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Landline automated testing [telecom]

Monitoring the audio on my at&t (swbt) landline without going offhook, each day at approx. 1:15am I record an automated test:

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I don't have a dso to record exactly what's happening, but a VOM across the line shows a momentary voltage drop from the usual -48v similar to going off hook. In addition, another test occasionally is performed-- this one with three tones similar (or identical) with some combination of SIT tones.

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Any idea of the purpose or scope of these tests?? I believe the line is served by 5ESS.

Regards,

***** Moderator's Note *****

I've never heard those tones, or anything like them, before.

Bill Horne Moderator

Reply to
highflux7
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I sometimes leave a butt set across my 5ESS line and have heard that

3-tone test as well, also around 1am. I believe it's the ALIT, or Automatic Line Insulation Test.

If your line is off-hook when it was scheduled, I'm not sure if it's done later, or postponed to the next day.

***** Moderator's Note *****

A. Because it disturbe the normal top-to-bottom flow of a written conversation.

Q. Why is top-posting bad?

Bill Horne Moderator

Reply to
cc3e53d1-f895-4dfa-bc2a-c1ad68387b9e

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