7 results about "Link layer" patented technology

An integrated circuit device includes a scan driver block, a high-speed interface circuit block, and a scan driver pad arrangement region in which pads electrically connecting scan output lines of the scan driver block and scan lines are disposed. The high-speed interface circuit block includes a physical layer circuit that receives data using differential signals, and a link controller that performs a link layer process. The scan output lines of the scan driver block are provided from the scan driver block to the scan driver pad arrangement region to pass over the link controller while avoiding the physical layer circuit. A common voltage line connecting first and second common voltage pads is provided from the first common voltage pad to the second common voltage pad along a first direction, the common voltage line being provided in a second direction with respect to the physical layer circuit along the first direction in an arrangement region of the physical layer circuit.

The invention belongs to the technical field of DCS platform communication of a nuclear power plant, and specifically relates to a security-level DCS high-speed redundant bus communication method. The method comprises the following steps: (1) transmitting by use of two paths of different physical mediums; (2) transmitting by use of two paths of different link layers; (3) adopting two paths of different receiving processing modules; (4) starting sending according to two frame structures determined in the step (2) on two different redundant buses determined in the step (1) after a sending module receives sending enabling signal; (5) decoding received data by use of two receiving processing modules determined in the step (3) to accomplish a rear flag bit; (6) setting one of two receiving processing modules determined in the step (3) as the main processing module; and (7) waiting the setting of the other path of data flag bit in a system set time after the main processing module finds a path of bus set flag bit; if the set occurs, comparing the data; otherwise, warning the fault of the redundant bus path.

The invention provides a link layer control method capable of detecting conflicts. The method comprises the following steps: broadcasting a notification message to a transmission node by using a receiving node, and starting an RSVP (Resource Reservation Protocol) window including a plurality of time slices, wherein the notification message comprises two parameters, namely, n and m; if data packets to be forwarded exists in the transmission node, calculating a time slice sequence number according to the attached parameters n and m after receiving the notification message, and selecting corresponding time slices from the RSVP window; replying an acknowledgement frame to the receiving node; after the RSVP window ends, speculating the time slice sequence number of the received acknowledgement frame according to the receiving time of each acknowledgement frame by using the receiving node; broadcasting a poll frame to the transmission node by using the receiving node, and embedding the speculated time slice sequence number of the acknowledgement frame in the poll frame; transmitting the data packets in sequence in a polling way by using the transmission node. By adopting the link layer control method, transmission conflicts can be avoided effectively.

The invention discloses a switch loop detection method and device. The method comprises the steps: sending, by a port, a first link layer discovery protocol message with first switch equipment information to a network; receiving all data messages from the network through the port and forwarding the data messages to the central processing unit; screening out a second link layer discovery protocol message from all the data messages; copying the second link layer discovery protocol message by using an auxiliary mirroring function of the access control list so as to transmit the second link layerdiscovery protocol message to the baseboard management controller; analyzing, bythe baseboard management controller, the second link layer discovery protocol message to extract second switch equipmentinformation; and determining the switch to be connected to the loop in response to the first switch device information matching the second switch device information. According to the invention, the network bandwidth overhead can be reduced when the loop is detected, the traffic storm is avoided, and the burden of the CPU is reduced.

The invention relates to a distributed multi-branch VPN communication method and system, and a storage medium, and the method comprises the following steps: detecting the communication quality of each transit server, and calculating the link communication quality between different transit servers; responding to communication joining of the first terminal and the second terminal, searching a plurality of paths with the best communication quality between the first terminal and the second terminal according to the link communication quality between the different transit servers, and establishing a plurality of branches; and realizing the transmission mode of the plurality of branches as a VPN layer, and transmitting a link layer data packet on the VPN layer to realize communication between the first terminal and the second terminal. The multi-branch communication and the VPN layer are combined to ensure that a point-to-point communication link is not influenced by a single-point fault, ensure that the network redundancy bandwidth is fully utilized, and ensure that when a certain communication link section fails, redundancy switching can be performed without communication link breakage at all.

The invention discloses a data link layer communication method and device of a virtual network. The method comprises the following steps: receiving a first communication message from a first virtual network corresponding to a target user; determining the second virtual network corresponding to the target user according to the first virtual network, wherein the first virtual network and the second virtual network are heterogeneous networks; packaging the first communication message into a second communication message corresponding to the second virtual network; sending the second communication message to the second virtual network through data link layer communication; realizing the data link layer communication between the virtual networks through the network mapping table, wherein routing equipment is not needed; therefore, the technical problem of low communication efficiency caused by communication through a network layer in the prior art is avoided, and actual communication requirements can be better met.