US5889837A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Testing a subscriber terminal of a wireless telecommunications system
Assignee: Airspan Networks Inc
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Filing: 1996-05-31
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Granted: 1999-03-30
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Expires: 2016-05-31
Abstract
Abstract A subscriber station provides the wireless connection of user telecommunications equipment to a remote central station of a wireless telecommunications system. The subscriber station includes a transmitter/receiver for wireless communication with a central station and for processing signals for transmission and/or received signals, at least one telephone line for connection to subscriber telecommunications equipment, and a high impedance test circuit connected across a telephone line under test. The use of a high impedance test circuit means that the test circuit can effectively be connected permanently across a telephone line under test. By effectively connecting the high impedance test circuit permanently across the telephone line under test, that is connecting the test circuit across the telephone line during all operational conditions of the telephone line, the test circuit is able to provide a range of test functions, including self-test functions in a cost effective manner, which would not be possible with the conventional test circuits which are only switched in during line testing.
Inventors
- 👤 Joseph Sands
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:24
CPC Classifications
H; H04; H04W; H04W24/00; H04B; H04B17/00; H04B17/10; H04B17/15; H04B17/19; H04M; H04M3/00; H04M3/22; H04M3/26; H04M3/28; H04M3/30; H04W84/00; H04W84/02; H04W84/10; H04W84/14
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
94 words
A subscriber station for the wireless connection of user telephone set to a remote central station of a wireless telecommunications system, said subscriber station comprising: a transmitter/receiver for wireless communication with the remote central station; a communications controller coupled to the transmitted receiver for processing signals for transmission and/or received signals; subscriber telephone set coupled to the communications controller by at least one telephone line; and a high impedance test circuit connected across said telephone line, said high impedance test circuit operable to provide testing of said subscriber telephone set and said telephone line.
Claim 2
Dependent Claim
94 words
A subscriber station for the wireless connection of user telephone set to a remote central station of a wireless telecommunications system, said subscriber station comprising: a transmitter/receiver for wireless communication with the remote central station; a communications controller coupled to the transmitted receiver for processing signals for transmission and/or received signals; subscriber telephone set coupled to the communications controller by at least one telephone line; and a high impedance test circuit connected across said telephone line, said high impedance test circuit operable to provide testing of said subscriber telephone set and said telephone line.
Claim 3
Dependent Claim
28 words
A subscriber station according to claim 1, comprising two or more telephone lines and a relay for selectively connecting said test circuit across one of said telephone lines.
Claim 4
Dependent Claim
26 words
A subscriber station according to claim 1, wherein said test circuit is continually connected across said telephone line during normal operation of said subscriber telephone set.
Claim 5
Dependent Claim
24 words
A subscriber station according to claim 1, wherein said test circuit is connected to each wire of said telephone line via a resistive connection.
Claim 6
Dependent Claim
16 words
A subscriber station according to claim 4, wherein said resistive connection comprises a plurality of resistors.
Claim 7
Dependent Claim
33 words
A subscriber station according to claim 4, wherein said resistive connection has a resistance in excess of 100 KOhm, preferably in excess of 500 KOhm and more preferably in excess of 1 MOhm.
Claim 8
Dependent Claim
41 words
A subscriber station according to claim 1, wherein said test circuit comprises an operational amplifier connectable across said telephone line for buffering the potential across said telephone line and a voltage monitor circuit connected to the output of said operational amplifier.
Claim 9
Dependent Claim
18 words
A subscriber station according to claim 7, wherein said voltage monitor circuit comprises a peak voltage monitor circuit.
Claim 10
Dependent Claim
33 words
A subscriber station according to claim 8, wherein said peak voltage detector is arranged to monitor a ringing amplitude for an incoming call and to compare the actual voltage against a minimum threshold.
Claim 11
Dependent Claim
27 words
A subscriber station according to claim 1, wherein said test circuit comprises a positive peak voltage detector and a negative peak voltage detector for detecting hazardous voltages.
Claim 12
Dependent Claim
20 words
A subscriber station according to claim 1, wherein said test circuit includes a circuit for detecting an externally applied voltage.
Claim 13
Dependent Claim
37 words
A subscriber station according to claim 1, wherein said test circuit includes a circuit for detecting a voltage below a predetermined threshold in an off-hook condition of the telephone set as indicative of a short circuit condition.
Claim 14
Dependent Claim
49 words
A subscriber station according to claim 1, wherein said test circuit includes a circuit for applying a voltage, via a resistor, separately to each wire of said telephone line under test, thus providing a potential divider to earth, and a voltage monitor circuit to measure the resulting line voltage.
Claim 15
Dependent Claim
40 words
A subscriber station according to claim 1, further comprising a bell capacitor, wherein said test circuit includes a circuit for determining the state of the user equipment on a said telephone line by monitoring the discharge of said bell capacitor.
Claim 16
Dependent Claim
36 words
A subscriber station according to claim 1, wherein said test circuit includes a circuit for monitoring cable voltage during idle and is responsive to a voltage below the off-hook voltage to indicate an off-hook detector fault.
Claim 17
Dependent Claim
39 words
A subscriber station according to claim 1, wherein said test circuit includes a looping circuit for making a dummy call and a dial tone detector indicating of a dial tone returned from central station as indicative of correct operation.
Claim 18
Dependent Claim
26 words
A subscriber station according to claim 1, wherein said test circuit includes a ring trip test circuit for testing the operation of a ring trip detector.
Claim 19
Independent Claim
99 words
A method of testing functions of a subscriber station for the wireless connection of user telephone set to a remote central station of a wireless telecommunications system, said subscriber station comprising a transmitter/receiver for wireless communication with a central station, a communications controller for processing signals for transmission and/or received signals and at least one telephone line for connection to subscriber telephone set, said method comprising the step of providing a high impedance test circuit connected across a said telephone line said high impedance test circuit operable to provide testing of said subscriber telephone set and said telephone line.
Claim 20
Independent Claim
99 words
A method of testing functions of a subscriber station for the wireless connection of user telephone set to a remote central station of a wireless telecommunications system, said subscriber station comprising a transmitter/receiver for wireless communication with a central station, a communications controller for processing signals for transmission and/or received signals and at least one telephone line for connection to subscriber telephone set, said method comprising the step of providing a high impedance test circuit connected across a said telephone line said high impedance test circuit operable to provide testing of said subscriber telephone set and said telephone line.
Claim 21
Dependent Claim
35 words
A method according to claim 18, wherein said subscriber station comprises two or more telephone lines, said method comprising selectively switching said test circuit across one of said telephone lines under test using a relay.
Claim 22
Dependent Claim
29 words
A method according to claim 18, comprising the step of maintaining said test circuit in continuous contact across said telephone line during normal operation of said subscriber telephone set.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-03-29 | 2002-09-28 | 2003-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-03-29 | 2006-09-28 | 2007-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-03-29 | 2010-09-28 | 2011-03-30 | $7700.00 | Window Closed / Lapsed |