H - Electricity – 04 – L
Patent
H - Electricity
04
L
325/1, 325/36, 3
H04L 1/00 (2006.01) H04N 17/00 (2006.01)
Patent
CA 1219931
-11- Abstract of the Disclosure The suitability of a transmission path (16 or 18) for transmission of digital data is monitored by trans- mitting a test signal over the transmission path. The test signal is composed of a succession of video signal lines each including a horizontal sync pulse and a pattern of digital 1's and 0's at a predeter- mined frequency and occurring on each line at the same data positions relative to the horizontal sync pulse. The patterns comprise a reference pattern of alter- nating 1's and 0's and test pattern of 1's and 0's at random or in a sequence known to be disruptive to the transmission path. The test signal is received and is displayed on a waveform monitor (28) with the refer- ence pattern and the test pattern interleaved with the complement of the reference pattern and complement of the test pattern, so that the four patterns are super- imposed and enclose a generally eye-shaped area.
464880
Kirby Eades Gale Baker
Tektronix Inc.
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