H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/28
H04B 7/24 (2006.01) G01R 23/15 (2006.01) G01R 29/033 (2006.01) H04L 1/24 (2006.01)
Patent
CA 1232023
ABSTRACT OF THE DISCLOSURE This invention provides an apparatus for supervising a digital radio transmission path between a transmitter and a receiver, in which the transmitter transmits a message including a data signal and a predetermined bit pattern portion, the portion being used for error rate detection; the receiver receives the portion, produces error pulses from the portion by comparing the portion to a reference and supervises the transmission path quality based on the produced error pulses to issue a path switching command when the detected error rate exceeds a predetermined threshold value. The apparatus comprises a device for producing a first number equal to the number of received error pulses by counting the received errors in the portion and for producing a second number proportional to a time interval between two successive error pulses; and a comparison unit which receives the first number obtained by counting the received error pulses and the second number produced in accordance with the time interval between two successive error pulses, and produces the line switching command when the first number is greater than or equal to the second number. The supervisory system rapidly detects deterioration in the quality of the digital radio transmission line and performs the line switching when such deterioration is detected.
464445
Fujitsu Limited
Mcfadden Fincham
LandOfFree
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