Local network testing using carrier sense multiple access and collision detection (CSMA/CD)
First Claim
1. A tester for local networks having at least one elementary segment with a number of stations on the segment, each of said stations having a transmission and a reception circuit and an encoding/decoding circuit, the tester comprising:
- a transmission and reception circuit;
an encoding/decoding circuit;
means for detecting the presence of a transmission from a station;
said transmission and reception circuit including a collision generating means responsive to the detection of a transmission presence;
means for applying said frame of data through said encoding/decoding circuit to an elementary segment;
means for detecting collisions; and
means for verifying that said means for detecting collisions correctly detects collisions.
1 Assignment
0 Petitions
Accused Products
Abstract
A tester for local networks of the carrier sense multiple access and collision detection type with a bus architecture transmission system. The network includes at least one elementary segment comprising a number of stations. The tester includes a transmission and reception circuit analagous to those of the stations, including, in addition, a collision generating device which emits a data frame when it has received from the encoding and decoding circuit associated with the transmission and reception circuit, a signal indicating the presence of a transmission of a frame by some station other than itself, and a transmission request from the transmission control circuit, this transmitted frame being received by the encoding and decoding circuit.
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Citations
22 Claims
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1. A tester for local networks having at least one elementary segment with a number of stations on the segment, each of said stations having a transmission and a reception circuit and an encoding/decoding circuit, the tester comprising:
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a transmission and reception circuit; an encoding/decoding circuit; means for detecting the presence of a transmission from a station; said transmission and reception circuit including a collision generating means responsive to the detection of a transmission presence; means for applying said frame of data through said encoding/decoding circuit to an elementary segment; means for detecting collisions; and means for verifying that said means for detecting collisions correctly detects collisions. - View Dependent Claims (2)
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3. A tester for local networks having at least one elementary segment with a number of stations on the segment, each of said stations having a transmission and reception circuit and an encoding/decoding circuit, the tester comprising:
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a transmission and reception circuit; an encoding/decoding circuit, said transmission and reception circuit and said encoding/decoding circuit being substantially analogous to the comparable circuits in said stations; means for detecting the presence of a transmission from a station; means for generating a transmission request; a collision generating means, included at least in part in said transmission and reception circuit, said generating means being responsive to the detection of a transmission presence and the receipt of said transmission request for emitting a frame of data; means for applying said frame of data through said encoding/decoding circuit to an elementary segment; means for detecting collisions; and means for verifying that said means for detecting collisions correctly detects collisions. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10)
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11. A tester for local networks having at least one elementary segment with a number of stations on the segment, each of said stations having a transmission and reception circuit and an encoding/decoding circuit, the tester comprising:
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a transmission and reception circuit; an encoding/decoding circuit, said transmission and reception circuit and said encoding/decoding circuit being substantially analogous to the comparable circuits in said stations; means for detecting the presence of a transmission from a station; means for generating a transmission request; a collision generating means, included at least in part in said transmission and reception circuit, said generating means being responsive to the detection of a transmission presence and the receipt of said transmission request for emitting a frame of data; means for applying said frame of data through said encoding/decoding circuit to an elementary segment and means for operating said tester in a multicollision mode wherein the multicollision mode operating means includes means for detecting a collision, means for causing the collision generating means to generate a transmission request signal in response to said transmission request, to generate a transmission signal in response to the detection of a transmission presence, and to generate jamming data that are then transmitted over said network in response to a collision detection, transmission ceasing at the end of the jamming data, said transmission request signal, transmission signal and jamming data constituting a sequence, means for operating said causing means a predetermined number (n) of times to generate n successive sequences, and means responsive to the generation of the nth sequence for terminating the generation of said sequences. - View Dependent Claims (12, 13, 14)
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15. A tester for local networks having at least one elementary segment with a number of stations on the segment, each of said stations having a transmission and reception circuit and an encoding/decoding circuit, the tester comprising:
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a transmission and reception circuit; an encoding/decoding circuit, said transmission and reception circuit and said encoding/decoding circuit being substantially analogous to the comparable circuits in said stations; means for detecting the presence of a transmission from a station; means for generating a transmission request; a collision generating means, included at least in part in said transmission and reception circuit, said generating means being responsive to the detection of a transmission presence and the receipt of said transmission request for emitting a frame of data; said collision generating means includes collision authorization means operative in response to the detection of said transmission presence and to receipt of a transmission request for generating a collision authorization signal, and collision message generating means operative in response to said authorization signal for emitting said data frame; and means for applying said frame of data through said encoding/decoding circuit to an elementary segment.
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16. A tester for local networks having at least one elementary segment with a number of stations on the segment, each of said stations having a transmission and reception circuit and an encoding/decoding circuit, the tester comprising:
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a transmission and reception circuit; an encoding/decoding circuit, said transmission and reception circuit and said encoding/decoding circuit being substantially analogous to the comparable circuits in said stations; means for detecting the presence of a transmission from a station; means for generating a transmission request; a collision generating means, included at least in part in said transmission and reception circuit, said transmission means being responsive to the detection of a transmission presence and the receipt of said transmission request for emitting a frame of data; means for applying said frame of data through said encoding/decoding circuit to an elementary segment; means for operating said tester in a multicollision mode wherein said multicollision mode includes means for detecting a collision, means for causing the collision generating means to generate a transmission request signal in response to said transmission request, to generate a transmission signal in response to the detection of a transmission presence, and to generate jamming data that are then transmitted over said network in response to a collision detection, transmission ceasing at the end of the jamming data, said transmission request signal, transmission signal and jamming data constituting a sequence, means for operating said causing means a predetermined number (n) of times to generate n successive sequences, and means responsive to the generation of the nth sequence for terminating the generation of sequences; and means for generating a multicollision control signal, and wherein said causing means includes means responsive to a collision detection and to said multicollision mode signal for generating a control signal for to said collision generating means to cause it to generate said jamming data. - View Dependent Claims (17, 18)
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19. A tester for local networks having at least one elementary segment with a number of stations on the segment, each of said stations having a transmission and reception circuit and an encoding/decoding circuit, the tester comprising:
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a transmission and reception circuit; an encoding/decoding circuit, said transmission and reception circuit and said encoding/decoding circuit being substantially analogous to the comparable circuits in said stations; means for detecting the presence of a transmission from a station; means for generating a transmission request; a collision generating means, included at least in part in said transmission and reception circuit, said generating means being responsive to the detection of a transmission presence and the receipt of said transmission request for emitting a frame of data; means for operating said tester in a monocollision mode including means for causing said collision generating means to generate a transmission request signal in response to said transmission request and to generate a transmission signal in response to the detection of a transmission presence, and means for causing said encoding/decoding circuit to inhibit the transmission signal after a predetermined time; means for applying said frame of data through said encoding/decoding circuit to an elementary segment; means for generating a monocollision mode control signal and wherein said means for applying said frame includes a collision detector, said causing means includes means responsive to said collision detector and to said monocollision mode control signal for generating a signal causing said collision generating means to continue generating said transmission signal. - View Dependent Claims (20, 21)
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22. A method for operating a local network tester in a multicollision mode comprising the steps of:
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generating a transmission request; detecting the presence on the network of a transmission from a station on the network; detecting a collision; generating a predetermined number (n) of successive sequences being sent onto the network, each of which sequences includes a transmission request signal generated in response to a transmission request, a transmission signal generated in response to the detection of a transmission presence, and jamming data generated in response to a collision detection; and terminating the generating of sequences in response to the generation of the nth sequence.
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Specification