: Modems support V.90 standard.
The Springfield modem pool has been upgraded to support the V.90 standard. This
standard replaces the old 56K-flex and X2 proprietary protocols.
Users should be able to connect at higher rates with K-flex, X2, or V.90 modems
provided their phone lines are of sufficient quality.
October 6th, 1998
Networking Administration has finished upgrading all of the 231 modems making up the
Springfield modem pool. Users with 56k-flex, X2, or v.90 modems should be able to
connect to Missouri State University at data rates up to 56K depending upon the quality of their phone line.
Users who have a supported modem, but do not see higher rates could have one of the
following problems:
 | Insufficient quality wiring in the home. Take a laptop to the demarcation jack
outside your house and see if you consistently get a better connect rate.
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| Insufficient line quality from your house to the telephone central office. You can
contact your carrier to have the line quality examined. Southwestern Bell will test
the line for free. While some enhancements can sometimes be made for free, charges
to make improvements, if possible, are handled on a case by case basis. Contact SWBT
Repair at 800-734-7590 or your local carrier for more information.
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| Your telephone carrier may be using SLIC boxes (a telephone multiplexor) to service your
area. These devices deliver up to 96 telephone lines over a circuit designed to
handle only 24 connections. SWBT claims they do not currently use SLICs for
residential customers.
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| The route you take to Missouri State University's modems could be of insufficient quality.
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| The route your call takes to the Missouri State University modem pool could be experiencing more than one
analog to digital conversion. Missouri State University Springfield uses digital trunks of a very high
quality to support the modem pool. However, most homes still have analog modems.
Your telephone carrier's equipment will convert the signal from analog to digital
before it is transmitted to the Missouri State University incoming trunks. If it happens that the route
your modem call traverses causes it to be converted to digital and back to analog even
once, the signal quality is degraded too much for higher speed calls to function. |
The telephone network was developed with the intent to deliver a high-quality of voice
service to business and residential customers, not to deliver computer data services.
While the phone companies endorse the use of the voice lines for data, a voice line
cannot be guaranteed to deliver a high-speed data service to all locations at all times.
If you are connecting at data rates higher than 28,800 baud consistently and
especially at rates over 33,600 baud, then you should consider yourself fortunate.
For consistent, higher-speed data rates, contact your local phone company regarding
digital ISDN service.
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