US4201890A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiport digital switching element
Assignee: Nokia of America Corp
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Filing: 1978-03-17
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Granted: 1980-05-06
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Expires: 1998-03-17
Abstract
Abstract A multiport single sided switching element is described for providing space and time switching between the input ports thereof and the output ports thereof in response to digital command signals for frames of digitally encoded data in a plurality of channels which is phase (bit) asynchronously coupled to any port of the switching element, the command signals being in for example the same channels as is the data. Every port of the single sided switching element is adaptable as either an inlet or an outlet and thus may be configured in a switching network as a one-sided, as a two-sided, or multisided switching element and includes a time division multiplexed bus for providing a space path between the ports of the switching element and further includes transmit and receive logic at each port responsive to command signals for coupling data from the input of any port to the TDM bus and additional logic at each port selectively responsive to command signals for bit synchronously extracting the data from the TDM bus in any channel thereby providing time slot interchange prior to coupling of data from the switching element to other switching elements. In a preferred embodiment, a sixteen port switching element is described.
Inventors
- 👤 Alan J. Lawrence
- 👤 Jeffrey N. Denenberg
- 👤 Murray Rubinstein
- 👤 Daniel C. Upp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:32
CPC Classifications
H; H04; H04Q; H04Q11/00; H04Q11/04; H04Q11/0407
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
217 words
A multiport switching element for providing and maintaining time and space switching for digitally encoded data received phase asynchronously in frames containing a plurality of channels of said data, said element coupling any of said channels at the input of the port receiving said channel to any channel at the output of any port in said element in response to digital command signals received by said port for said channel and in said channel, comprising: time division multiplexed common transmission bus means interconnecting said ports for providing a plurality of time slots, each time slot being dedicated to a particular channel of said frames coupled to the input of each port; means at each port responsive to said digital command signals for coupling said command signals and subsequent frames of data received in the channel in which said digital command signals are received to said common transmission bus means in the time slot dedicated to said channel; and means at each port selectively responsive to said digital command signals coupled to said common transmission bus means for extracting said frames of data from said common transmission bus means in the time slot dedicated to said input channel of said frames and for inserting said frames of data into the output channel designated by said digital command signals.
Claim 2
Dependent Claim
217 words
A multiport switching element for providing and maintaining time and space switching for digitally encoded data received phase asynchronously in frames containing a plurality of channels of said data, said element coupling any of said channels at the input of the port receiving said channel to any channel at the output of any port in said element in response to digital command signals received by said port for said channel and in said channel, comprising: time division multiplexed common transmission bus means interconnecting said ports for providing a plurality of time slots, each time slot being dedicated to a particular channel of said frames coupled to the input of each port; means at each port responsive to said digital command signals for coupling said command signals and subsequent frames of data received in the channel in which said digital command signals are received to said common transmission bus means in the time slot dedicated to said channel; and means at each port selectively responsive to said digital command signals coupled to said common transmission bus means for extracting said frames of data from said common transmission bus means in the time slot dedicated to said input channel of said frames and for inserting said frames of data into the output channel designated by said digital command signals.
Claim 3
Dependent Claim
52 words
A multiport switching element in accordance with claim 1 wherein said means responsive to said command signals includes control logic means responsive to said command signals for selecting ports such that said switching element is operable as either a single-sided switching element or as a multisided switching element within a switching network.
Claim 4
Dependent Claim
22 words
A multiport switching element in accordance with claim 2 wherein said digital command signals comprise-in-channel multibit data words addressing a particular port.
Claim 5
Dependent Claim
38 words
A multiport switching element in accordance with claim 2 wherein said digital command signals comprise in-channel multibit data words for sequentially addressing the ports of said switching element until an available channel at any addressed port is located.
Claim 6
Dependent Claim
47 words
A multiport single-sided switching element in accordance with claim 2 wherein said control logic means includes means responsive to said digital command signals for initiating a connection from any port via said common transmission bus to any free channel of any port addressed by said command signals.
Claim 7
Dependent Claim
76 words
A multiport switching element in accordance with claim 2 wherein said control logic means further includes: means for coupling data either into or out of said port in response to said command signals, and in the same channel as said command signals including receive control logic for providing bit and word synchronization for said data; and transmit control logic for bit-synchronously transmitting said data from said common transmission bus means bit serially out of said port.
Claim 8
Dependent Claim
126 words
A multiport switching element for providing space and time switching between any ports thereof in response to digital command signals for frames of digitally encoded data in a plurality of channels received bit asynchronously by said switching element, comprising: time division multiplexed common transmission bus means interconnecting said ports; means at each port responsive to said command signals in said channels for coupling said data in said channels bit-synchronously from any of said ports to said common transmission bus; and means at each port selectively responsive to said command signals for extracting said data from said transmission bus in the bus cycle for said channel and for serially transmitting said extracted data bit-synchronously in the output channel designated by said digital command signals from said port.
Claim 9
Dependent Claim
126 words
A multiport switching element for providing space and time switching between any ports thereof in response to digital command signals for frames of digitally encoded data in a plurality of channels received bit asynchronously by said switching element, comprising: time division multiplexed common transmission bus means interconnecting said ports; means at each port responsive to said command signals in said channels for coupling said data in said channels bit-synchronously from any of said ports to said common transmission bus; and means at each port selectively responsive to said command signals for extracting said data from said transmission bus in the bus cycle for said channel and for serially transmitting said extracted data bit-synchronously in the output channel designated by said digital command signals from said port.
Claim 10
Dependent Claim
24 words
A multiport switching element in accordance with claim 7 wherein said digitally encoded data comprises PCM encoded speech samples time multiplexed in said channels.
Claim 11
Dependent Claim
197 words
A multiport switching element for providing and maintaining time and space switching between any inlet port thereof and any outlet port thereof in response to in-channel digital command signals for frames of digitally encoded data in a plurality of channels bit asynchronously coupled to said switching element comprising: inlet port means for receiving and interpreting command signals in any of said channels, and for receiving data in any of said channels, subsequently to receiving said command signals in the same channel; time division multiplex common transmission bus means intercoupling said ports for providing a plurality of bus cycles, each dedicated to a particular channel; means for coupling said command signals from said inlet port bit-synchronously to said common transmission bus means and for coupling said data to said common transmission bus means in the same channels as said command signals; and outlet port means addressed by said digital command signals for coupling said data out of said port in any output channel designated by said command signals such that space switching is provided between said inlet port and said outlet port by said common transmission bus means and time switching is provided by the outlet port means.
Claim 12
Dependent Claim
197 words
A multiport switching element for providing and maintaining time and space switching between any inlet port thereof and any outlet port thereof in response to in-channel digital command signals for frames of digitally encoded data in a plurality of channels bit asynchronously coupled to said switching element comprising: inlet port means for receiving and interpreting command signals in any of said channels, and for receiving data in any of said channels, subsequently to receiving said command signals in the same channel; time division multiplex common transmission bus means intercoupling said ports for providing a plurality of bus cycles, each dedicated to a particular channel; means for coupling said command signals from said inlet port bit-synchronously to said common transmission bus means and for coupling said data to said common transmission bus means in the same channels as said command signals; and outlet port means addressed by said digital command signals for coupling said data out of said port in any output channel designated by said command signals such that space switching is provided between said inlet port and said outlet port by said common transmission bus means and time switching is provided by the outlet port means.
Claim 13
Dependent Claim
28 words
A multiport switching element in accordance with claim 9 wherein said data coupled to said inlet port means and coupled from said outlet port means is rate synchronous.
Claim 14
Dependent Claim
35 words
A multiport switching element in accordance with claim 10 wherein said multiport switching element includes sixteen ports, each of said ports being intercoupled to each other by said time division multiplex common transmission bus means.
Claim 15
Dependent Claim
39 words
A multiport switching element in accordance with claim 11 wherein said time division multiplex common transmission bus means provides a 16-port space switch in a single frame time and wherein said outlet port provides a multiple channel time switch.
Claim 16
Dependent Claim
24 words
A multiport switching element in accordance with claim 10 wherein said digitally encoded data is PCM encoded speech samples time multiplexed in said channels.
Claim 17
Dependent Claim
20 words
A multiport switching element in accordance with claim 13 wherein said PCM encoded speech samples are n-bit linear data bytes.
Claim 18
Dependent Claim
19 words
A multiport switching element in accordance with claim 10 wherein said digitally encoded data comprises multibit companded PCM samples.
Claim 19
Dependent Claim
18 words
A multiport switching element in accordance with claim 10 wherein said digitally encoded data comprises multiplexed data bytes.
Claim 20
Independent Claim
224 words
A method for establishing and maintaining time and space switching in a multiport switching element for digitally encoded data received phase asynchronously in frames containing a plurality of channels of data by coupling any of said channels received at the input of the port receiving said channel to any channel at the output of any port in said element in response to and designated by in-channel digital command signals received by said port for said channel and in said channel comprising the steps of: intercoupling said ports to a time division multiplexed common transmission bus such that a plurality of time slots each dedicated to a particular channel of said frames coupled to the input of each port are established; selectively coupling said frames of data at each port receiving said data in response to said digital command signals in the same channel as said data and preceding said data to said bus in the time slot dedicated to said channel such that said data is coupled phase synchronously to said bus; extracting said frames of data from said bus at each port selectively in response to said digital command signals and in the channels designated by said digital command signals; and phase synchronously coupling said extracted data from the output of said port and in the channels designated by said digital command signals.
Claim 21
Independent Claim
224 words
A method for establishing and maintaining time and space switching in a multiport switching element for digitally encoded data received phase asynchronously in frames containing a plurality of channels of data by coupling any of said channels received at the input of the port receiving said channel to any channel at the output of any port in said element in response to and designated by in-channel digital command signals received by said port for said channel and in said channel comprising the steps of: intercoupling said ports to a time division multiplexed common transmission bus such that a plurality of time slots each dedicated to a particular channel of said frames coupled to the input of each port are established; selectively coupling said frames of data at each port receiving said data in response to said digital command signals in the same channel as said data and preceding said data to said bus in the time slot dedicated to said channel such that said data is coupled phase synchronously to said bus; extracting said frames of data from said bus at each port selectively in response to said digital command signals and in the channels designated by said digital command signals; and phase synchronously coupling said extracted data from the output of said port and in the channels designated by said digital command signals.
Claim 22
Dependent Claim
38 words
A method in accordance with claim 17 further including the step of: selecting ports as inlets or outlets such that said switching element is operable as either a single-sided or a multisided switching element within a switching network.
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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) | 1983-05-06 | 1983-11-05 | 1984-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-05-06 | 1987-11-05 | 1988-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-05-06 | 1991-11-05 | 1992-05-06 | $7700.00 | Window Closed / Lapsed |