US3843844A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Subscriber loop circuit apparatus
Assignee: International Standard Electric Corp
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Filing: 1972-02-11
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Granted: 1974-10-22
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Expires: 1992-02-11
Abstract
Abstract Circuit apparatus is provided for extending the allowable distance between the subscriber''s loop and the central office. To provide this feature, the circuits sense a subscriber loop line closure to add an increased voltage for the conversation path and improved supervisory signalling. With the increased voltage, the current to the subscriber''s conversation path is maintained at a constant level. Further additional circuits such as a bidirectional voice frequency repeater, pulse correction circuits, and supervisory control circuits operative at the increased voltage may be connected into the conversation path. With reverse battery signalling, the polarity is sensed to activate the current regulation. On a call to the subscriber loop, the ringing signals are bypassed until the call is answered.
Inventors
- 👤 A Schumperli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:02
CPC Classifications
H; H04; H04M; H04M19/00; H04M19/001; H04M19/006; H04Q; H04Q3/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
146 words
Circuit apparatus for improving both signalling and voice transmission characteristics on a two-lead line between a subscribers loop and a central office comprising a current regulating network associated with each lead of said line, means responsive to closure of said line loop for connecting each regulating network to the associated line lead, means for sensing the voltage at the output of one current regulating network from its connected line lead, means responsive to a low voltage condition sensed by said one regulating network for connecting a voice frequency repeater to said line leads, and wherein there is a normally open ringing path in parallel with a portion of said line leads, and means for closing said ringing path responsive to ringing directed toward said subscriber loop to bypass said repeater, said sensing means and said regulating networks from said line loop during the continuation of ringing.
Claim 2
Dependent Claim
146 words
Circuit apparatus for improving both signalling and voice transmission characteristics on a two-lead line between a subscribers loop and a central office comprising a current regulating network associated with each lead of said line, means responsive to closure of said line loop for connecting each regulating network to the associated line lead, means for sensing the voltage at the output of one current regulating network from its connected line lead, means responsive to a low voltage condition sensed by said one regulating network for connecting a voice frequency repeater to said line leads, and wherein there is a normally open ringing path in parallel with a portion of said line leads, and means for closing said ringing path responsive to ringing directed toward said subscriber loop to bypass said repeater, said sensing means and said regulating networks from said line loop during the continuation of ringing.
Claim 3
Dependent Claim
37 words
Circuit apparatus as claimed in claim 1, wherein there are switching means responsive to closure of said line loop for closing said portion of said line leads to said line loop and for isolating said ring path.
Claim 4
Dependent Claim
159 words
Circuit apparatus for enhancing voice transmission and supervisory signalling from between an office and a subscriber''s loop comprising, means responsive to the initiation of ringing on a call from said office to said loop for closing said direct ringing path to said subscriber''s loop, means responsive to an offhook condition at said loop for terminating said ringing signals to said loop, and further means operative in response to the termination of said ringing signals for disconnecting said direct ringing path, said last mentioned means on operation closing an alternate path to said loop, means in said alternate path for providing booster battery to the loop-to-office connection and for regulating the current in said connection to predetermined levels suitable for transistor voice transmission across said connection, and further including means responsive to a polarity reversal in said loop resulting from said off hook condition for reversing the direction of current flow from said booster battery meaNs to said loop-to-office connection.
Claim 5
Dependent Claim
159 words
Circuit apparatus for enhancing voice transmission and supervisory signalling from between an office and a subscriber''s loop comprising, means responsive to the initiation of ringing on a call from said office to said loop for closing said direct ringing path to said subscriber''s loop, means responsive to an offhook condition at said loop for terminating said ringing signals to said loop, and further means operative in response to the termination of said ringing signals for disconnecting said direct ringing path, said last mentioned means on operation closing an alternate path to said loop, means in said alternate path for providing booster battery to the loop-to-office connection and for regulating the current in said connection to predetermined levels suitable for transistor voice transmission across said connection, and further including means responsive to a polarity reversal in said loop resulting from said off hook condition for reversing the direction of current flow from said booster battery meaNs to said loop-to-office connection.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |