Method and apparatus for adapting Ethernet signal transmission

Abstract

The invention relates to an adaptation method for Ethernet signal transmission. The method comprises a signal amplitude amplifying step when the signal is transmitted between a coaxial-cable network and a twisted-pair Ethernet physical layer chip. The invention has the advantages that the adaptation method can farthest utilize the twisted-pair Ethernet physical layer chip to realize the transmission in the existing CATV coaxial network and realize the transmission suitable for the coaxial network fading characteristic in the existing CATV coaxial network.

Description

technical field [0001] The invention relates to an adaptation method and device for Ethernet signal transmission, in particular to an adaptation method and device for twisted pair Ethernet physical layer chip and coaxial cable Ethernet signal transmission. Background technique [0002] Convergence is the development trend of today's information and communication industry. Due to technical, historical reasons and business characteristics, in the world, the telecommunication network represented by the telephone network and the CATV network (Community Access Television or Cable Television, cable TV network) are divided according to the three major businesses of telecommunications, broadcasting and Internet The radio and television network represented by the Internet and the computer network represented by the Internet are independently designed, constructed and operated separately. Separate network construction, high construction costs, high operation and maintenance costs, is...

AI Technical Summary

Problems solved by technology

[0037] Third, compared with twisted-pair cables that transmit differential signals, coaxial cable systems can only transmit single-ended signals;

[0040] First, most of the existing network equipment uses twisted-pair Ethernet physical layer chips. If the existing equipment is replaced in order to transmit Ethernet network signals on the existing CATV coaxial network, the cost will be too high and the cycle will be too long. And lose the flexibility of equipment application;

[0041] Second, the existing twisted-pair Ethernet physical layer chip is designed for the transmission characteristics of twisted-pair-based Ethernet. The pre-emphasis at the sending end and the equalization technology at the receiving end are not suitable for the transmission characteristics of the CATV coaxial network.

Therefore, these two MAC methods need the same ability to pass through the attenuation coaxial network, and the signal amplitude at the receiving end is basically the same; while the CSMA / CD MAC method requires the intercommunication between the various nodes of the coaxial network, and in the case of the coaxial network , according to the existing transmission technology and devices, the intercommunication between each node needs to overcome the attenuation between 25dB and 60dB, and the dynamic range of the received signal is very large;

[0042] Third, the existing twisted-pair Ethernet physical layer chip can only transmit and receive differential signals, but cannot transmit and receive single-ended signals, but the coaxial network can only transmit single-ended signals, not differential signals, and Some twisted-pair wires send and transmit on different lines, while coaxial networks must send and transmit on the same line

[0043] In summary, the main problem of the prior art is that the twisted-pair Ethernet physical layer chip cannot directly receive the Ethernet transmitted by the coaxial cable system due to the different obstacles of the twisted-pair Ethernet chip and the transmission characteristics of the coaxial CATV network. Signal

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