Low-delay relay card

Abstract

The invention relates to the field of relay cards, and more particularly to a low-delay relay card. The relay card comprises: an ARM CPU, a DDR, a Nor Flash, a Nand Flash, a reset chip, a clock chip,an LED, 4 GPHYs, 4 LANs, and 4 MAGs; the GPHY is a single-port gigabit Combo GPHY; the Combo GPHY is connected with the ARM CPU, and a management interface between the Combo GPHY and the ARM CPU is an SMI; each two of four Combo GPHYs form a group, thus the four Combo GPHYs are divided into two groups, the two Combo GPHYs in each group are connected by a high-speed differential line FIBER; the SMI of the ARM CPU is configured as a Master for managing and configuring the four Combo GPHYs, and corresponding interfaces are four MDC / MDIOs; the addresses of the four Combo GPHYs are respectively 0*01 / 0*02 / 0*03 / 0*04, and the MAGs are in one-to-one correspondence connection with the Combo GPHYs through network port network differential signals MDIs in the Combo GPHYs; and the LANs are in one-to-one correspondence connection with the MAGs. The relay card provided by the invention can implement data forwarding between two groups of electrical ports to electrical ports, and the Ethernet messageforwarding delay in the groups can be as low as 0.5 us.

Description

technical field [0001] The invention relates to the field of relay cards, in particular to a low-latency relay card. Background technique [0002] In current Ethernet communication applications, a relay card is a device connected to an Ethernet link, and is used for bidirectional forwarding of physical layer signals between two network nodes in a local area network. It is the center of all nodes on the LAN. Its function is to amplify the signal, compensate for signal attenuation, and support long-distance communication. The repeater is the simplest network interconnection device. It mainly completes the functions of the physical layer. It is responsible for transmitting information bit by bit on the physical layer of the two nodes, and completing the functions of signal replication, adjustment and amplification, so as to extend the length of the network. . Due to the signal attenuation in the cable, the power of the Ethernet signal transmitted on the link will gradually at...

AI Technical Summary

Problems solved by technology

[0009] 1. Ordinary repeaters can only complete the conversion from optical port to electrical port or electrical port to optical port;

[0010] 2. The network transmission delay of ordinary repeaters is greater than 2us, which is not suitable for high real-time application scenarios;

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