CN201188611Y

CN201188611Y - ADSL extender base on ISDN

Info

Publication number: CN201188611Y
Application number: CNU2007200788956U
Authority: CN
Inventors: 吴泽军; 罗正华
Original assignee: CHENGDU WIDEAREA COMMUNICATION TECHNOLOGY Co Ltd
Current assignee: CHENGDU WIDEAREA COMMUNICATION TECHNOLOGY Co Ltd
Priority date: 2007-03-28
Filing date: 2007-03-28
Publication date: 2009-01-28
Anticipated expiration: 2017-03-28

Abstract

The utility model discloses an ADSL extender based on an ISDN system. Composite signals from ADSL signals and ISDN signals of a local side and a user side realize the isolation of the ADSL signals on an LC filter circuit 2 and the transparency of the ISDN signals. The ISDN signals are released at the other side by the LC filter circuit 2, the ADSL signals are isolated, and the uplink signals and the downlink signals of the ADSL signals are further separated by a composite circuit. After effective amplification and filter processing are carried out on the uplink ADSL signals and the downlink ADSL signals, the ADSL extender of the utility model, which is based on the ISDN system, extends the transmission distance of the ADSL signals, increases the access rate of the ADSL signals, and ensures that the ISDN signals are not influenced.

Description

ADSL stretcher based on ISDN

Technical field

The utility model relates to a kind of ADSL stretcher based on ISDN, and circuit design method, comprises " LC filter ", " interface transformer ", " hybrid circuit ", " descending amplification and band pass filter ", " up amplification and band pass filter ".

Background technology

The ADSL technology has huge advantage in broadband and aspect of performance, but exists transmission range far away more, the problem that signal rate is low more.Be limited, generally can only cover 3.5 kilometers user scope.For giving full play to the ADSL conversation, surfing the Net and neglect neither, quick, stable cheap again advantage presses for the practicable solution of a cover, the transmission range of extending ADSL, the coverage of expansion ADSL signal.

Summary of the invention

The present utility model purpose is to overcome the restricted technical problem of present ADSL technical transmission distance, a kind of transmission range that can extend the ADSL signal is provided, the ADSL stretcher of expansion ADSL Service coverage, this stretcher can guarantee the ISDN business again when extending the ADSL business.

A kind of ADSL stretcher based on ISDN is characterized in that, comprises interface transformer, hybrid circuit, up amplification and band pass filter, descending amplification and band pass filter;

Interface transformer one end is connected to local side, ADSL downstream signal from local side is coupled to hybrid circuit by interface transformer, output to through hybrid circuit that descending amplification and bandwidth-limited circuit amplify and filtering, output to hybrid circuit then, and output to interface transformer coupling by hybrid circuit and output to user side;

ADSL upward signal from user side is coupled to hybrid circuit by interface transformer, through hybrid circuit) output to that up amplification and low pass filter amplify and filtering, then, output to hybrid circuit, and output to interface transformer coupling by hybrid circuit and output to local side;

Between local side and user side, there is one for isdn signal all-pass mistake, the LC filter 2 that the ADSL signal is all ended.

Supplementary technology scheme of the present utility model is as follows:

In order to utilize the Remote Power Supply of ISDN, in the local side side one " LC filter 1 " arranged, be used to obtain the Remote Power Supply on the isdn line.Should " LC filter 1 " all show as high resistant for isdn signal and ADSL signal.

Descending amplification and band pass filter are connected to form successively by difference folding and unfolding 2, high-pass filtering 2, isolation amplification, low-pass filtering 2 and differential driving 2; Up amplification and band pass filter are connected to form successively by difference folding and unfolding 1, high-pass filtering 1, isolation amplification, low-pass filtering 1 and differential driving 1.

The purpose of this utility model is to realize like this, from the ADSL downstream signal of ADSL central office with from the mixed signal of the isdn signal of central office, isdn signal wherein can directly pass through " LC filter 2 ", connects thereby deliver to user side ISDN terminal direct and user side.ADSL is then effectively isolated, and downstream signal then passes through " interface transformer 1 ", " hybrid circuit 3 " and outputs to after " descending amplification and bandwidth-limited circuit " handle, and outputs to user side through " amplifier 4 ", " interface transformer 2 " coupling.By amplification and filtering, expand downstream rate or the transmission range of ADSL effectively with the ADSL downstream signal.

For the ADSL upward signal that comes free user side, then output to " up amplification and low-pass filter circuit " and handle, deliver to " hybrid circuit 3 ", " interface transformer 1 " coupling again and output to local side by " interface transformer 2 ", " hybrid circuit 4 ".By amplification and filtering, expand upstream rate or the transmission range of ADSL effectively with upward signal.

ADSL stretcher based on ISDN of the present utility model by the effective amplification to descending, up ADSL signal, reaches filtering, has improved the speed or the transmission range of ADSL signal, has expanded the Service coverage of ADSL signal.Simultaneously can also guarantee normal ISDN business.

Description of drawings

Fig. 1 is the theory diagram of the utility model based on the ADSL stretcher of ISDN;

Fig. 2 is the schematic block circuit diagram of the ADSL stretcher based on ISDN shown in Figure 1;

Fig. 3 is that the ADSL based on ISDN shown in Figure 2 uses block diagram;

Fig. 4 is that adding is of the present utility model based on the application block diagram behind the ADSL stretcher of ISDN.

Embodiment

Below in conjunction with the drawings and specific embodiments, the ADSL stretcher based on ISDN of the present utility model is described in further detail and describes.

Fig. 1 is the theory diagram of the utility model ADSL stretcher.ADSL downstream signal from local side passes through copper twisted pair cable CO1, CO2 is input to " interface transformer 1 ", and be coupled to " hybrid circuit 3 ", outputing to " descending amplification and bandwidth-limited circuit 6 " through " hybrid circuit 3 " amplifies and filtering, its concrete processing procedure is seen Fig. 2, ADSL downstream signal from " hybrid circuit 3 " is delivered to " difference folding and unfolding 2 " successively, " high-pass filtering ", " isolate and amplify ", " low-pass filtering 2 ", after " differential driving 2 ", deliver to " hybrid circuit 4 ", deliver to " interface transformer 2 " again, output to user side copper twisted pair cable CPE1 at last, CPE2.Equally, from user side CPE1, the ADSL upward signal of CPE2, be coupled to " hybrid circuit 4 " by " interface transformer 2 ", outputing to " up filtering and low-pass filter circuit 5 " through " hybrid circuit 4 " amplifies and Filtering Processing, its concrete processing procedure is seen Fig. 2, ADSL upward signal from " hybrid circuit 4 ", delivered to " difference folding and unfolding 1 " successively, " low-pass filtering 1 ", " differential driving 1 ", deliver to " hybrid circuit 3 " then, after " hybrid circuit 3 ", enter " interface transformer 1 ", output to local side copper twisted pair cable CO1 through " interface transformer 1 " coupling, CO2.

For compatible ISDN business service, one " LC filter 2 " arranged between local side and user side, for isdn signal all-pass mistake, the ADSL signal is all ended.In present embodiment, " LC filter 2 " is for being connected in a filter circuit between local side copper twisted pair cable CO1, CO2 and user side copper twisted pair cable CPE1, the CPE2 respectively.

, when using, directly be serially connected in the original copper twisted pairs based on the ADSL stretcher of ISDN.

Of the present utility modelly be not limited to the scope of embodiment based on the ADSL stretcher of ISDN, all innovation and creation that utilize the utility model design are all at the row of protection.

Claims

1. the ADSL stretcher based on ISDN is characterized in that, comprises interface transformer, hybrid circuit, up amplification and band pass filter, descending amplification and band pass filter;

Interface transformer (1) one end is connected to local side, ADSL downstream signal from local side is coupled to hybrid circuit (3) by interface transformer (1), output to through hybrid circuit (3) that descending amplification and bandwidth-limited circuit (6) amplify and filtering, output to hybrid circuit (4) then, and output to interface transformer (2) coupling by hybrid circuit (4) and output to user side;

ADSL upward signal from user side is coupled to hybrid circuit (4) by interface transformer (2), output to through hybrid circuit (4) that up amplification and low pass filter (5) amplify and filtering, then, output to hybrid circuit (2), and output to interface transformer (1) coupling by hybrid circuit (2) and output to local side;

Between local side and user side, there is one for isdn signal all-pass mistake, the LC filter 2 (9) that the ADSL signal is all ended.

2. the ADSL stretcher based on ISDN according to claim 1 is characterized in that, is connected with the LC filter 1 that all shows as high resistant for isdn signal and ADSL signal between the Remote Power Supply of interface transformer (1) and ISDN.

3. the ADSL stretcher based on ISDN according to claim 1 is characterized in that, described descending amplification and band pass filter (6) are connected to form successively by difference folding and unfolding 2, high-pass filtering 2, isolation amplification, low-pass filtering 2 and differential driving 2; Up amplification and band pass filter (5) are connected to form successively by difference folding and unfolding 1, high-pass filtering 1, isolation amplification, low-pass filtering 1 and differential driving 1.