a Portmaster problem, but I thought I could throw this
>out and see what you users think.
>
>I have a network dial-in customer using Windows 95 and a USR Speedster 33.6
>Modem. This customer is dialing into a Zoom 33.6 Modem hooked to a PM2e-30.
>The customer has not been able to connect at speeds higher than 9600bps.
>Any baud rate settings higher this within the Modem Properties causes the
>modems not to negotiate at all. With this in mind, I personally removed
>their USR and put in a Generic 33.6 modem which I use myself and know that
>works. This modem reacted the exact same way as the USR. Seeing this, I
>moved the computer to a different line. This new line runs through a PBX
>within the building while the bad line runs direct to the phone company
>switch building 1 block away. Both modems was then able to attach at speed
>above 24400bps. Telling the phone company GTE this, the service technician
>tested the bad line and said that the bad line was testing cleaner than the
>line that worked.
>
>Has anyone had a similar experience?
>How about one like this with GTE?
>Please comment.
>
>Thanx
>
>John Kozitzki
>Information Systems Manager
>B&W Co-op, Incorporated (http://www.bwcoop.com)
>RURAL-NET of Central Michigan (http://www.rural-net.com)
>B&W Farm Center / Case IH (http://www.bwcaseih.com)
>(517)842-3104 ext. 207
>johnk@rural-net.com
Here is a response from a friend who is not a subscriber to the Livingston
list.
>we had a similar situation with a bunch of folk in Nassau County, who no
matter what we tried, couldn't get above 9,600. This included lending out
one of our modems.
(The customer I was testing unfortunately left us, so we couldn't check
further).
My suspicion is that one of the telco trunk/compression thingees (now
there's a solid technical term...) was killing off the connection.
here's a file I put together of some related clips which seem to have
relevance.
***********
>From comp.dcom.telecom.tech Wed Apr 3 16:43:16 1996
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senet
From: X-Bones@worldnet.att.net (X-Bones)
Newsgroups: comp.dcom.telecom.tech
Subject: 9600 ONLY!! HELP!!!!!
Date: Wed, 03 Apr 1996 09:04:47 GMT
Organization: Delta Internet Services, Anaheim, CA
Lines: 31
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Ok whenever he connects to a BBS or internet provider it only connects
at 9600.. We have bought and returned different modems but all have
the same effect, 9600.. We took his computer (with modem inside) to my
house and plugged it into my phone line.. guess what.. It worked
fine..
Ok, my friend lives in Tustin/Orange area and I'm in Huntington
Beach.. My friend lives in a condo/apt type complex where there are
multiple units to one area.
Now I've heard that some places have somesort of Digitial converter or
something that will connect multiple phone lines (say his neighboors)
into one line. When the lines are merged they are also cut down to a
9600 max bandwith?? I read this in a magazine.
My friend called the phone company (Pac Bell) and they said they dont
do that (yeah right, what do the operators know about what goes on
underground) and they also said that Digital connections aren't
covered under their warranty service (no kidding, but a modem sends an
Analog signal).. Anyways, they couldn't help him (or didn't know
how)..
So some answers I'm looking for is..
1) why is it only connecting at 9600 (no matter what Modem I use over
9600)
2) how can he solve the problem.
Thank you so much for your help with this issue.... It very
appreciated.
>From comp.dcom.telecom.tech Fri Apr 5 02:36:30 1996
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eltanet.com!news.deltanet.com!jlundgre
From: jlundgre@delta1.deltanet.com (John Lundgren)
Newsgroups: comp.dcom.telecom.tech
Subject: Re: 9600 ONLY!! HELP!!!!!
Date: 4 Apr 1996 23:37:04 GMT
Organization: Delta Internet Services, Anaheim, CA
Lines: 55
Message-ID: <4k1mf0$5c9@news02.deltanet.com>
References: <31623f11.10819430@news.deltanet.com>
NNTP-Posting-Host: nfs3.delta.net
X-Newsreader: TIN [version 1.2 PL2]
X-Bones (X-Bones@worldnet.att.net) penned:
: Ok whenever he connects to a BBS or internet provider it only connects
: at 9600.. We have bought and returned different modems but all have
: the same effect, 9600.. We took his computer (with modem inside) to my
: house and plugged it into my phone line.. guess what.. It worked
: fine..
: Ok, my friend lives in Tustin/Orange area and I'm in Huntington
: Beach.. My friend lives in a condo/apt type complex where there are
: multiple units to one area.
: Now I've heard that some places have somesort of Digitial converter or
: something that will connect multiple phone lines (say his neighboors)
: into one line. When the lines are merged they are also cut down to a
: 9600 max bandwith?? I read this in a magazine..
: My friend called the phone company (Pac Bell) and they said they dont
: do that (yeah right, what do the operators know about what goes on
: underground) and they also said that Digital connections aren't
: covered under their warranty service (no kidding, but a modem sends an
: Analog signal).. Anyways, they couldn't help him (or didn't know
: how)...
: So some answers I'm looking for is..
: 1) why is it only connecting at 9600 (no matter what Modem I use over
: 9600)
: 2) how can he solve the problem.
: Thank you so much for your help with this issue.... It very
: appreciated.
Some parts of Huntington Bch and Westminster are GTE, that could be the
problem. I live in Orange, and I've never seen a DAML yet, tho I know
that they're out there from the talk of the telco installers and
repairmen. You might check with the telco to find out of there's one on
the line. They have records that tell how a subscriber line is built, so
they should know.
Other than that, maybe it's just a really crappy line that has a lot of
noise and losses. Or maybe it's the switch in the CO. One other thing,
check to see if there are any filters on the line. They could be causing
some of the problem.
BTW, I'm with Deltanet, so how come yours says AT&T?
-- #======P=G=P==k=e=y==a=v=a=i=l=a=b=l=e==u=p=o=n==r=e=q=u=e=s=t======# | John Lundgren - Elec Tech - Info Tech Svcs. | jlundgre@ | | Rancho Santiago Community College District | deltanet.com | | 17th St at Bristol \ Santa Ana, CA 92706 | http://rsc.rancho| | My opinions are my own, and not my employer's. | .cc.ca.us | | Most FAQs are available through Thomas Fine's WWW FAQ archive: | |http://www.cis.ohio-state.edu:80/hypertext/faq/usenet/FAQ-List.html| | "You can flame your brains out -- it won't take long." | #===T=u=z=l=a==C=o=m=p=a=n=y=.=.===t=h=r=e=e='=s==L=e==C=r=o=w=d=!==#>From comp.dcom.telecom.tech Sat Apr 6 04:32:42 1996 Path: panix!netaxs.com!news2.cais.net!news.cais.net!news1.erols.com!imci5!imci4!ne wsfeed.internetmci.com!uwm.edu!news.sol.net!solaria.sol.net!ksinner From: ksinner@solaria.sol.net (Kenton E. Sinner) Newsgroups: comp.dcom.telecom.tech Subject: Re: 9600 ONLY!! HELP!!!!! Date: 6 Apr 1996 00:33:20 GMT Organization: Solaria Public Access UNIX - Milwaukee, WI Lines: 12 Message-ID: <4k4e4g$lo@hummin.sol.net> References: <31623f11.10819430@news.deltanet.com> <4k1hi8$in4@woody.wcnet.org> NNTP-Posting-Host: solaria.sol.net X-Newsreader: TIN [version 1.2 PL1]
I have a similar problem. I used to be able to connect regularly at 16,800 bps, but a couple of weeks ago, the line quality changed, and now all I can get reliably is 9600 bps. If I connect at a higher rate, such as 14,400, my modem keeps losing its carrier, often resulting in disconnection, and always resulting in things like timeouts. This also happens at 9600, but not as often. What could the phone company have done two weeks ago to screw up my lines so much? Any suggestions, especially for things I can do about it short of paying through the nose for a special connection?
Thanks.
>From comp.dcom.telecom.tech Sat Apr 6 04:33:01 1996 Path: panix!imci5!pull-feed.internetmci.com!news.internetMCI.com!newsfeed.internet mci.com!in2.uu.net!news.deltanet.com!usenet From: X-Bones@worldnet.att.net (X-Bones) Newsgroups: comp.dcom.telecom.tech Subject: Re: 9600 ONLY!! HELP!!!!! Date: Sat, 06 Apr 1996 07:44:07 GMT Organization: Delta Internet Services, Anaheim, CA Lines: 34 Message-ID: <31662004.1630574@news.deltanet.com> References: <31623f11.10819430@news.deltanet.com> <4jv33g$f33@googol.bctel.net> <31649E58.1262@limestone.kosone.com> NNTP-Posting-Host: lkf0174.deltanet.com X-Newsreader: Forte Agent .99d/32.182
Ok just to let all of you know, I found out what the problem is... I read in a Magazine that many phone companies are starting to implement digital voice compression into many new (and updating old as well) communities. This converts analog to digital via compression routines and the troughput signal is a max of 9600 bandwith.. Bummer huh, the reason they do that is so they can fit more phone lines into one box (or whatever they plug them all into). Anyways this is not reversable and there is no way out considering the phone companies only guarantee voice communication and not computer..
well thank you all for the responses..
On Thu, 04 Apr 1996 23:15:20 -0500, Ed Gastle <egastle@limestone.kosone.com> wrote:
>Fred Jorgensen wrote: > >> >why is it only connecting at 9600 (no matter what Modem I use) >> >> In all likelyhood it is simply cable distance to the C.O. Check for cable >> length and gauge. 28.8 is only good for about a mile. 14.4 2 to 3 miles, >> and beyond that, good luck, especially with 26 gauge cable... > >That's funny, I live > 5 miles from my C.O. and I connect at 14.4 most of the >time. If not 14.4 then 12000. Never 9600. The length of cable by itself >doesn't cause as many problems as the various equipment that is on the line >to get your signal to the C.O. > >I didn't see the original post but I would suggest posting modem problems to >the comp.dcom.modems group. For accurate information regarding modem >configuration, and limitations, try Curt's modem FAQ @ >http://www.teleport.com/~curt/modems.html
>From comp.dcom.telecom.tech Sun Apr 7 21:02:13 1996 Path: panix!bloom-beacon.mit.edu!newsxfer2.itd.umich.edu!agate!howland.reston.ans. net!gatech!newsfeed.internetmci.com!in1.uu.net!winternet.com!inforamp.net!ts 18-05 From: crs0794@inforamp.net (Geoffrey Welsh) Newsgroups: comp.dcom.telecom.tech Subject: Re: 9600 ONLY!! HELP!!!!! Date: 8 Apr 1996 00:04:47 GMT Organization: InfoRamp Inc., Toronto, Ontario (416) 363-9100 Lines: 52 Message-ID: <4k9l6v$fnf@sam.inforamp.net> References: <31623f11.10819430@news.deltanet.com> NNTP-Posting-Host: ts18-05.tor.istar.ca X-Newsreader: News Xpress Version 1.0 Beta #4
In article <31623f11.10819430@news.deltanet.com>, X-Bones@worldnet.att.net (X-Bones) wrote: >Ok whenever he connects to a BBS or internet provider it only connects >at 9600.. We have bought and returned different modems but all have >the same effect, 9600.. We took his computer (with modem inside) to my >house and plugged it into my phone line.. guess what.. It worked >fine.. > >Ok, my friend lives in Tustin/Orange area and I'm in Huntington >Beach.. My friend lives in a condo/apt type complex where there are >multiple units to one area. > >Now I've heard that some places have somesort of Digitial converter or >something that will connect multiple phone lines (say his neighboors) >into one line. When the lines are merged they are also cut down to a >9600 max bandwith?? I read this in a magazine.. > >My friend called the phone company (Pac Bell) and they said they dont >do that (yeah right, what do the operators know about what goes on >underground) and they also said that Digital connections aren't >covered under their warranty service (no kidding, but a modem sends an >Analog signal).. Anyways, they couldn't help him (or didn't know >how).. > >So some answers I'm looking for is.. > >1) why is it only connecting at 9600 (no matter what Modem I use over >9600)
There are many possibilities. One is that the phone company may be using a lossy digital compression technique called ADPCM. Another possibility, especially if the phone company had to put in a second line somewhere but couldn't get an extra set of wires pulled through, is that they used some form of multiplexing to 'piggyback' a second line on an existing pair of wires. The effects are supposedly devastating on the more demanding POTS applications (modems, FAX, etc.)
>2) how can he solve the problem.
I'm not sure that there's anything he can do as long as it's a residential voice line. Get the line (and its rates!) upgraded to a business, FAX, or data line and demonstrate that it's not living up to its requirements, and you may move the phone company to try to do something... but the only guarantee is that the line will become far more expensive!
-- Geoffrey Welsh, Developer, InSystems Technologies Inc. Temporary: crs0794@inforamp.net; At work: insystem@pathcom.com At home: geoff@zswamp.uucp or [xenitec.on.ca|m2xenix.psg.com]!zswamp!geoff Capitalism is a cold-hearted system which guards the interests of whoever's at the top, yet hypocritically claims that it offers everyone a fair shot. So is every other system ever put in place by man.>From comp.dcom.telecom.tech Fri Nov 24 21:17:14 1995 Path: panix!bloom-beacon.mit.edu!uhog.mit.edu!uw-beaver!cornellcs!newsstand.cit.co rnell.edu!news.kei.com!newsfeed.internetmci.com!howland.reston.ans.net!ix.ne tcom.com!ix-sc7-13.ix.netcom.com!user From: Sgulie@ix.netcom.com (Steven Gulie) Newsgroups: comp.dcom.telecom.tech Subject: Re: More than 24 voice channels on T1..Possible??? Date: Mon, 20 Nov 1995 23:27:19 -0800 Organization: Ayslexics Disnonymous Lines: 34 Message-ID: <Sgulie-2011952327190001@ix-sc7-13.ix.netcom.com> References: <Pine.LNX.3.91.951119153240.75A-100000@ulic> NNTP-Posting-Host: ix-sc7-13.ix.netcom.com X-NETCOM-Date: Mon Nov 20 11:35:35 PM PST 1995 X-Newsreader: Yet Another NewsWatcher 2.0.2
In article <Pine.LNX.3.91.951119153240.75A-100000@ulic>, Beckman <beckman@vader.sithlords.com> wrote:
> A recent discussion has caused me to wonder if it is possible to have > more than 24 voice channels on a T1, by breaking out the bandwidth > differently.
For voice channels, the technology of choice is AD/PCM, sometimes erroneously refered to as "bit compressors". It multiplexes two voice channels onto a single DS0, at 32 Kbaud each. You cannot hear the difference between ordinary 64 Kbaud PCM and 32 Kbaud AD/PCM. It will generally block modems at speeds above 9600 baud data, however, as some of the more subtle phase and amplitude information is not preserved.
You need to have AD/PCM cards at both ends of the T1, *optioned the same way*. Granger used to be the biggest manufacturer of these things, and probably still is. BTW, it stands for Adaptive Differential Pulse Code Modulation, and instead of quantizing the absolute audio amplitude, it quantizes the difference from the last sample. So it's a little less able to go from zero to full scale quickly, but speech generally doesn't do that anyway.
All the cellular carriers used to use them, as the audio quality of AD/PCM generally exceeds cellular, and they could halve the cost of T1 to the cell sites. They have to tear all that out now, to make way for TDMA and CDMA, which compress voice more efficiently still, and cannot tolerate AD/PCM on their "voice" circuits, which are really data circuits carrying encoded voice.
*Say*, maybe you could get a *deal* on some AD/PCM cards from your local cellular carrier... just a thought.
Steve Gulie (sgulie@ix.netcom.com)