Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
175 words
A fault detecting system employed in at least first and second stations coupled to each other via a carrier band type LAN (local area network), said fault detecting system comprising: signal trail detecting means for detecting a signal trail of a solicit-successor frame contained in a transmission signal to produce a trail start-timing detection signal; carrier detecting means for detecting a carrier signal component contained in a reflection signal of said signal trail, which has been reflected from a fault occurrence location on said local area network, within a response window frame, to reduce a reflection end-timing detection signal; timer means for measuring a time period after said trail start-timing signal is produced from said signal trail detecting means until said reflection end-timing detection signal is produced from said carrier detecting means; and, processing means for processing time periods derived from said timer means of fault detecting systems employed in said first and second stations to calculate a distance from said fault occurrence location on said LAN to each of said first and second stations.
Claim 2
Dependent Claim
175 words
A fault detecting system employed in at least first and second stations coupled to each other via a carrier band type LAN (local area network), said fault detecting system comprising: signal trail detecting means for detecting a signal trail of a solicit-successor frame contained in a transmission signal to produce a trail start-timing detection signal; carrier detecting means for detecting a carrier signal component contained in a reflection signal of said signal trail, which has been reflected from a fault occurrence location on said local area network, within a response window frame, to reduce a reflection end-timing detection signal; timer means for measuring a time period after said trail start-timing signal is produced from said signal trail detecting means until said reflection end-timing detection signal is produced from said carrier detecting means; and, processing means for processing time periods derived from said timer means of fault detecting systems employed in said first and second stations to calculate a distance from said fault occurrence location on said LAN to each of said first and second stations.
Claim 3
Dependent Claim
42 words
A fault detecting system as claimed in claim 1, wherein said signal trail detecting means includes three 8-bit shift registers and an 8-stage binary counter to detect at least both a start delimiter and an end delimiter contained in a transmission signal.
Claim 4
Dependent Claim
24 words
A fault detecting system as claimed in claim 1, wherein said carrier detecting means includes an inverter, a NAND gate, and a D flip-flop.
Claim 5
Dependent Claim
32 words
A fault detecting system as claimed in claim 1, wherein said timer means includes a pair of synchronous binary counters, a 3-stage latch circuit, and an oscillator having a 100 MHz clock.
Claim 6
Dependent Claim
60 words
A fault detecting system as claimed in claim 4, wherein said distance from said fault occurrence location on said LAN to each of said first and second stations is calculated as follows: L=x*2 (km/count value) where "L" is said distance, "x" represents a count value of said binary counter, and 2 (km/count value) is defined by said 100 MHz oscillator.