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

Subscriber line interface method and circuit of program control exchange board

A user line interface, program-controlled switch technology, applied in the field of telephone communication, can solve the problems of inability to integrate, limited selection of manufacturers, and high prices, and achieve the effects of improving flexibility, reducing production costs, and working stably

Inactive Publication Date: 2005-08-03
HUAWEI TECH CO LTD
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0022] 1. Existing IC solutions need to use special high-voltage semiconductor technology to realize, the price is high, and the selection of manufacturers has great limitations
[0023] 2. The functions of CODEC chips realized by ordinary semiconductor technology are getting stronger and stronger, but because SLIC chips need to use special high-voltage technology, the two cannot be integrated together

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
  • Subscriber line interface method and circuit of program control exchange board
  • Subscriber line interface method and circuit of program control exchange board
  • Subscriber line interface method and circuit of program control exchange board

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0045] Below according to accompanying drawing and embodiment the present invention will be described in further detail:

[0046] according to figure 2 , image 3 , Figure 4 , Figure 5 with Image 6 , the present invention includes receive operational amplifiers such as Image 6 As shown, its positive terminal and negative terminal are respectively connected to resistors R1 and R3 and connected to TIP and RING through external DC blocking capacitors C1 and C2 respectively. The positive terminal of the receiving operational amplifier is connected to resistor R2 and connected to the internal reference voltage V ref , the negative terminal is connected to the output terminal through a resistor R4; a common mode control circuit CMCC samples TIP and RING respectively through two sampling resistors RT and RR, and the outer terminals of the two sampling resistors are connected to a large resistance RL. The output terminal of the control circuit CMCC is connected to a triode a...

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 method and circuit for a program control exchange individual line interface relating to telephone communication characterizes in separating outer high voltage signals and its low voltage signals by the internal and external circuit and devices of the chip, and applying surrounding DC blocking capacitance to separate external high voltage DC signals, and DC blocking capacitance couples with the internal circuit of the chip, the signal in the chip provides voltage feed back to the loop circuit by a triode amplified circuit, VRX signals output in a way of AC feed, base of PNP triode is connected to low voltage sucuring a driving response of the triode to weak signals.

Description

technical field [0001] The invention relates to telephone communication, in particular to a user line interface method and circuit of a program-controlled exchange. Background technique [0002] Since the feed voltage of the subscriber line exceeds 40V, the subscriber line interface circuit chip used to provide the feed function of the subscriber line is generally realized only by using a high-voltage process. Because the high-voltage process is a special process, not only the price is high, but also there are relatively few chip manufacturers that can provide services, which brings great restrictions on the design of subscriber line interface circuit chips. This patent proposes a scheme for separating high-voltage signals from low-voltage signals, so as to realize the purpose of implementing subscriber line interface circuit chips with ordinary semiconductor technology. [0003] The basic architecture of the user circuit is as figure 1 Shown: [0004] Each signal line is...

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): H04L12/02H04L29/10H04M3/00
Inventor 李波孙洪军
Owner HUAWEI TECH CO LTD