Method of and a circuit arrangement for determining current criteria in the lines of a telephone system
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jun 17, 1986
Grant Date -
N/A
app pub date -
Sep 27, 1982
filing date -
Oct 17, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method of and a circuit for determining current criteria in a subscriber's loop of a telephone system are described. Two constant-current sources are symmetrically connected to two wires of the loop and are controlled by an adjustable reference voltage source. Voltage signals on the voltage source are evaluated in a detecting circuit to determine the actuation of a ground button on the subscriber's set or the occurrence of a ground short-circuit. A testing device is connectable to the subscriber's loop to simulate various conditions of the subscriber's set.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Advertisement
Advertisement
Advertisement
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully