Head end equipment of wired access network system

Abstract

An access network termination system which realizes the two-way communication in the cable television network, includes a switching router which combines or separates the digital and television signals, a plurality of access units which are used to process the digital signal to realize the bidirectional data signal switching and the transmitting signal processing module, a modulation-demodulation module and a power amplifying module, the strength of the descending signal output by the power amplifier is larger than the strength of the ascending signal output by the customer end, and the modulation-demodulation module adopts different modulation methods for the descending signal and ascending signal, wherein a plurality of access units adopt the time division technique to do data transmission, each access unit uses an independent time slot and the data transmission of the access units with an adjacent physical position is synchronous. The technical scheme with the termination system of the invention supports the communication between the ascending link and descending link with the different transmission rates, and the reception sensitivity and transmission quality is increased by the synchronous time-division communication.

Description

technical field [0001] The invention relates to the technical field of wired access network for realizing two-way data communication, in particular to a head-end device applied in a wired access network system. technical background [0002] CATV is historically a one-way medium, designed to provide broadcast analog video channels to the largest number of users at the lowest possible cost. In recent years, the high potential that wired broadband technology can provide in two-way data transmission has been fully recognized, and many wired network technologies have been developed and applied. Among the well-known technologies are: the DOCSIS 1.1 standard that has been promoted and developed in North America, which adopts the mode of direct purchase of the selected cable modem by the user, and the CMTS (Cable modem termination system) equipment used in the front end. At the same time, in the development of home network technology, the wired home network using the coaxial cable ...

AI Technical Summary

Problems solved by technology

[0005] 1. In the multi-channel system architecture, due to the coexistence of multiple access units, which communicate on different channels at the same time, the signal interference between channels affects the speed and signal sensitivity of data transmission, resulting in data packet Loss and backhaul increase, which in turn affects transmission efficiency;

[0006] 2. In the above-mentioned system architecture using multiple channels, when one of the access units sends data to the remote client, and at the same time, when another access unit is receiving data from the remote client, the weak The uplink data signal may be submerged in the surrounding noise and cannot be identified;

[0007] 3. In the traditional wired access network, when a large number of clients use the same channel, the load used for coordination management is high, which reduces the overall transmission rate / data throughput

Images