[Gllug] OT: What is the REN of a modern powered phone?

Chris Bell chrisbell at chrisbell.org.uk
Sun Nov 7 10:26:06 UTC 2010


Hello,
   Old analogue phones with line-break dialling could sit across the
incoming line as long as only one was actually in use and there were not
more than six 1Kohm impedance ringers in series. The specification was
changed so that up to 4 higher impedance ringers could be connected in
parallel ("4 REN").
   Many modern phones do not require the "ringer" wire because they use tone
coding, so what is their actual REN? And how many can actually sit on the
line but with their handset on the rest without excessive line loading? I do
use my landline, and it is much more convenient to have phones available
where they are needed.

-- 
Chris Bell www.chrisbell.org.uk (was www.overview.demon.co.uk)
Microsoft sells you Windows ... Linux gives you the whole house.

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