55 lines
3.2 KiB
Plaintext
55 lines
3.2 KiB
Plaintext
=====[ YOUR SYSTEM HAS NOISE ]==============================================
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Written by Bill Noel
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Your system has noise!! Ever heard that from one of your users? Of
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course you have. And did you have a problem? Most likely not. If you
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had a noisy line then all of your calls would have been noisy. Then
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where is the problem? It is in what is known as the trunking network.
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The Trunking Network is a series of lines and trunks that connect
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switching offices. All offices do not have direct trunks, so they are
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routed through a connection office. Sometimes these trunks operate on
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copper cable, sometimes onT-Carrier, and sometimes on the Fiber Optic
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cables that are currently being installed. Any one of these methods can
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cause data problems. In fact, any carrier system can cause one way data
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errors. That is, the BBS can be seeing errors and the user does not see
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them, or vice versa. The latter problem makes your user know for sure
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that your BBS is in trouble.
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Trunking Network problems are the most difficult problems to solve.
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Southern Bell does not train their Repair Clerks to handle trunking
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complaints. What you should do when you experience data problems to a
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certain exchange is listen to a quiet line into that office. Try to
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describe the problem in terms of steady noise, "popping," "frying,"
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"other people on the line", etc. Tell the repair clerk that you always
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have this type of problem when calling the 457 exchange when calling
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from the 999 exchange. Tell her this is a trunking problem and to
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please really the report to Trunking Maintenance. Never tell her that
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you have a data problem. Southern Bell does not guarantee data
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transmission on non-conditioned lines. (However, a non-conditioned line
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that meets all of their normal residential service requirements will
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support data up to 2400 baud with very little problems). Remember that
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when you buy a cheap modem, you get a cheap modem. Why was it cheap?
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Because they left things out like noise filters! Keep that in mind when
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you buy.
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But what if you are really having trouble on you line? Be careful
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before calling Ma Bell with a complaint. If you are not paying them the
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$1.00 service charge for House Wire Maintenance, they will hit you with
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about $35.00 per hour to fix the problem, or even if they don't fix it
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but prove it was you fault. The mini-jacks located in your house can
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cause you a lot of noise problems. They get all kind of things in them
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like smoke, grease, animal hair, and dust. These things cause the
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contacts to corrode. Corrosion causes noise. If you have an OHM meter
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and the technical skill to use it, lift the house wire from the
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terminals and check for high resistance shorts in you house with all of
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your modems and phones removed from the jacks.
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Noise problems can also come from the carbon blocks located in the small
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grey box located where the phone lines enter your house. Normally this
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condition will appear after an electrical storm or high winds when there
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may have been currents flowing on the phone lines. These devices belong
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to the phone company and you should not mess with them.
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I hope this will shed some light on the subject of noise for you.
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