CN1344070A

CN1344070A - Method for combining data signals with RF signals and transmitting then over cable of cable TV

Info

Publication number: CN1344070A
Application number: CN 00124529
Authority: CN
Inventors: 王志颖; 王拾玖; 余阳谷
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-09-19
Filing date: 2000-09-19
Publication date: 2002-04-10

Abstract

A method for combining data signals and RF signals and transmitting them over the cable of cable TV features that the IP data signals transmitted over optical cable or the base-band data signals demodulated by cable modem are respectively locked in 0-50 MH2 and 50-750 MH2 of coaxial cable for cable TV, and after transmitted to user room, they are filtered for separating one from another and then sent to TV set and computer respectively.

Description

The method that data-signal and radiofrequency signal are synthesized and transmitted in cable of cable TV

This inventive method belongs to transfer of data broadband network technology field.

With similar prior art of this inventive method such as ISDN technology, twisted-pair feeder access technology, DSL technology, Gigabit Ethernet technology, 5 class line access technologies (list of references: Communications World, domestic standard book number CN11-4405,5 phases, 3G (Third Generation) Moblie and TD-SCDMA)

The purpose of using this method is to solve wideband data to insert the necessary difficulty that repeats cloth 5 class lines, but does not transform just access band data, services of the interior network layout of building.

User side access band Data Base band signal in cable TV broadband network, the netting twine that generally uses a computer (claiming 5 class lines again) causes and the wiring of the repetition 5 class lines of original cable of cable TV, and the network rebuilding is brought difficulty.

This method is that the IP data-signal of optical cable transmission or the base-band data signal after the cable modem demodulation are returned in the cable tv coax, be locked in the 0-50MHz frequency range, and in same coaxial cable, be sent in the user family simultaneously in the cable TV RF of 50-750MHz band transmissions radiofrequency signal.

The outstanding advantage of this method is to have realized not repeating cloth 5 class lines, do not change under the condition of network layout in the building, finish last kilometer access that effectively utilizes original catv line to make wideband data or multi-user's utility cable modulator-demodulator, improve network operation speed, and effectively reduce the cost of networking at user side.

The producible good effect of this method is to have solved the network repeated construction, repeats wiring, reduces network rebuilding difficulty, accelerates networking.

The best way that realizes this method is to establish a synthesizer (Reference numeral 9) at place, building entrance or basement (Reference numeral 5), TV signal (Reference numeral 14) is mixed (Reference numeral 19) through high pass filter (Reference numeral 17) and data-signal (Reference numeral 15) through balancer (Reference numeral 16) and low pass filter (Reference numeral 18), and be locked in 50-750MHz frequency range (Reference numeral 31) and 0-50MHz (Reference numeral 30) frequency range respectively, send into cable tv coax (Reference numeral 20) after the mixing (Reference numeral 19); Establish user's separator (Reference numeral 2) in terminal, mixed signal (Reference numeral 21) is extracted TV signal (Reference numeral 14,28) by high pass filter (Reference numeral 22), add that by low pass filter (Reference numeral 23) a separation balancer (Reference numeral 32) becomes the equilibrium criterion signal to extract data-signal (Reference numeral 29) the non-equilibrium data conversion of signals on the coaxial cable; Simultaneously make TV and the TD branch distributor (Reference numeral 3) of data composite signal are connected the user through cable tv coax separator (Reference numeral 2) by monolithic switch or monolithic hub, export cable TV signal and IP data-signal respectively, to realize multi-user's star or tree-like connection.Analogize by the accompanying drawing principle, the TD branch distributor can be made into 2 mouthfuls, and 3 mouthfuls, 4 mouthfuls are waited series of products.TD branch distributor (Reference numeral 3) generally is installed on the corridor cable TV main line, and it is indoor that user's separator (Reference numeral 2) generally is installed in the user.

Reference numeral 1 is a subscriber unit, mark 4 is coaxial cables, mark 5 is TV signal and data-signal synthesis device case, mark 6 is cable TV HFC backbones, mark 7 is wired TV amplifiers, mark 8 is branch distributors, mark 10 is 5 class lines, mark 11 is cable modems, mark 12 is 100 mbit ethernet switches, and mark 13 is next subscriber units of serial connection, and mark 26 is the interfaces that lead to next subscriber unit, mark 27 is the BR decay interfaces that lead to this unit users, and mark 33 is to lead to next user TV﹠amp; The single mixed signal of DATA, mark 34 is the TV﹠amp that lead to this subscriber unit; The DATA mixed signal.

Claims

Wideband data inserts generally must use 5 class line or computer network lines in the building or in the building, when using a cable modem to support a plurality of user, also must lay 5 class line or computer network lines, repeat waste and engineering difficulty with the existing wired television coaxial cable.The purpose of using this method is to solve wideband data to insert the necessary difficulty that repeats cloth 5 class lines, but does not transform just access band data, services of the interior network existing wired TV wiring of building.

This method is that the IP data-signal of optical cable transmission or the base-band data signal after the cable modem demodulation are returned in the cable tv coax, be locked in the 0-50MHz frequency range, and in same coaxial cable, be sent in the user family simultaneously in the cable TV RF of 50-750MHz band transmissions radiofrequency signal.In user family, with high and low pass filter data and TV signal are separated again, send into television set and computer respectively.Each user can enjoy 10,000,000 data transfer bandwidths and 500-700 million cable TV bandwidths.The TD branch distributor replaces original common branch distributor, makes all cable TV subscribers all can obtain multimedia services such as data that original cable of cable TV provides and cable TV under the 5 class line situations not repeating to lay.