US3925601A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digital register sender and line circuit for data switch
Assignee: AT&T Inc
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Filing: 1975-01-20
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Granted: 1975-12-09
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Expires: 1995-01-20
Abstract
Abstract A switching office for line switching digital data messages includes a digital register sender for accepting inband digital address signals that control the switch and for sending inband digital data dial tone and call progress codes to the subscriber and digital line and trunk circuits for interchanging data between the line and trunk and intraoffice channels. The register sender also sends digital data signals to the line and trunk circuits to control the interchange of data and sends a ''''not ready'''' call progress code sequence to the calling subscriber when the called subscriber, although on-hook, is not ready to answer a call.
Inventors
- 👤 Robert Edward Cardwell
- 👤 David Emory Carlson
- 👤 Robert Leon Davis
- 👤 Edward Joseph Mcnamara
- 👤 Randolph John Pilc
- 👤 Gabriel Gary Schlanger
- 👤 David Morris Tutelman
- 👤 Peter Stephen Warwick
- 👤 Herbert Mortimer Zydney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:01
CPC Classifications
H; H04; H04L; H04L12/00
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
100 words
A line switching office for interconnecting data transmission channels including a plurality of intraoffice channels, an interface circuit including means for applying data signals received from each of the transmission channels to an associated one of the intraoffice channels, and switch means for interconnecting intraoffice channels; CHARACTERIZED BY a common control circuit connectable to the intraoffice channels and including means for sending control data signals to the interface circuits by way of the intraoffice channels; and means in each interface circuit responsive to the control data signals for precluding the application of received data signals to the associated intraoffice channel.
Claim 2
Dependent Claim
100 words
A line switching office for interconnecting data transmission channels including a plurality of intraoffice channels, an interface circuit including means for applying data signals received from each of the transmission channels to an associated one of the intraoffice channels, and switch means for interconnecting intraoffice channels; CHARACTERIZED BY a common control circuit connectable to the intraoffice channels and including means for sending control data signals to the interface circuits by way of the intraoffice channels; and means in each interface circuit responsive to the control data signals for precluding the application of received data signals to the associated intraoffice channel.
Claim 3
Dependent Claim
31 words
A line switching office, in accordance with claim 1, wherein the precluding means includes means for applying predetermined code signals to the intraoffice channel in place of the received data signals.
Claim 4
Dependent Claim
32 words
A line switching office, in accordance with claim 1, wherein the precluding means includes means responsive to a plurality of successive ones of the control data signals for operating the precluding means.
Claim 5
Dependent Claim
111 words
A line switching office, in accordance with claim 1, wherein the common control circuit further includes means responsive to address data signals received from an originating one of the transmission channels for controlling the switch means to interconnect a first intraoffice channel associated with the originating transmission channel with a second intraoffice channel associated with a terminating transmission channel defined by the address data signals, the controlling means further including means for enabling the control data signals sending means at the termination of the reception of the address data signals whereby the application of received data signals to the first intraoffice channel is precluded during the controlling of the switch means.
Claim 6
Dependent Claim
57 words
A line switching office, in accordance with claim 4, wherein the common control circuit includes means operative after the controlling of the switch means for sending unblind data signals to the interface circuit by way of the first intraoffice channel and the interface circuit includes means responsive to the unblind data signals for disabling the precluding means.
Claim 7
Dependent Claim
48 words
A line switching office, in accordance with claim 1, wherein the applying means includes means for storing the received data signals and means for passing the output of the storing means to the associated intraoffice channel and the precluding means for blocking the output of the storing means.
Claim 8
Dependent Claim
29 words
A line switching office, in accordance with claim 6, wherein the interface circuit includes means for overwriting the received data signals in the storing means with predetermined code signals.
Claim 9
Dependent Claim
102 words
A line switching office for interconnecting data transmission channels including a plurality of intraoffice channels, an interface circuit including means for applying data signals received from each of the transmission channels to an associated one of the intraoffice channels and switch means for interconnecting intraoffice channels; CHARACTERIZED BY a common control circuit responsive to the application of data signals to the intraoffice channels for operating the switch means and for sending code data signals to the interface circuits; and means in the interface circuit responsive to the code data signals for controlling the application of received data signals to the intraoffice channel.
Claim 10
Dependent Claim
102 words
A line switching office for interconnecting data transmission channels including a plurality of intraoffice channels, an interface circuit including means for applying data signals received from each of the transmission channels to an associated one of the intraoffice channels and switch means for interconnecting intraoffice channels; CHARACTERIZED BY a common control circuit responsive to the application of data signals to the intraoffice channels for operating the switch means and for sending code data signals to the interface circuits; and means in the interface circuit responsive to the code data signals for controlling the application of received data signals to the intraoffice channel.
Claim 11
Dependent Claim
32 words
A line switching office, in accordance with claim 8, wherein the controlling means includes means responsive to a plurality of successive ones of the code data signals for operating the controlling means.
Claim 12
Dependent Claim
49 words
A line switching office, in accordance with claim 8, wherein the common control circuit includes means for sending unblind data signals to the interface circuit after the operatIon of the switch means and the interface circuit includes means responsive to the unblind data signals for disabling the blocking means.
Claim 13
Dependent Claim
20 words
A line switching office, in accordance with claim 8, wherein the controlling means includes means for blocking the applying means.
Claim 14
Dependent Claim
95 words
A line switching office for interconnecting two-way data transmission channels including: a plurality of two-way intraoffice channels, an interface circuit including means for interchanging data signals in two directions between each of the transmission channels and an associated one of the intraoffice channels, and switch means for interconnecting pairs of intraoffice channels; CHARACTERIZED BY a common control circuit including means for sending data control signals to the interface circuits by way of the intraoffice channels; and means in each interface circuit responsive to the data control signals for controlling the interchanging of the data signals.
Claim 15
Dependent Claim
95 words
A line switching office for interconnecting two-way data transmission channels including: a plurality of two-way intraoffice channels, an interface circuit including means for interchanging data signals in two directions between each of the transmission channels and an associated one of the intraoffice channels, and switch means for interconnecting pairs of intraoffice channels; CHARACTERIZED BY a common control circuit including means for sending data control signals to the interface circuits by way of the intraoffice channels; and means in each interface circuit responsive to the data control signals for controlling the interchanging of the data signals.
Claim 16
Dependent Claim
37 words
A line switching office, in accordance with claim 12, wherein the interchanging means includes means for storing incoming data signals from the transmission channel and means for applying the stored data signals to the associated intraoffice channel.
Claim 17
Dependent Claim
20 words
A line switching office, in accordance with claim 13, wherein the controlling means includes means for disabling the applying means.
Claim 18
Dependent Claim
20 words
A line switching office, in accordance with claim 13, wherein the controlling means includes means for enabling the applying means.
Claim 19
Dependent Claim
29 words
A line switching office, in accordance with claim 13, wherein the controlling means includes means for overwriting the stored data signals in the storing means with predetermined code signals.
Claim 20
Dependent Claim
56 words
A line switching office, in accordance with claim 12, wherein the interchanging means includes means for storing outgoing data signals from the intraoffice channel and means for applying the stored data signals to the transmission channel and the controlling means includes means for overwriting the stored data signals in the storing means with predetermined code signals.
Claim 21
Dependent Claim
104 words
A line switching office, in accordance with claim 12, wherein each of the interface circuits includes means for normally applying data signals to the associated intraoffice channel defining signal conditions on the transmission channel, and the common control circuit includes means effective upon the switch means interconnection and responsive to the normally applied data signals on one of the intraoffice channels in the interconnection for generating a call progress data code sequence representing the signal condition defined by the normally applied data signals and transmitting the call progress data code sequence to the other interface circuit by way of the intraoffice channel associated therewith.
Claim 22
Dependent Claim
56 words
A line switching office, in accordance with claim 18, wherein the controlling means includes means responsive to an initial data control signal in the call progress data code sequence for enabling passage of data signals on the intraoffice channel to the transmission channel whereby the call progress data code sequence is passed to the transmission channel.
Claim 23
Dependent Claim
155 words
In a line switching office for interconnecting two-way data transmission channels, a plurality of two-way intraoffice channels, an interface circuit for connecting each of the transmission channels to an associated one of the intraoffice channels, and switch means for interconnecting the intraoffice channel associated with a calling transmission channel to the intraoffice channel associated with an available called transmission channel; CHARACTERIZED BY means in each of the interface circuits responsive to a first and second signal conditions on the transmission channel for applying data signals defining the signal condition on the transmission channel to the associated intraoffice channel, and common control means responsive to the application of data signals to the intraoffice channel interconnection for generating one of two call progRess data code sequences representing the signal condition defined by the applied data signals and transmitting the call progress data code sequence to the calling transmission channel by way of the intraoffice channel associated therewith.
Claim 24
Dependent Claim
155 words
In a line switching office for interconnecting two-way data transmission channels, a plurality of two-way intraoffice channels, an interface circuit for connecting each of the transmission channels to an associated one of the intraoffice channels, and switch means for interconnecting the intraoffice channel associated with a calling transmission channel to the intraoffice channel associated with an available called transmission channel; CHARACTERIZED BY means in each of the interface circuits responsive to a first and second signal conditions on the transmission channel for applying data signals defining the signal condition on the transmission channel to the associated intraoffice channel, and common control means responsive to the application of data signals to the intraoffice channel interconnection for generating one of two call progRess data code sequences representing the signal condition defined by the applied data signals and transmitting the call progress data code sequence to the calling transmission channel by way of the intraoffice channel associated therewith.
Claim 25
Dependent Claim
56 words
In a line switching office, in accordance with claim 20, wherein the common control means generates a first call progress data code sequence in response to applied data signals defining an idle on-hook signal condition and generates a second call progress data code sequence in response to applied data signals defining a not-ready on-hook signal condition.
Claim 26
Dependent Claim
36 words
In a line switching office in accordance with claim 20, wherein the common control means includes means for generating a call progress data code sequence in response to applied data signals defining an off-hook signal condition.
Claim 27
Dependent Claim
40 words
In a line switching office, in accordance with claim 20, wherein the common control means includes means effective upon the interconnection operation of the switch means for initiating the generation of a specific one of the call progress code sequences.
Claim 28
Dependent Claim
50 words
In a line switching office, in accordance with claim 23, wherein the common control means includes means responsive to the applied data signals for modifying the content of the specific one of the call progress code sequences to conform to the call progress code sequence representing the applied data signals.
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) | 1978-12-08 | 1979-06-09 | 1979-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-08 | 1983-06-09 | 1983-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-08 | 1987-06-09 | 1987-12-09 | $7700.00 | Window Closed / Lapsed |