[mod.telecom] Periodic noise on 1200 baud lines

AI.CLIVE@MCC.ARPA (Clive Dawson) (11/29/85)

Dialup users of the various systems in our company have complained about
noisy telephone lines for quite a while, and it's generally accepted that
the quality of the trunks in this area is poor.   Recently, however,
we've had complaints from one particular user who says that he gets a
burst of noise consisting of a DEL followed by a {, PRECISELY every 30
seconds.  Does anybody know possible causes for this?  I remember an
item in Telecom sometime back about periodic glitches on synchronous
high speed lines, but I suspect this is unrelated.  Does the CO poll
phone lines to check for things like "off-hook" conditions, etc., which
might account for this?  

Thanks,

Clive

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