Method and device for carrying out remote both way communications by using cable TV network

Abstract

The present invention relates to a method and device for two-way communication using a cable TV network, including a two-way data communication device and a network adapter, the network adapter is installed on a user terminal, and the two-way data communication device is installed on a distribution network node of a cable TV network, wherein Including two-way repeater, broadcast signal / data signal mixing / separating module and bandwidth detector, bandwidth detector automatically detects unused sub-bands in the available bandwidth of CATV cable distribution network, and uses them for two-way data communication. The invention solves the problem of signal attenuation in transmission, can be used for remote two-way communication, and can meet the requirements of practical broadband applications.

Description

technical field [0001] The invention belongs to the field of data communication, and more specifically relates to a method and device for long-distance two-way communication using the existing cable TV distribution network. Background technique [0002] In recent years, the demand for home data services has grown rapidly. The traditional wired telephone network has gradually failed to meet the needs of data communication. The cost of re-erecting a new cable network is too expensive. People have been looking for a more efficient and cheap solution. Program. The cable TV network is a hybrid network of optical fiber and cable. Its front section uses optical fiber, and the rear section uses cable. Great resource for data transfer. In order to use the cable TV network for data communication, people have thought of many ways, such as CMTS+Cable Modem system, which is a relatively mature two-way data communication system currently used in the United States. Its working principle...

AI Technical Summary

Problems solved by technology

Its working principle is to modulate the data signal on a specific channel and share the line with the broadcast stream of cable TV. It is adjacent to the broadcast signal, so its theoretically available bandwidth is "squeezed" from the TV channel. Yes, subject to more restrictions

And its uplink and downlink use different frequency bands, resulting in asymmetric transmission. For example, the commercial system currently used in the United States, the uplink and downlink rates can no longer meet the application of broadband data communication.

One of the characteristics of this system is that the central office equipment is placed at the head end of the optical fiber network, and bidirectional transformation is required on the line, and the cost of expansion is very high

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