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Old 8th Aug 2017, 9:01 pm   #4
AndiiT
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Join Date: Aug 2005
Location: Saltburn-East, Cleveland, UK.
Posts: 1,786
Default Re: REN, Resistors &c.

Hi,
REN has always been a bit of a grey area as far as I'm concerned and I agree that in most cases line length will be a contributing factor to how much, or how little, REN is available on any line.

I recall seeing a comment, in many telephone instruction manuals in the early/mid 1980's after the introduction of the "new" plug and socket system that went something along the lines of "mixing different types of calling devices on an exchange line may result in not all the (your) phones ringing"

I always understood the "different types of calling device" comment to mean tone callers and bells and figured that the reason all the phones may not ring, if an inductive bell and a capacitive tone caller were connected on the same lane, would be due to the ringing current being shorted out by a combination of the inductance and capacitance of the bell motor and tone caller being resonant at a particular frequency which looked like a short circuit to the ringing current.

Regards

Andrew
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