US4903261A
Expired / Lapsed
US
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Synchronous packet voice/data communication system
Assignee: Cisco Technology Inc
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Filing: 1988-03-09
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Granted: 1990-02-20
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Expires: 2008-03-09
Abstract
Abstract A packet communications network and apparatus for communicating information in voice and data packets transmits and receives voice and data in accordance with standardized frames of a standardized communications format such as a standard DS-1 type trunk. An apparatus is coupled to multiplex standardized channels into a single channel wherein voice or data signals are packetized into independently addressable packets synchronized on, for example, the DS-1 frame. The network includes voice and packet data concentration apparatus operable in a multiple node trunk environment to concentrate signals into independently addressable synchronously switchable packets, thereby to provide an efficient (high density capacity) interface between trunk terminations. Up to four times as much information can be transferred between nodes with the ability to switch between nodes as compared to conventional TDM and PCM communication without compression without the ability to switch between nodes.
Inventors
- 👤 Paul Baran
- 👤 Charles M. Corbalis
- 👤 Brian D. Holden
- 👤 Jon K. Masatsugu
- 👤 Lewis J. Marggraff
- 👤 David P. Owen
- 👤 Peter W. J. Stonebridge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:45
CPC Classifications
H; H04; H04M; H04M7/00; H04M7/006; H04L; H04L12/00; H04L12/64; H04Q; H04Q2213/00; H04Q2213/13031; H04Q2213/13034; H04Q2213/1309; H04Q2213/13096; H04Q2213/13103; H04Q2213/13174; H04Q2213/13196; H04Q2213/13201; H04Q2213/13216; H04Q2213/1322; H04Q2213/13292; H04Q2213/13299
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
168 words
A communications network for communicating digitized voice and data in separate and distinct packets, said network comprising: a digital communications medium having at least a first node and a second node, said digital communications medium being operative to communicate standardized bit synchronous digital time frames of information according to a standardized bit synchronous communications format having a predetermined bit synchronous framing structure; and means for coupling digital signals bit synchronously to said digital communications medium at said first node, said coupling means including means for packetizing signals into digitized information packets, each said digitized information packet having a packet format which is self contained as to destination and content and which conforms bit synchronously to said bit synchronous communications format and to boundaries of said standardized bit synchronous digital time frames such that packets are communicated from said first node to said second node bit synchronously with reference to said communications medium within said standardized bit synchronous communications format such that an additional framing structure is not needed.
Claim 2
Dependent Claim
168 words
A communications network for communicating digitized voice and data in separate and distinct packets, said network comprising: a digital communications medium having at least a first node and a second node, said digital communications medium being operative to communicate standardized bit synchronous digital time frames of information according to a standardized bit synchronous communications format having a predetermined bit synchronous framing structure; and means for coupling digital signals bit synchronously to said digital communications medium at said first node, said coupling means including means for packetizing signals into digitized information packets, each said digitized information packet having a packet format which is self contained as to destination and content and which conforms bit synchronously to said bit synchronous communications format and to boundaries of said standardized bit synchronous digital time frames such that packets are communicated from said first node to said second node bit synchronously with reference to said communications medium within said standardized bit synchronous communications format such that an additional framing structure is not needed.
Claim 3
Dependent Claim
62 words
The network according to claim 1 wherein said communications medium further includes at least a third node and wherein said coupling means further includes means for switching said digitized information packet at least from said first node to said second node or to said third node wherein at least said first, second and third nodes maintain packet switching synchronization with one another.
Claim 4
Dependent Claim
50 words
The network according to claim 2 wherein said switching means further includes means for switching said digitized information packet at least from said first node to said second node and then to said third wherein at least said first, second and third nodes maintain packet switching synchronization with one another.
Claim 5
Dependent Claim
50 words
The network according to claim 1 wherein said standardized communications format is a DS-1 Trunk Communications format having a 193 bit frame and wherein each said digitized information packet has as a format a 24-bit address and error correction field and a 168-bit information field and a 1-bit synchronization field.
Claim 6
Dependent Claim
27 words
The network according to claim 4 wherein said digitized information packet may be a voice packet, said voice packet employing a four-bit voice code in normal operation.
Claim 7
Dependent Claim
27 words
The network according to claim 4 wherein said digitized information packet may be a data packet, said data packet employing an 8-bit data byte in normal operation.
Claim 8
Dependent Claim
30 words
The network according to claim 1 wherein said packetizing means includes means for switching individual voice and data packets with a delay of less than eighteen milliseconds during normal operation.
Claim 9
Dependent Claim
18 words
The network according to claim 7 wherein said packetizing means creates and forwards individual voice and data packets.
Claim 10
Dependent Claim
27 words
The network according to claim 5 wherein said packetizing means creates and forwards individual voice packets with a delay not greater than eighteen milliseconds during normal operation.
Claim 11
Dependent Claim
26 words
The network according to claim 1 wherein said digitized information packet is a voice packet, said voice packet employing a 4-bit voice code in normal operation.
Claim 12
Dependent Claim
26 words
The network according to claim 1 wherein said digitized information packet is a data packet, said data packet employing and 8-bit data byte in normal operation.
Claim 13
Dependent Claim
215 words
For use in a communications network for communicating data and voice in separate and distinct information packets, including voice packets and data packets, through a bit synchronous digital communications medium, an apparatus for coupling digital signals to said communications medium comprising: a multiplexing bus, said multiplexing bus including a clock line for synchronizing said information packets; a multiplexing bus controller coupled to said multiplexing bus and operative to generate a clock signal said clock line to control switching of said information packets, said information packets comprising independently addressable digital data conforming to a standardized bit synchronous time frame and a standardized bit synchronous communications format having a predetermined bit synchronous framing structure; means for packetizing signals into digitized information packets, each said digitized information packet having a packet format which is self-contained as to destination and content and which conforms to boundaries of said standardized bit synchronous time frame; and first digital communications means coupled to said multiplexing bus for transmitting said information packets to said bit synchronous digital communications medium and for receiving said information packets from said bit synchronous digital communications medium, said first digital communications means being operative to communicate said information packets bit synchronously according to said standardized bit synchronous communications format such that an additional framing structure is not needed.
Claim 14
Dependent Claim
215 words
For use in a communications network for communicating data and voice in separate and distinct information packets, including voice packets and data packets, through a bit synchronous digital communications medium, an apparatus for coupling digital signals to said communications medium comprising: a multiplexing bus, said multiplexing bus including a clock line for synchronizing said information packets; a multiplexing bus controller coupled to said multiplexing bus and operative to generate a clock signal said clock line to control switching of said information packets, said information packets comprising independently addressable digital data conforming to a standardized bit synchronous time frame and a standardized bit synchronous communications format having a predetermined bit synchronous framing structure; means for packetizing signals into digitized information packets, each said digitized information packet having a packet format which is self-contained as to destination and content and which conforms to boundaries of said standardized bit synchronous time frame; and first digital communications means coupled to said multiplexing bus for transmitting said information packets to said bit synchronous digital communications medium and for receiving said information packets from said bit synchronous digital communications medium, said first digital communications means being operative to communicate said information packets bit synchronously according to said standardized bit synchronous communications format such that an additional framing structure is not needed.
Claim 15
Dependent Claim
23 words
The apparatus according to claim 12 further including means coupled to said multiplexing bus for compressing voice signals and for decompressing voice signals.
Claim 16
Dependent Claim
23 words
The apparatus according to claim 13 wherein said voice packets are dropped in the event of over capacity operation of said communications medium.
Claim 17
Dependent Claim
54 words
The apparatus according to claim 12 further including at least one packet framing transceiver for receiving and transmitting digitized information packets according to said standardized communications format, and means coupling said packet transceiver to said communications medium, said packet transceiver further including means for coupling address, timing and information signals to said multiplexing bus.
Claim 18
Dependent Claim
46 words
The apparatus according to claim 15 wherein said packet transceiver comprises: means for inserting framing and signaling information into a standardized time frame in said standardized communications format; and means for extracting framing and signaling information from a standardized time frame in said standardized communication format.
Claim 19
Dependent Claim
38 words
The apparatus according to claim 16 wherein said packet framing transceiver further includes means coupled to said multiplexing bus for receiving and serially forwarding said information packet, and means coupled to said multiplexing bus for transferring TDM signals.
Claim 20
Dependent Claim
45 words
The apparatus according to claim 12 wherein said packet control unit includes: a packet receiver coupled to said multiplexing bus; a packet transmitter coupled to said multiplexing bus; and a multiplexing bus controller coupled to said multiplexing bus for controlling operation of said multiplexing bus.
Claim 21
Dependent Claim
59 words
The apparatus according to claim 12 wherein said standardized communication format is a DS-1 trunk communication format having a 193 bit frame and wherein each said information packet has a format comprising an 168 bit data packet field and a 24 bit address and error correction field, said packet format being confined to one information packet per standardized frame.
Claim 22
Dependent Claim
19 words
The apparatus according to claim 19 wherein said information packet employs a four bit voice code in normal operation.
Claim 23
Dependent Claim
232 words
For use in a communications network for communicating data and voice in separate and distinct information packets, including voice packets and data packets, through a bit synchronous digital communications medium, an apparatus for coupling digital signals to said communications medium comprising: a multiplexing bus, said multiplexing bus including a clock line for synchronizing said information packets; a multiplexing bus controller coupled to said multiplexing bus and operative to generate a clock signal on said clock line to control switching of said information packets, said information packets comprising independently addressable digital data conforming to a standardized bit synchronous time frame and a standardized bit synchronous communications format; means coupled to said multiplexing bus for compressing voice signals and for decompressing voice signals; means for packetizing signals into digitized information packets, each said digitized information packet having a packet format which is self-contained as to destination and content and which conforms to boundaries of said standardized bit synchronous time frame; and first digital communications means coupled to said multiplexing bus for transmitting said information packets to said bit synchronous digital communications medium and for receiving said information packets from said bit synchronous digital communications medium, said first digital communications means being operative to communicate said information packets bit synchronously according to said standardized bit synchronous communications format, wherein said voice packets are dropped in the event of over capacity operation of said communications medium.
Claim 24
Dependent Claim
232 words
For use in a communications network for communicating data and voice in separate and distinct information packets, including voice packets and data packets, through a bit synchronous digital communications medium, an apparatus for coupling digital signals to said communications medium comprising: a multiplexing bus, said multiplexing bus including a clock line for synchronizing said information packets; a multiplexing bus controller coupled to said multiplexing bus and operative to generate a clock signal on said clock line to control switching of said information packets, said information packets comprising independently addressable digital data conforming to a standardized bit synchronous time frame and a standardized bit synchronous communications format; means coupled to said multiplexing bus for compressing voice signals and for decompressing voice signals; means for packetizing signals into digitized information packets, each said digitized information packet having a packet format which is self-contained as to destination and content and which conforms to boundaries of said standardized bit synchronous time frame; and first digital communications means coupled to said multiplexing bus for transmitting said information packets to said bit synchronous digital communications medium and for receiving said information packets from said bit synchronous digital communications medium, said first digital communications means being operative to communicate said information packets bit synchronously according to said standardized bit synchronous communications format, wherein said voice packets are dropped in the event of over capacity operation of said communications medium.
References Cited (Backward Citations)
EP0058982A1
Cited
US4408323A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-02-19 | 1993-08-21 | 1994-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-19 | 1997-08-21 | 1998-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-19 | 2001-08-21 | 2002-02-20 | $7700.00 | Window Closed / Lapsed |