Method and device fro carrying out bidirectional communication by using cable TV network
A cable television network and cable television technology, applied in the field of data communication, can solve the problems of high cost, inability to meet the application of broadband data communication, transmission asymmetry, etc., and achieve the effects of convenient capacity expansion, high cost performance and low price
Active Publication Date: 2007-02-21
上海云视科技股份有限公司
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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
Method used
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[0032]See Figure 1. The two-way data communication device 3 of the present invention is installed on the distribution network node of the cable TV network, and it is connected with the cable TV network 1 on the one hand, and is connected with the service supply network 2 on the other hand, and the service supply network 2 is controlled by the network management server 21 , SNTP server 22, FTP server 23, Vod server 24, Web server 25, email server 26, AAA server 27, etc.; after the signal of the cable TV network and the data signal of the service supply network are mixed at the two-way data communication equipment, they are passed through the cable The TV distribution network is sent to the user's home, and the network adapter 4 installed in the user's home separates the mixed signal into a broadcast signal and a data signal, and the broadcast signal is sent to the TV set 5, or sent to the TV set 5 through a set-top box 51, and the data signal is sent to the computer 6.
[0033...
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The apparatus comprises a bi-directional data communication unit and a network adapter. The network adapter is installed in the user terminal, and the bi-directional data communication unit is mounted on the distribution network node in the cable TV network. Wherein there a mixing / splitting module of broadcast signals / digital signals and a bandwidth detector; the bandwidth detector can automatically detects the unused bandwidth in available bandwidth in the cable TV network.
Description
technical field [0001] The invention belongs to the field of data communication, and more specifically relates to a method and device for two-way communication by 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. plan. 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 is to modulat...
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IPC IPC(8): H04L29/00
Inventor 孟军李克民黄海明
Owner 上海云视科技股份有限公司