Unlock instant, AI-driven research and patent intelligence for your innovation.

Modem for communication through power line carrier system

A technology of modem and power carrier, applied in multiplex communication, frequency modulation carrier system, distribution line transmission system, etc., can solve the problem of unrealistic distribution line

Inactive Publication Date: 2012-03-21
SUMITOMO ELECTRIC IND LTD
View PDF1 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] To fundamentally solve this problem, it is required to standardize the characteristic impedance of distribution lines, but this requirement is unrealistic for existing distribution lines from the viewpoint of cost and other aspects

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Modem for communication through power line carrier system
  • Modem for communication through power line carrier system
  • Modem for communication through power line carrier system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0020] An embodiment of the present invention will be described in detail below in conjunction with related drawings.

[0021] figure 1 It is a schematic diagram of the power line carrier system. A plurality of terminal modems 1a, 1b, 1c, etc. are connected to the secondary-side power distribution line 13 of the pole-mounted transformer 12 . The primary distribution line 11 of the pole-mounted transformer 12 is generally a three-phase system, while the secondary-side distribution line 13 of the pole-mounted transformer 12 is generally a single-phase three-wire system. To simplify, figure 1 These distribution lines are represented as single lines in .

[0022] A main station, which is usually connected to a higher-level network such as the Internet, is connected to a power distribution line 13 through an optical fiber 14 , an optical-to-electrical (O / E) converter 15 , and a main modem 16 . When a communication circuit is formed by connecting the master modem 16 between one ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A modem for a power line carrier system performing communication through a power distribution line network. A modem for time division multiplex communication adjusts in a time slot allocated for the communication the input-output impedance to a matched low-impedance value and adjusts in the other time slots not allocated to the modem the input-output impedance to a high-impedance value. Another modem for both time division multiplex communication and frequency division multiplex communication adjusts in a time slot allocated for the communication the input-output frequency to enable an allocated frequency to pass through the modem. These measures can secure good communication without adversely affecting the communication through the other modems connected to the power distribution line network, without regard to the number of terminals connected.

Description

technical field [0001] The present invention relates to a modem for use in communication via a power line carrier system for communication on a power line network such as a distribution line network. Background technique [0002] As we all know, the power line carrier system transmits data through the power line. A power line carrier system includes a network of distribution lines called a distribution grid connected to transformers on poles; and several terminals connected to the distribution grid. Each terminal is configured for each building. [0003] The input-output impedance of the terminal modem connected to the terminal of the distribution line preferably matches the characteristic impedance of the distribution line. However, the common distribution line network is usually not designed for data transmission, so the characteristic impedance of each distribution line is usually different. [0004] When connected to such distribution lines, the impedance of the termi...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H04B3/56H04L27/10H04J3/00H04B3/54
CPCH04B2203/5425H04B3/542H04B3/54
Inventor 前畠贵
Owner SUMITOMO ELECTRIC IND LTD