EP0100608A2
Expired / Lapsed
EP
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Time compression multiplex digital transmission system
Assignee: Nortel Networks Ltd
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Filing: 1983-07-06
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Granted: —
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Expires: 2003-07-06
Abstract
Abstract A digital transmission system in which bursts of digital signals (B) are transmitted in opposite directions over a two wire telephone loop (2/W) at fixed frame intervals (F). Each signal burst is bounded by initial and final synchronization bits (0, 81 and 82, 163) at its beginning and ending respectively. Synchronization is established by determining coincidence of the final bit of one burst, the initial bit of the following burst, and two gating signals (81, 0) having an equivalent time interval therebetween.
Inventors
- 👤 Ephraim Arnon
- 👤 Michael Wayne Chomik
- 👤 Christopher John Barlow
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 14:11
CPC Classifications
H; H04; H04L; H04L5/00; H04L5/14; H04L5/1469; H04L5/1484; H04L5/1492
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
181 words
A digital transmission system comprising; means (50, 51, 52, 53, 54, 23) for transmitting bursts of digital signals of fixed length (B) and at fixed frame intervals (F), each burst including initial and final synchronization bits (0 and 81 or 82 and 163) at the beginning and ending respectively, of each burst; and means (11, 12, 20) for receiving the bursts of digital signals, including clock recovery means (14) for generating clock pulses synchronized to bits of the digital signals received from the transmitting means; characterized by comprising in the receiving means: - means (21, 22), responsive to the clock pulses, for generating first and second one bit period gating signals coincident with the anticipated reception of the initial and final synchronization bits respectively in each frame; and means (27, 28, 30) for generating a signal confirming frame synchronization (Q 2 =1), in response to the simultaneous occurrence of the second one bit period gating signal and the final synchronization bit of one frame, and the first one bit period gating signal and the initial synchronization bit of the following frame.
Claim 2
Dependent Claim
181 words
A digital transmission system comprising; means (50, 51, 52, 53, 54, 23) for transmitting bursts of digital signals of fixed length (B) and at fixed frame intervals (F), each burst including initial and final synchronization bits (0 and 81 or 82 and 163) at the beginning and ending respectively, of each burst; and means (11, 12, 20) for receiving the bursts of digital signals, including clock recovery means (14) for generating clock pulses synchronized to bits of the digital signals received from the transmitting means; characterized by comprising in the receiving means: - means (21, 22), responsive to the clock pulses, for generating first and second one bit period gating signals coincident with the anticipated reception of the initial and final synchronization bits respectively in each frame; and means (27, 28, 30) for generating a signal confirming frame synchronization (Q 2 =1), in response to the simultaneous occurrence of the second one bit period gating signal and the final synchronization bit of one frame, and the first one bit period gating signal and the initial synchronization bit of the following frame.
Claim 3
Dependent Claim
60 words
A digital transmission system as defined in claim 1 characterized by the confirming signal generating means including counter means (21, 22) for generating the first and second one bit period gating signals separated from each other by the fixed burst length, and separated from the next following first and second one bit period gating signals by the fixed frame interval.
Claim 4
Dependent Claim
166 words
A digital transmission system having a central station and a remote station each including transmitting and receiving means as defined in claim 1 for alternately transmitting and receiving bursts of digital signals over a single transmission path; and in which: the central station transmitting means initiates transmission of each burst at the fixed frame interval; the remote station transmitting means initiates transmission of each burst immediately after the remote station receives a burst from the central station transmitting means; characterized in that the central station receiving means includes an automatic line build out unit (11) at the input thereto; gating means (17) for feeding the received signal back to the automatic line build out unit to control the gain thereof; and means (23, 18) for disabling the gating means during transmission of each burst and for a preselected number of bit periods thereafter, so as to prevent perturbations resulting from the transmitted burst of digital signals on the single transmission path, controlling said unit (11) .
Claim 5
Dependent Claim
133 words
In a digital transmission system comprising: means (50, 51, 52, 53, 54, 23) for transmitting bursts of digital signals; and means (11, 12, 20) for receiving the bursts of digital signals; characterized by: in the transmitting means each transmitted burst beginning with an initial synchronization bit and ending with a final synchronization bit separated by a first preselected number of signal bits, the final synchronization bit separated by an interval equal to that of a second preselected number of signal bits from the initial synchronization bit of the following frame; and the receiving means including: means (22, 27, 28, 30) for detecting the presence of the initial synchronization bit, in a bit period occurring said second preselected number after detecting the final synchronization bit of the preceding frame, whereby frame synchronization is confirmed.
Claim 6
Dependent Claim
133 words
In a digital transmission system comprising: means (50, 51, 52, 53, 54, 23) for transmitting bursts of digital signals; and means (11, 12, 20) for receiving the bursts of digital signals; characterized by: in the transmitting means each transmitted burst beginning with an initial synchronization bit and ending with a final synchronization bit separated by a first preselected number of signal bits, the final synchronization bit separated by an interval equal to that of a second preselected number of signal bits from the initial synchronization bit of the following frame; and the receiving means including: means (22, 27, 28, 30) for detecting the presence of the initial synchronization bit, in a bit period occurring said second preselected number after detecting the final synchronization bit of the preceding frame, whereby frame synchronization is confirmed.
References Cited (Backward Citations)
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