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Tests to check noisy phone line
NOTICE: TO ALL CONCERNED Certain text files and messages contained on this site deal with activities and devices which would be in violation of various Federal, State, and local laws if actually carried out or constructed. The webmasters of this site do not advocate the breaking of any law. Our text files and message bases are for informational purposes only. We recommend that you contact your local law enforcement officials before undertaking any project based upon any information obtained from this or any other web site. We do not guarantee that any of the information contained on this system is correct, workable, or factual. We are not responsible for, nor do we assume any liability for, damages resulting from the use of any information on this site.
NOISY CONNECTIONS?
(Minimum Line Testing Requirements as set by the FCC.)
...by Lloyd Kautz
From "The CPC Newsletter" A monthly publication of the Connecticut
IMB Personal Computer Users Group.
*
Your local telephone company is required by the FCC to provide a
minimum level of quality on the lines it maintains for your use.
Many lines do not meet these standards, and so are a source of
considerable noise in transfer of data between computers. A noisy line can
make it very difficult to upload messages and files to a BBS.
If a SYSOP complains to the telephone company about line noise, there is
usually only one option offered: line conditioning. This is an extra cost item
that they would like to sell you. However, if their line to your computer
meets the minimum standards, there is no reason you cannot have error-free
transfers at 2400 bps and, if an error-correcting protocol is used, reliable
operation at 9600 bps is the norm.
If the telephone company seems reluctant to test your line and assure
that it meets the minimum requirements (and they will), request that they run
the following tests and provide you with the results. Let them understand
that if they do not comply, you will refer the matter to the FCC. They will
not be happy.
The following tests should be run:
1. Frequency sweep; 300 to 3000 hertz.
2. Roll off 5 to 2500 hz with -2 to +8 range. 300 to 3000 hz: -3 to +12
range. 1000 hz tone loss -16, 1% either direction.
3. Signal to noise: 24db.
4. White noise C, message Dbrnco.
5. Envelope delay measurement.
6. Phase jitter, not to exceed 10%.
7. Impulse noise test. Min. 15 minute test.
Don't worry if you do not understand what all these tests mean, the
telephone company knows. There standards are all available from the FCC upon
request. When the lines provided to you meet these minimums, you will
experience reliable, accurate, and noise free data.
==============================================================================
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