DC offset made by a telephone exchange on telephone line

DC offset made by a telephone exchange on telephone line

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Subject Author Date
DC offset made by a telephone exchange on telephone line Peter Addor 06-02-2006
Posted by Peter Addor on June 2, 2006, 7:54 am
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We have a PSTN telephone exchange (like Siemen's EWSD, Ascom's AXE or
Alcatel's S12) and observed that it shows some strange DC offsets if
the state of a connection is "waiting" or "undefined".

I wonder if this is compatible to the standards but don't know which
standard is concerned. There is something in G.711 but not a definitive
statement like "after dialing the switch has to send a DC offset of H00
for xy ms" or something like this.

Does anybody knows some standard concerned issues?

Thanks alot!

Regards,
Peter


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