Patent US4360809A successfully refreshed from Google Patents.
US4360809A
Expired / Lapsed
US
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Matrix switch and method of controlling cross point switch of a matrix switch
Assignee: US Philips Corp
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Filing: 1981-01-19
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Granted: 1982-11-23
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Expires: 2001-01-19
Abstract
Abstract The matrix switch comprises a plurality of input lines (Y 1 -Y 4 ), a plurality of output lines (Y 1 -Y 4 ) and a plurality of crosspoint switches for selectively connecting one or more input lines to one or more output lines. When such a matrix switch is used for telephony systems the input lines are connected to the subscriber's lines and the output lines to the outgoing lines. Each of the input lines is coupled to input lines of an additional matrix switch via an impedance (which is equal to the characteristic impedance of the subscriber's line). The additional matrix switch has a first output line, which is connected via cross-point switches to the input lines of the additional matrix switch for terminating the selected input lines of the matrix switch with the impedance. A second output lines connects a tone generator to the input lines via the crosspoint switches. A further embodiment shows a matrix switch arranged for use with balanced lines.
Inventors
- 👤 Wouter Bourgonje
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:50
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/42; H04Q3/52; H04Q3/521
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
125 words
A switching matrix comprising: a first switching matrix having a plurality of input lines, a plurality of output lines and a plurality of crosspoint switches for selectively connecting one or more input lines to one or more output lines, a second switching matrix having a plurality of input lines, at least one output line and a plurality of crosspoint switches, each input line of said second switching matrix being connected to the input lines of said first switching matrix by means of an impedance, the output line of said second switching matrix being coupled to a point of substantially constant potential for terminating with the said impedance the input lines of said first switching matrix selected by said crosspoint switches of said second switching matrix.
Claim 2
Dependent Claim
125 words
A switching matrix comprising: a first switching matrix having a plurality of input lines, a plurality of output lines and a plurality of crosspoint switches for selectively connecting one or more input lines to one or more output lines, a second switching matrix having a plurality of input lines, at least one output line and a plurality of crosspoint switches, each input line of said second switching matrix being connected to the input lines of said first switching matrix by means of an impedance, the output line of said second switching matrix being coupled to a point of substantially constant potential for terminating with the said impedance the input lines of said first switching matrix selected by said crosspoint switches of said second switching matrix.
Claim 3
Dependent Claim
59 words
A switching matrix as claimed in claim 1 wherein said second switch matrix comprises a tone generator which is connected between an output line of said second switching matrix and the said point of substantially constant potential for applying tone frequency signals to said first switching matrix input lines selected by said crosspoint switches of said second switching matrix.
Claim 4
Dependent Claim
39 words
A switching matrix as claimed in claim 1 wherein said input and output lines of said first switching matrix and said second switching matrix are combined in pairs to form lines which can be excited in the balanced mode.
Claim 5
Dependent Claim
167 words
A switching matrix comprising a plurality of controlling crosspoint switches in a first switching matrix said first switching matrix further comprising a plurality of input lines and a plurality of output lines, said crosspoint switches being located at the intersections of the said lines and interconnecting in a first position an input line to an output line and breaking this connection in a second position, a second switching matrix having a plurality of input lines, at least one output line and a plurality of crosspoint switches, each input line of said second switching matrix being coupled to the input lines of said first switching matrix by means of an impedance, the output line of said second switching matrix being coupled to a point of substantially constant potential, selected crosspoint switches of said second switching matrix being adjusted to the first position for terminating with said impedance the input lines of said first switching matrix which were determined by the selected crosspoint switches of said second switching matrix.
Claim 6
Dependent Claim
167 words
A switching matrix comprising a plurality of controlling crosspoint switches in a first switching matrix said first switching matrix further comprising a plurality of input lines and a plurality of output lines, said crosspoint switches being located at the intersections of the said lines and interconnecting in a first position an input line to an output line and breaking this connection in a second position, a second switching matrix having a plurality of input lines, at least one output line and a plurality of crosspoint switches, each input line of said second switching matrix being coupled to the input lines of said first switching matrix by means of an impedance, the output line of said second switching matrix being coupled to a point of substantially constant potential, selected crosspoint switches of said second switching matrix being adjusted to the first position for terminating with said impedance the input lines of said first switching matrix which were determined by the selected crosspoint switches of said second switching matrix.
Claim 7
Dependent Claim
60 words
The switching matrix as claimed in claim 4 wherein said second switching matrix comprises a tone generator which is connected to an output line of said second switching matrix, selected crosspoint switches of the said output line of said second switching matrix being adjusted to the first position during a predetermined period of time and with a predetermined repetition frequency.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-11-22 | 1986-05-24 | 1986-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-22 | 1990-05-24 | 1990-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-22 | 1994-05-24 | 1994-11-23 | $7700.00 | Window Closed / Lapsed |