Filtering circuit for very high bit-rate digital subscriber line

Abstract

The present invention discloses a sort of wave filter circuit used for the very high bit-rate digital subscriber loop, used to fulfill the filtering, frequency mixing and severing of the upgoing signal and the downward signal of very high bite-rate digital subscriber loop VDSL, which includes: a transmitting wave filter circuit unit, a receiving wave filter circuit unit, a line wave filter circuit unit, a mixer circuit unit; the mixer circuit unit is respectively connected to the transmitting wave filter circuit unit, the receiving wave filter circuit unit and the line wave filter circuit unit, the sequence of the downward signal passes through the transmitting wave filter circuit unit, the mixer circuit unit and the line wave filter circuit unit; the sequence of the upgoing signal passes through the line wave filter circuit unit, the mixer circuit unit and the receiving wave filter circuit unit. Using this filter circuit the layout density of the VDSL equipment can be enhanced, the required expense of the replaced device in facility maintenance can be reduced, the circuit can well satisfy the requirement of matching the various characteristic impedance by replacing the build-out resistor.

Description

technical field [0001] The invention relates to the field of very high-speed digital subscriber line (VDSL: Veryhigh-speed Digital Subscriber Line) in the field of communication, in particular to a practical filter circuit for high-density VDSL design. Background technique [0002] Since the 1990s, in order to meet the needs of broadband services, telephone companies have developed a variety of digital subscriber line (DSL: Digital Subscriber Line) technologies, such as: asymmetric digital subscriber line (ADSL: Asymmetric Digital Subscriber Line) and VDSL Wait. These technologies are still developing constantly, especially ADSL and VDSL technologies are the most concerned. [0003] VDSL is an ultra-high-speed DSL technology for shorter distances, which can transmit data at a higher speed than ADSL on short twisted-pair copper wires. VDSL provides a downstream rate of 13Mbit / s to 52Mbit / s and an upstream rate of 1.5Mbit / s to 26Mbit / s. [0004] VDSL technology uses frequen...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a filter circuit of a very high bit rate digital subscriber line, which solves the problem of large volume, heavy weight, high maintenance cost and poor interchangeability of the filter circuit module used in the development of VDSL equipment in the prior art. Severe crosstalk between uplink and downlink signals, large insertion loss, etc.

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