Ringing generator testing arrangement for a digital telephone ne

Details Ringing generator testing arrangement for a digital telephone ne Ringing generator testing arrangement for a digital telephone ne

1983-06-22

1985-01-29

Schreyer, Stafford D.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

179 84VF, 324 78D, H04M 322

Patent

active

044968000

ABSTRACT:
A ringing generator testing arrangement for a digital telephone network is shown comprising a zero crossing detector connected to the ring lead of a line circuit under test. The zero crossing detector gates a clock signal into a counter circuit during the negative to positive transition of the ringing generator signal positive half cycle. The counter circuit advances until the next positive to negative transition of the ringing generator signal. At this time, the zero crossing detector cuts off the clock signal and the counter circuit transmits to a central control complex a count representing a measured interval of the ringing generator positive half cycle.

REFERENCES:
patent: 3971897 (1976-07-01), Ohl et al.

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