Re: [help] DSL Stats. Normal?

Author	All Replies
usweefive join:2008-04-27 East Hampton, CT	reply to NormanS Re: [help] DSL Stats. Normal? There you go ! The attenuation was low due to a bad connection. There is a reason why you had partial success: the differential input of the DSL modem. Twisted pair systems use common-mode rejection similar to an Op Amp where common noise on a pair of wires is canceled out. The DSL modem's phone line input was operating single-input instead of dual and there was no common-mode rejection possible... ergo the very low noise figure incoming.
usweefive join:2008-04-27 East Hampton, CT	to forum · permalink · · 2008-05-01 09:26:51 ·
NormanS Premium,MVM join:2001-02-14 San Jose, CA ·Pacific Bell - SBC edit: May 1st, @02:31PM	said by usweefive : The attenuation was low due to a bad connection. I would expect an open to raise the attenuation, not lower it. An effective impedance of infinite ohms should provide perfect attenuation. It was my S/N ratio which was low. I believe the reason the DSL worked into an open circuit is that it operates at an RF freqency, so an extremely short gap, while looking "open" to DC current, still looks like a usable path to AC. -- Norman ~Oh Lord, why have you come ~To Konnyu, with the Lion and the Drum
	to forum · permalink · · 2008-05-01 14:30:21 ·


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