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EP0578437A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Arrangement for synchronizing data signals in an optical switched system

Assignee: AT&T Inc
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Filing: 1993-06-30
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Granted: —
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Expires: 2013-06-30
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Abstract

Abstract A synchronization arrangement achieves very fast synchronization for a received data signal in an optical switched system. Phase synchronization of received data (201) with an internal clock (216) at the receiver is provided by synchronizing the received data to the internal clock. In the operation of the arrangement, the received data signal from a remote transmitter is reproduced a predetermined number of times and each one of the reproduced data signals is coupled through one of an array of delay lines (203). Each delay line has a different delay and is arranged in an increasing order such that progressively longer or staggered delays for the received data signal is provided in the form of these reproduced, delayed data signals. Each one of the reproduced, delayed data signals is examined for determining the period of time therein during which the incoming data is high and the period of time during which this data is low, in relation to the internal clock signal. With the phase relationship between each delayed data signal and the internal clock determined, the synchronizing arrangement selects the correct one of the delayed data signals which is most closely in phase alignment with the internal clock at the receiver. Once the received data is synchronized, the receiver works completely synchronously without any additional clock adaptation for the period of receipt of the received data.

Inventors

  • 👤 John V. Camlet
  • 👤 Walter M. Pitio
  • 👤 Donald D. Shugard

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-03 05:33
CPC Classifications
H; H04; H04L; H04L7/00; H04L7/02; H04L7/033; H04L7/0337; H04L7/0338; H04Q; H04Q11/00; H04Q11/0001; H04L7/04; H04L7/041; H04L7/046; H04Q11/0062; H04Q11/0066

Claims Analysis

Total Claims: 15
Claim 1
Independent Claim 57 words
A data synchronizing arrangement comprising: clock signal means (216); CHARACTERIZED BY means (202, 203, 209) for generating a plurality of progressively delayed data signals representative of an input data signal; and means (210-214) for selecting from the plurality of progressively delayed data signals a delayed data signal that is substantially in phase alignment with the clock signal.
Claim 2
Dependent Claim 50 words
The data synchronizing arrangement of claim 1 wherein the means for generating the plurality of progressively delayed data signals includes means (202) for reproducing the received data signal a predetermined number of times and means (203) for delaying each one of the reproduced data signals in an increasing ordered amount.
Claim 3
Dependent Claim 66 words
The data synchronizing arrangement of claim 2 wherein the selecting means includes means (210) for examining each one of the reproduced data signals for determining the phase relationship of each reproduced data signal to the clock signal and means (212) for generating a select data signal indicative of the correct one of the reproduced data signals that is substantially in phase alignment with the clock signal.
Claim 4
Dependent Claim 44 words
The data synchronizing arrangement of claim 3 wherein the examining means further includes means (204) for sampling each one of the reproduced data signals for determining when the data in each signal is in a high state, a low state or a transition state.
Claim 5
Dependent Claim 29 words
The data synchronizing arrangement of claim 4 wherein the sampling means generates a pattern reflective of an instantaneous state of the data in each one of the reproduced signals.
Claim 6
Dependent Claim 33 words
The data synchronizing arrangement of claim 5 wherein the examining means examines the pattern generated by the sampling means for determining the phase relationship of each reproduced data signal to the clock signal.
Claim 7
Dependent Claim 34 words
The data synchronizing arrangement of claim 3 wherein the select data signal provides means for selecting in a multiplier (210) the reproduced data signal that is substantially in phase alignment with the clock signal.
Claim 8
Dependent Claim 35 words
The data synchronizing arrangement of claim 8 wherein the clock signal generating means comprises a local clock, the local clock providing the clock signal for phase synchronizing the received data signal to said clock signal.
Claim 9
Independent Claim 52 words
A method of synchronizing a received data signal with a clock signal, CHARACTERIZED BY: generating a plurality of progressively delayed data signals representative of the received data signal; and selecting from the plurality of progressively delayed data signals a delayed data signal that is substantially in phase alignment with the clock signal.
Claim 10
Dependent Claim 54 words
The method of synchronizing a received data signal as in claim 10 wherein the generating step further includes the steps of reproducing the received data signal a predetermined number of times and delaying each one of the reproduced data signals in an increasing ordered amount for providing the plurality of progressively delayed data signals.
Claim 11
Dependent Claim 68 words
The method of synchronizing a received data signal as in claim 11 wherein the selecting step includes the steps of examining each one of the reproduced data signals for determining the phase relationship of each reproduced data signal to the clock signal and generating a select data signal indicative of the correct one of the reproduced data signals that is substantially in phase alignment with the clock signal.
Claim 12
Dependent Claim 49 words
The method of synchronizing a received data signal as in claim 12 wherein the examining step further includes the step of sampling each one of the reproduced data signals for determining when the data in each signal is in a high state, a low state or a transition state.
Claim 13
Dependent Claim 38 words
The method of synchronizing a received data signal as in claim 13 wherein the sampling step includes the step of generating a pattern reflective of an instantaneous state of the data in each one of the reproduced signals.
Claim 14
Dependent Claim 45 words
The method of synchronizing a received data signal as in claim 14 wherein the sampling step further includes the step of examining the generated pattern for determining the correct one of the reproduced data signals that is substantially in phase alignment with the clock signal.
Claim 15
Dependent Claim 35 words
The method of synchronizing a received data signal as in claim 12 wherein the select data signal selects in a multiplier the reproduced data signal that is substantially in phase alignment with the clock signal.

References Cited (Backward Citations)

GB2171577A Cited
US4928290A Cited
EP0436958A2 Cited

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