🚀 go-pugleaf

jecome01@vulcan.spd.louisville.edu (Eric Comer) writes:
>I was wondering if anyone knew the voltage that is sent on the ringer
>line of a telephone cable when a call is incoming.  any help would be
>greatly appreciated.
>
(extracted from a lengthier document)
...
You should conform to the following:

TYPE				MIN (Ohm)	NOM. (Ohm)	MAX. (Ohm)
====================   		=========	=========	=========
*******************************Impedance**********************************
--------------------------------RINGING-----------------------------------
AC (at 40Hz, T=R)		1,000
AC (680 Hz to 1660 Hz)		2,000
...
The Phone Company will provide you:

TYPE				MIN		NOM.		MAX.
====================   		=========	=========	=========
Voltage DC (T=R)		47 V		48 V		105 V
Ring AC voltage (T=R)		40 Vrms		90 Vrms		130 Vrms
Ring frequency			15.8 Hz		20 Hz		68 Hz
Ring ON/OFF time				1s/1s
DC current			20mA		30mA		120mA
Noise								15dBrnC
...
T=R means tip to ring