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US 5,329,519 AGranted
Lan monitoring method and apparatus
AssigneeHewlett-Packard Company
InventorColin S. I'Anson
Life of this patent
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Abstract
A monitoring device detects late packet collision on a CSMA/CD LAN. The device comprises a first detector for detecting the presence of a packet in the LAN, a second detector for detecting the occurrence of a packet collision in the LAN and a late collision indicator which provides a late collision indication whenever the second detector detects the occurrence of a collision more than a predetermined time after the first detector detects the presence of a packet.
Claims8
Apparatus for monitoring a CSMA/CD LAN, said apparatus comprising:
- input means for providing a connection to said LAN to enable monitoring of the LAN whilst operational;
- first detection means coupled to said input means and operative to detect the presence of a packet on the LAN and to generate a first output signal in response thereto;
- second detection means coupled to said input means and operative to detect a packet collision on the LAN and to generate a second output signal in response thereto;
- and
- late-collision indicator means connected to receive said first and second output signals and operative to provide a late-collision output indication when said second output signal indicates the occurrence of a packet collision subsequent to the elapse of a predetermined time interval from the start of the last preceding packet as indicated by said first output signal.
2 more elements
A method of monitoring a CSMA/CD LAN, the method comprising the steps of:
- detecting the presence of a packet on the LAN and providing a first output signal in response thereto;
- detecting a packet collision on the LAN and providing a second output signal in response thereto;
- and
- providing a late-collision output indication when said second output signal indicates the occurrence of a packet collision subsequent to the elapse of a predetermined time interval from the start of the last preceding packet as indicated by said first output signal.
1 more element
Dependencies are inferred from the claim text.