PSTN Echo
bsdaiwa:
Thanks Lavarock7, I had seen that post and it was helpful. I am in Brazil now and have been able to reduce the echo but still haven't been able to completely eliminate it by playing around with the ACImpedance settings. My dilemma is what is the setting entitled Global, all the other settings show the impedance but this one is not explained and shows nothing but the title "Global". It seems to solve the problem but I would like to know what it represents because one of the other settings may be closer to eliminating the problem.
drgeoff:
Those AC impedances listed in the Cisco document or elsewhere are merely nominal system design figures. No actual phone line will precisely have the impedance that the relevant telco network is designed around. The telco does NOT tweak each POTS line to make it come within some tolerance of the design figure. If you want the best impedance match to a particular POTS line, you have no real alternative but to try most of the available settings.
bsdaiwa:
Thaks to all for there input and guidance but I am still left with the unanswered question of "what is the setting entitled Global, all the other settings show the impedance but this one is not explained and shows nothing but the title "Global".
When you use the down arrow in the Value settings for ACImpedance you are given a list of settings starting with 600 then 900 and so on until you see at the bottom of the list the setting entitled Global. What I would like to know is what is that setting is that all of the above or 600+900+200.........what does it mean?
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