Multiplex communications – Wide area network – Packet switching
Patent
1990-11-29
1992-03-31
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370106, H04J 116, H04J 306
Patent
active
051014017
ABSTRACT:
In order to judge whether a received digital signal has a true polarity or an inverted polarity, a polarity judging arrangement comprises first and second synchronization word detecting circuits for detecting, from the received digital signal, first and second predetermined synchronization words for multiframe and frame synchronization signals, respectively. The second predetermined synchronization word is defined by inverting the first predetermined synchronization word. Each multiframe has at least two frame synchronization signals. A counting circuit has an initial value and counts down and up a count in response to first and second detection pulses produced by the first and the second synchronization word detecting circuits, respectively. The counting circuit produces first and second judgement result signals representative of the true and the inverted polarities when the count increases up to an upper threshold value and when the count decreases down to a lower threshold value, respectively. The upper threshold value is higher than the initial value by a preselected value M, M representing an integer greater than one. The lower threshold value is lower than the initial value by the preselected value. Use may be made of another counting circuit which counts up and down a count in response to the first and the second detection pulses, respectively.
REFERENCES:
patent: 4070646 (1978-01-01), Sandlin
patent: 4176248 (1979-11-01), Sheets
patent: 4665533 (1987-05-01), Tomikawa
patent: 4731827 (1988-03-01), Wood
patent: 4768192 (1988-08-01), Pattavina et al.
patent: 4860311 (1989-08-01), Storberg
Kanetake Kenji
Suzuki Toshio
Kizou H.
NEC Corporation
Olms Douglas W.
LandOfFree
Polarity judging arrangement by using frame synchronization sign does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Polarity judging arrangement by using frame synchronization sign, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Polarity judging arrangement by using frame synchronization sign will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2264633