CN201830339U

CN201830339U - Network transmission system

Info

Publication number: CN201830339U
Application number: CN2010205645081U
Authority: CN
Inventors: 吴小龙
Original assignee: TRONSON ELECTRONICS CO Ltd
Current assignee: TRONSON ELECTRONICS CO Ltd
Priority date: 2010-10-18
Filing date: 2010-10-18
Publication date: 2011-05-11
Anticipated expiration: 2020-10-18

Abstract

The utility model discloses a network transmission system comprising an ADSL (Asymmetric Digital Subscriber Line) system; the ADSL system comprises local side equipment and customer premise equipment; the local side equipment further comprises a local side ADSL Modem, a DSL (digital subscriber line) access multiplexer and a local side separator; the customer premise equipment further comprises a customer ADSL Modem and a customer POTS (Photo-Optical Terrain Simulator) separator; the local side equipment and the customer premise equipment are connected with each other by a data transmission line, so that the downlink rate is high, the frequency band is wide, the performance is excellent, and the installation is convenient; an ADSL based on the asymmetric transmission technology is especially suitable for a user to request music, videos and interactive games on demand and voluntarily control the operations according to own demand without being under control of a television station like wired television programs; and enterprise networks or local area networks at various places can be connected together, so that the trouble caused by scattered enterprises can be avoided, and simultaneously internet browsing of the user can not be influenced.

Description

A kind of network transmission system

Technical field

The utility model relates to computer network and data communication technology field, relates in particular to a kind of network transmission system.

Background technology

Modern society is increasing to the demand of information, and Internet becomes more and more important to information-intensive society.The increase of backbone network bandwidth and the increase of user's request make Access Network become the bottleneck of communication network, and telecom operators rack one's brains on promoting the network bandwidth and transmitting.The Access Network that is called as " last kilometer " has become the focus of communication industry development.

Transmit high-speed data in order to make full use of the copper cash that has laid, the copper wire access technology becomes optimal selection.Traditional PSTN dial-up access is called narrowband dialing again and inserts, and utilizes the transmission of plain old telephone Modem at the enterprising line data signal of the ordinary telephone line of PSTN.Have only 56kbit/s because its transmission rate is the highest, and conversation shortcoming such as can not carry out simultaneously with surfing the Net, make it can not satisfy the growing demand of user miscellaneous service.ADSL arises at the historic moment thus, and it has not only utilized traditional telephone line, and is greatly improved aspect speed, and then has obtained large-scale use.

But the ADSL access rate is low at present, and transmission range is short, and is in order to solve the growing demand to various high-rate services of user, imperative for the upgrading of ADSL.ADSL is directly upgraded to ADSL2+, and again towards VDSL2 (very high speediness rate Digital Subscriber Loop) technical development, through FTTC (Fiber To The Curb), FTTB (Fiber To The Building), finally the all-optical network towards FTTH develops.We can say that FTTH is the long-term goal of Access Network development, also is final goal.Also there is not at present the perfect network transmission system of a cover to realize that network data signals at a high speed transmits based on above-mentioned know-why.

The utility model content

The purpose of this utility model is to provide a kind of network transmission system, by asymmetric transmission, utilizes frequency multiplexing technique) uplink and downlink channel branch is come reduce the influence of cross-talk, thus the high speed that realizes signal transmits.

For effectively solving the problems of the technologies described above, the technical scheme that the utility model is taked is as follows:

A kind of network transmission system of realizing said method, it comprises an ADSL system, described ADSL system comprises local side apparatus and ustomer premises access equipment; Described local side apparatus also comprises local side ADSL Modem, DSL access multiplexer and local side separator; Described ustomer premises access equipment also comprises user ADSL Modem and user POTS separator; Described local side apparatus and ustomer premises access equipment interconnect by the transfer of data route.

Described local side separator and user POTS separator combine one 3 port devices by a bidirectional low-pass filter and a two-way high pass filter respectively.

Described local side ADSL Modem and user ADSL Modem also comprise a high speed data transmission interface, and described high speed data transmission interface transmission rate is supported 155Mbit/s, 100Mbit/s, 45Mbit/s and 10Mbit/s.

The beneficial effects of the utility model are: network transmission system downstream rate height, bandwidth, performance that the utility model provides are excellent, easy for installation; ADSL based on the asymmetry transmission technology is particularly suitable for the program request of user to music, video display and interactive entertainment, and the user can at random arbitrarily control above-mentioned business, and needn't be controlled by TV station as cable television program according to the needs of oneself; The enterprise network or the local area network (LAN) of different location can be coupled together, avoided enterprise to disperse the trouble of being brought, do not influence each user browsing simultaneously again the Internet.

Below in conjunction with accompanying drawing the utility model is elaborated.

Description of drawings

Fig. 1 is that network system described in the utility model is formed structural representation;

Fig. 2 is a network system ustomer premises access equipment annexation schematic diagram described in the utility model.

Embodiment

Referring to Fig. 1 and Fig. 2, a kind of network transmission system of realizing said method, it comprises an ADSL system, described ADSL system comprises local side apparatus and ustomer premises access equipment; Described local side apparatus also comprises local side ADSL Modem, DSL access multiplexer and local side separator; Described ustomer premises access equipment also comprises user ADSL Modem and user POTS separator; Described local side apparatus and ustomer premises access equipment interconnect by the transfer of data route.

Described network system operation principle of the present utility model is:

Adopt DMT (Discrete multi-tone) technology, with original telephone line 0Hz to the 1.1MHz frequency range sub-band that to be divided into 256 frequency ranges be 4.3kHz.Wherein, the following frequency range of 4kHz still is used to transmit POTS (Plain Old Telephone Service), and 20kHz is used for transmitting upward signal to the frequency range of 138kHz, and 138kHz is used for transmitting downstream signal to the frequency range of 1.1MHz.

The DMT technology can be adjusted at the bit number of being modulated on each channel according to the situation of circuit, so that utilize circuit more fully.In general, the signal to noise ratio of subchannel is big more, and the bit number of modulating on this channel is many more.If the signal to noise ratio of certain subchannel is very poor, then give it up.At present, the ADSL know-why can reach the data transmission rate of up 640kbps, descending 8Mbps.By on can see, for original telephone signal, still use original frequency band, and based on the business of ADSL know-why, use be frequency band beyond the speech.So original telephone service is not affected.

Another operation principle of the present utility model is:

ADSL utilizes frequency multiplexing technique (or Echo Cancellation technology) that uplink and downlink channel branch is come and reduces the influence of cross-talk by asymmetric transmission, thereby the high speed that realizes signal transmits.In order to utilize a plurality of channels, the bandwidth that ADSL modem adopts dual mode to divide utilizable telephone line: FDM technology (Frequency Division Multiplexing) or Echo Cancellation technology (Echo Cancellation) technology.The FDM mode is ascender and descender with frequency band division, and down going channel is being one or more IA High Speed Channel and low rate channel by time division multiplexing (Time DivisionMultiplexing); And data feedback channel also can be multiplexed with corresponding low rate channel.Echo Cancellation technology (Echo Cancellation) is cancelled out each other data feedback channel and the down going channel lap on frequency band, Echo Cancellation technology by this locality can be separated the uplink and downlink channel effectively, reduce the influence of cross-talk, thereby the high speed that realizes signal transmits to channel.

Data are divided into a plurality of sub-bearer channels, test each quality of channel, give its certain bit number then.DMT creates these channels with discrete fast Fourier transform.The mechanism that the DMT use is familiar with is created the connection between modulator-demodulator.When two DMT modulator-demodulators connected, they attempted possible flank speed.Noise and decay according to circuit, two modulator-demodulators may successfully connect with flank speed or progressively changing down up to both sides' Splitter of all being satisfied with the audio signal on the circuit is separated with the high-frequency digital modulation signal, then audio signal is sent into telephone set, the high-frequency digital modulation signal is sent into modulator-demodulator.

The utility model is not limited to above-mentioned execution mode, and every employing and the utility model analog structure realize that all execution modes of the utility model purpose are all within the utility model protection range.

Claims

1. a network transmission system is characterized in that, it comprises an ADSL system, and described ADSL system comprises local side apparatus and ustomer premises access equipment; Described local side apparatus also comprises local side ADSL Modem, DSL access multiplexer and local side separator; Described ustomer premises access equipment also comprises user ADSL Modem and user POTS separator; Described local side apparatus and ustomer premises access equipment interconnect by the transfer of data route.

2. network transmission system according to claim 1 is characterized in that, described local side separator and user POTS separator combine one 3 port devices by a bidirectional low-pass filter and a two-way high pass filter respectively.

3. network transmission system according to claim 1, it is characterized in that, described local side ADSL Modem and user ADSL Modem also comprise a high speed data transmission interface, and described high speed data transmission interface transmission rate is supported 155Mbit/s, 100Mbit/s, 45Mbit/s and 10Mbit/s.