US4697264A
Expired / Lapsed
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Bit compression multiplexing
Assignee: Nokia Bell Labs
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Filing: 1985-10-10
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Granted: 1987-09-29
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Expires: 2005-10-10
Abstract
Abstract A bit compression multiplexer for a pair of time division multiplexed digital bit streams each one of which includes a plurality of PCM encoded signals deposited in separate and distinct channels and signaling bits multiplexed therewith. The encoded signals are bit compressed (22), and then multiplexed and grouped (25) into clusters. Each of the multiplexed compressed signals occupies a separate and distinct channel of a repetitive frame that includes a plurality of clusters and a corresponding number of additional channels, called delta channels, each one of which is associated with a given cluster and is proximate thereto. The signaling bits are extracted (21) from the pair of digital bit streams, reformatted (24) and then placed in predetermined bit positions of the delta channels. The signaling bits in a given delta channel are associated with the compressed signals of a cluster proximate thereto. The combination of a cluster and its related delta channel comprise a bundle. A framing bit pattern is developed (23) for each bundle and the framing bits are placed into a predetermined bit position of each of the delta channels.
Inventors
- 👤 Duane Galensky
- 👤 Warren G. Hammett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:35
CPC Classifications
H; H04; H04J; H04J3/00; H04J3/16; H04J3/1682; H04J3/1688; H04J3/02; H04J3/04; H04J3/047
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
247 words
A bit compression multiplexing system for a pair of time division multiplexed digital bit streams each of which includes a plurality of PCM encoded signals in separate and distinct channels of a repetitive frame and signaling bits multiplexed therewith comprising: means (22) for bit-rate compressing the PCM encoded signals into differential PCM signals; means (25) for multiplexing the compressed differential PCm signals and grouping the same into clusters, each of the clusters including predetermined number of compressed signal channels and each of the compressed differential PCM signals occupying a separate and distinct channel of a repetitive frame that includes a plurality of said clusters and a corresponding plurality of additional channels each one of which is associated with a given cluster and is proximate thereto, wherein a predetermined number of said repetitive frames forms a repetitive superframe; means (21, 24, 25) for extracting and reformatting the signaling bits of said time division multiplexed digital bit streams and placing the same in predetermined ones of said plurality of additional channels in the repetitive frames of said superframe, the signaling bits in a given additional channel being associated with the compressed differential PCM signals of a cluster proximate thereto; and means (23, 24) for developing a framing bit pattern for each of said plurality of clusters and for inserting the bits of the same into a predetermined bit position of the additional channel associated with an proximate to each of said clusters in the reptitive frames of said superframe.
Claim 2
Dependent Claim
247 words
A bit compression multiplexing system for a pair of time division multiplexed digital bit streams each of which includes a plurality of PCM encoded signals in separate and distinct channels of a repetitive frame and signaling bits multiplexed therewith comprising: means (22) for bit-rate compressing the PCM encoded signals into differential PCM signals; means (25) for multiplexing the compressed differential PCm signals and grouping the same into clusters, each of the clusters including predetermined number of compressed signal channels and each of the compressed differential PCM signals occupying a separate and distinct channel of a repetitive frame that includes a plurality of said clusters and a corresponding plurality of additional channels each one of which is associated with a given cluster and is proximate thereto, wherein a predetermined number of said repetitive frames forms a repetitive superframe; means (21, 24, 25) for extracting and reformatting the signaling bits of said time division multiplexed digital bit streams and placing the same in predetermined ones of said plurality of additional channels in the repetitive frames of said superframe, the signaling bits in a given additional channel being associated with the compressed differential PCM signals of a cluster proximate thereto; and means (23, 24) for developing a framing bit pattern for each of said plurality of clusters and for inserting the bits of the same into a predetermined bit position of the additional channel associated with an proximate to each of said clusters in the reptitive frames of said superframe.
Claim 3
Dependent Claim
31 words
A bit compression multiplexing system as defined in claim 1 wherein a frame of compressed signals is of the same duration as a frame of said pair of digital bit streams.
Claim 4
Dependent Claim
24 words
A bit compression multiplexing system as defined in claim 2 wherein each of the pair of multiplexed digital bit streams carries sixteen state signaling.
Claim 5
Dependent Claim
30 words
A bit compression multiplexing system as defined in claim 2 wherein a predetermined bit position of each of said dditional channels is reserved to provide low bit rate data links.
Claim 6
Dependent Claim
34 words
A bit compression multiplexing system as defined in claim 2 including means (47) coupled to the multiplexing means for periodically inserting an alarm bit in a given additional channel to indicate a bundle-alarm condition.
Claim 7
Dependent Claim
18 words
A bit compression multiplexing system as defined in claim 2 wherein the digital bit streams are DS1 signals.
Claim 8
Dependent Claim
240 words
A bit compression multiplexing method for a pair of time division multiplexed digital bit streams each of which includes a plurality of PCM encoded signals in separate and distinct channels of a repetitive frame and signaling bits multiplexed therewith comprising the steps of: bit-rate compressing the encoded PCM signals into differential PCM signals; multiplexing the compressed differential PCM signals and grouping the same into clusters, each of the clusters including a predetermined number of multiplexed compressed signal channels and each of the compressed differential PCM signals occupying a separate and distinct channel of a repetitive frame that includes a plurality of said clusters and a corresponding plurality of additional channels each one of which is associated with a given cluster and is proximate thereto, wherein a predetermined number of said repetitive frames forms a repetitive superframe; extracting the signaling bits from the pair of time division multiplexed digital bit streams; reformatting the extracted signaling bits and placing the same in predetermined bit positions of said additional channels in the repetitive frames of said superframe, the signaling bits in a given additional channel being associated with the compressed differential PCM signals of a cluster proximate thereto; and developing a framing bit pattern for each of said plurality of clusters and inserting the bits of the same into a predetermined bit position of the additional channel associated with and proximate to each of said clusters in the repetitive frames of said superframe.
Claim 9
Dependent Claim
240 words
A bit compression multiplexing method for a pair of time division multiplexed digital bit streams each of which includes a plurality of PCM encoded signals in separate and distinct channels of a repetitive frame and signaling bits multiplexed therewith comprising the steps of: bit-rate compressing the encoded PCM signals into differential PCM signals; multiplexing the compressed differential PCM signals and grouping the same into clusters, each of the clusters including a predetermined number of multiplexed compressed signal channels and each of the compressed differential PCM signals occupying a separate and distinct channel of a repetitive frame that includes a plurality of said clusters and a corresponding plurality of additional channels each one of which is associated with a given cluster and is proximate thereto, wherein a predetermined number of said repetitive frames forms a repetitive superframe; extracting the signaling bits from the pair of time division multiplexed digital bit streams; reformatting the extracted signaling bits and placing the same in predetermined bit positions of said additional channels in the repetitive frames of said superframe, the signaling bits in a given additional channel being associated with the compressed differential PCM signals of a cluster proximate thereto; and developing a framing bit pattern for each of said plurality of clusters and inserting the bits of the same into a predetermined bit position of the additional channel associated with and proximate to each of said clusters in the repetitive frames of said superframe.
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) | 1990-09-28 | 1991-03-30 | 1991-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-09-28 | 1995-03-30 | 1995-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-09-28 | 1999-03-30 | 1999-09-29 | $7700.00 | Window Closed / Lapsed |