摘要:
A method and apparatus for securing a network from access by unauthorized end stations. A port in a multiport repeater can be disabled automatically upon detection of an unknown source address in a data packet. In addition, an interrupt signal is provided to the indicate the detection of an intruder. Further, the disabling of the port can be done substantially immediately to interrupt the re-transmission of a single packet. Alternatively, the disabling of a port can be done programmably after a predetermined number of intruder packets have been detected, or after the verification of packet integrity.
摘要:
A method and system for providing statistical network information carried in a data packet being transmitted on a network. The method includes the steps of receiving a data packet having a data portion on a repeater and transferring the data portion to a management unit. The method further includes the step of appending statistical information to the data portion during an inter-packet gap period. The apparatus for providing statistical information in a data packet on a network includes a repeater mechanism, a management unit mechanism, and a packet tagging circuit. The repeater mechanism receives a data packet having a data portion, the management unit mechanism determines statistical information based on the data packet, and the packet tagging circuit appends information to the data portion of the data packet during an inter-packet gap period.
摘要:
A method and apparatus for efficiently transferring a data packet on a network. The efficient transfer of data includes compressing the data as the data packet is transmitted from a repeater to a management unit by determining if a destination address of a received packet matches a stored management unit address. When the stored address does not match the destination address, the data packet is compressed. The apparatus includes a repeater, a management unit, and a packet compression mechanism. The apparatus further includes comparator circuit means for determining address comparisons and count comparisons to control data compression.
摘要:
A method and system for providing statistical network information carried in a data packet being transmitted on a network. The method includes the steps of receiving a data packet having a data portion on a repeater and transferring the data portion to a management unit. The method further includes the step of appending statistical information to the data portion during an inter-packet gap period. The apparatus for increasing information in a data packet on a network includes a repeater mechanism, a management unit mechanism, and a packet tagging circuit. The repeater mechanism receives a data packet having a data portion, the management unit mechanism determines statistical information based on the data packet, and the packet tagging circuit appends information to the data portion of the data packet during an inter-packet gap period.
摘要:
A system is provided for use in a network to provide authentication of packets of data, provide security to ensure the prevention of unauthorized receipt of data, to provide improved monitoring of the packets of data transmitted and received over such a network, and to detect changes in the network topology. Repeaters utilized in the network are provided with the capability to detect and interpret packet data and the source address (SA) and destination address (DA) fields to provide the improved features.
摘要:
A method for providing a secure local area network includes the steps of receiving a data packet having a destination address and comparing the destination address to stored end station addresses. The data packet is disrupted on the repeater for the ports except the port with an associated stored end station address matching the destination address. Also, the disrupting of the data packet can be enabled on an individual port basis. A system includes a controller, a memory/comparator, and an inverse disrupt control mechanism. The inverse disrupt control mechanism produces a disrupt signal to disrupt the data packet on non-matching ports of the repeater when a match occurs within the repeater. The data packet is not disrupted on a port linking two repeaters when there is no match within the repeater. The inverse disrupt control can also be enabled or disabled on an individual port basis.
摘要:
A system is provided for use in a network to provide authentication of packets of data, provide security to ensure the prevention of unauthorized receipt of data, to provide improved monitoring of the packets of data transmitted and received over such a network, and to detect changes in the network topology. Repeaters utilized in the network are provided with the capability to detect and interpret packet data and the source address (SA) and destination address (DA) fields to provide the improved features.
摘要:
Systems, methods, and other embodiments associated with auto-negotiating over a single pair PHY are described. According to one embodiment, an apparatus includes a physical layer (PHY) transceiver configured to communicate over a single twisted pair channel. The apparatus includes a setup logic configured to control the PHY transceiver to initiate an auto-negotiation sequence over the single twisted pair channel with a remote device upon detecting a transmission from the remote device on the single twisted pair channel. The auto-negotiation sequence includes an exchange of parameters with the remote device using a half-duplex mode to communicate on the single twisted pair channel.
摘要:
A network device including a physical layer (PHY) device and an autonegotiation module. The PHY device is configured to interface with N cable pairs, where N is greater than 1. The PHY device includes a cable test module configured to diagnose a short circuit in one of the N cable pairs. The autonegotiation module is configured to i) selectively perform autonegotiation to establish a link with a link partner at one of a first link speed and a second link speed that is lower than the first link speed, and ii) select between the first link speed and the second link speed in response to the cable test module diagnosing the short circuit.
摘要:
A physical layer interface for a switch. The physical layer interface includes an auto-negotiation circuit, a transceiver, and a serial interface. The auto-negotiation circuit is configured to negotiate a first data transmission rate with a network client. The transceiver is configured to communicate with the network client at the data transmission rate. The serializer interface is configured to communicate with a media access controller (MAC) at a second data transmission rate that is different than the first data transmission rate.