EP0318333A1
Expired / Lapsed
EP
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Stations for a digital communications network
Assignee: British Telecommunications PLC
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Filing: 1988-11-28
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Granted: —
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Expires: 2008-11-28
Abstract
Abstract A central station (4) for a digital communications network, arranged to transmit data to outstations (8) in the form of a stream of frames, each frame comprising a first portion containing a synchronisation signal and housekeeping data for the outstations, the central station (4) comprising a first scrambling means arranged to scramble the contents of said first portions in accordance with a first predetermined binary sequence, and a second scrambling means arranged to scramble the contents of said second portions in accordance with a second predetermined binary sequence.
Inventors
- 👤 John William Ballance
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 14:15
CPC Classifications
H; H04; H04J; H04J3/00; H04J3/02; H04J3/06; H04J3/0635; H04J3/0682; H04B; H04B10/00; H04B10/27; H04B10/272; H04B10/50; H04J14/00; H04J14/08; H04J3/0602; H04J3/0605; H04L; H04L25/00; H04L25/02; H04L25/03; H04L25/03828; H04L25/03866
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
85 words
A central station for a digital communications network, arranged to transmit data to outstations in the form of a stream of frames, each frame comprising a first portion containing a synchronisation signal and housekeeping data for the outstations, the central station comprising a first scrambling means arranged to scramble the contents of said first portions in accordance with a first predetermined binary sequence, and a second scrambling means arranged to scramble the contents of said second portions in accordance with a second predetermined binary sequence.
Claim 2
Dependent Claim
85 words
A central station for a digital communications network, arranged to transmit data to outstations in the form of a stream of frames, each frame comprising a first portion containing a synchronisation signal and housekeeping data for the outstations, the central station comprising a first scrambling means arranged to scramble the contents of said first portions in accordance with a first predetermined binary sequence, and a second scrambling means arranged to scramble the contents of said second portions in accordance with a second predetermined binary sequence.
Claim 3
Dependent Claim
32 words
A central station as claimed in Claim 1 wherein the first and second scrambling means share a single binary sequence generator and utilize respective taps of a shift register of the generator.
Claim 4
Dependent Claim
100 words
An outstation for a digital communications network, arranged to receive frames from a central station as claimed in Claim 1, the outstation comprising a first descrambling means for descrambling the contents of said first portions in accordance with said first predetermined binary sequence, a second descrambling means for descrambling the contents of said second portions in accordance with said second predetermined binary sequence, and means responsive to a synchronization signal in the frames to select said second descrambling means at the start of said second portions and to select said first descrambling means at the start of said first portions.
Claim 5
Dependent Claim
31 words
An outstation as claimed in Claim 3 wherein the first and second descrambling means share a single binary sequence generator and utilize respective taps of a shift register of the generator.
References Cited (Backward Citations)
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