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From: johnk@opel.uu.net (John Kennedy)
Newsgroups: comp.dcom.telecom
Subject: Need Information on "Bit Slippage"
Message-ID: <telecom-v09i0509m03@vector.dallas.tx.us>
Date: 13 Nov 89 15:53:09 GMT
Sender: news@vector.Dallas.TX.US
Reply-To: johnk@opel.UUCP (John Kennedy)
Organization: Second Source, Inc., Annapolis, MD
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Approved: telecom-request@vector.dallas.tx.us
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X-TELECOM-Digest: volume 9, issue 509, message 3 of 13

A coworker is experiencing a problem while using a 1200-baud dialup
modem, where he is seeing periodic "}" symbols, and characters 0x255
and 0x251.

When I was having a similar problem at another company, the phone
gurus there told me this was a phenomenon known as "bit slippage",
whereby two switches were losing sync on the digital connection
between them.

Several questions:

1)  Does the problem I described seem like a fair diagnosis?

2)  Where is this "slippage" problem occur - between the subscriber
    and the switch, or between the two switches?

3)  Can this problem be addressed by doing something with the subscriber's
    interface to the local switch?

4)  What can the subscriber do about it?  Does he have the
    right to have the problem corrected?  Would ordering a so-called
    "conditioned line" either correct the problem or give the subscriber
    a right to have the problem corrected?

5)  Are the local telco's sympathetic to residential customers' data
    problems?

6)  Is there someone to ask for in a local office, if the usual
    customer assistance people are unable to help?

Thanks,


John Kennedy                     johnk@opel.uu.uunet
Second Source, Inc.
Annapolis, MD