8kbps sub-time slot interchange method and device thereof

A technology of switching equipment and time slot switching, applied in data switching networks, digital transmission systems, electrical components, etc., can solve the problems of occupying switching bandwidth, low switching bandwidth utilization, and huge switching centers, achieving cost savings and utilization. Improve, exchange flexible effects

Active Publication Date: 2010-06-30
HARBIN HYTERA TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

from figure 1 We can see that the voice data with a rate of 13kbit/s occupies 64kbit/s switching bandwidth, and the switching

Method used

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  • 8kbps sub-time slot interchange method and device thereof
  • 8kbps sub-time slot interchange method and device thereof
  • 8kbps sub-time slot interchange method and device thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Embodiment 1: An 8kbps sub-time slot exchange device of the present invention is composed of a programmable logic device unit, a microprocessor unit, an E1 interface unit, and a power supply unit. The programmable logic device unit is connected to the microprocessor unit and E1 interface unit, the microprocessor unit is connected to the E1 interface unit, and the power supply unit is respectively connected to the programmable logic device unit, the microprocessor unit and the E1 interface unit. An 8kbps sub-time slot exchange method of the present invention adopts sequential write control and read-out mode to realize n*8kbps variable rate time slot exchange, uses a microprocessor to implement IP packet encapsulation on data, realizes packet exchange of data, and uses ring The buffer realizes the voice and data buffering from the microprocessor to the programmable device, offsets the transmission jitter on the network, and realizes low-rate voice time slot exchange and dat...

Embodiment 2

[0019] Embodiment 2: An 8kbps sub-time slot exchange method and device of the present invention solves the problems of inflexible use of traditional time slot exchange chips and low exchange bandwidth utilization during the process of gradual reduction of the voice coding rate. The programmable device is based on the traditional time slot exchange T wiring principle, and the time slot exchange is realized by sequential write and read control. At the same time, the present invention improves the original time slot exchange, flexibly controls the time slot exchange rate, and improves The bandwidth utilization rate of the low-rate time slot exchange is improved, and the invention uses the microprocessor to realize the IP processing of voice data, and can realize the IP packet exchange of voice. The present invention realizes 480 channels of 8kbit / s voice time slot exchange with 4E1 interface and 30 channels of voice or packet exchange of data at the same rate in the TETRA networkin...

Embodiment 3

[0020] Embodiment 3: An 8kbps sub-time slot exchange method and device of the present invention, the software structure of the programmable device is as image 3 Shown. In order to complete the variable-rate voice exchange and data buffer function, the programmable device's software module is mainly divided into the following parts:

[0021] 1. E1 interface module

[0022] This module completes the clock signal and synchronization signal output of the E1 interface chip, completes the sampling of the input serial data and completes the output of the serial data according to the timing of the E1 interface chip. First, the bit count is performed according to the internal 2MHz clock and the basic frame synchronization signal is generated, and then the basic frame count is generated according to the multi-frame synchronization signal output by the E1 interface chip. In order to ensure the correctness of the sampled data, sampling must be performed at the middle position of the input dat...

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PUM

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Abstract

The invention provides a 8kbps sub-time slot interchange method and a device thereof, which is flexible to interchange, changes the minimum exchange rate of a chip through parameter configuration, and has more advantage compared with the traditional switch chip. The device comprises a programmable logic device unit, a microprocessor unit, an E1 interface unit and a power supply unit, wherein the programmable logic device unit is respectively connected with the microprocessor unit and the E1 interface unit. The 8kbps sub-time slot interchange method adopts a mode that the alphabetic writing controls reading to realize n*8kbps variable rate time slot interchange, and utilizes the microprocessor to perform IP group packet to data so as to realize packet interchange of data. The invention changes the minimum exchange rate of the chip through parameter configuration, has more advantage compared with the traditional switch chip, can realize the IP group processing function of the interchange of voice and data between systems, gives full play to the advantage of time slot interchange and IP group interchange in the interchange of voice and data, and saves the cost.

Description

(1) Technical field [0001] The invention relates to digital communication technology, in particular to an 8kbps sub-time slot exchange method and equipment. (2) Background technology [0002] Speech coding technology is usually divided into three categories: waveform coding, parametric coding and hybrid coding. Waveform coding directly samples and quantizes the analog voice, and expresses it by code. Its typical representative is PCM coding. The main process of PCM encoding is to sample the analog signal at regular intervals to discretize it, and at the same time round the sampled value according to the stratified unit, and at the same time use a set of binary codes to represent the amplitude of the sampled pulse , To realize voice digitization. The sampling frequency of voice PCM is 8kHz, and each quantized sample value corresponds to an 8-bit binary code, so the rate of voice digital coding signal is 8bit×8kHz=64kb / s. [0003] Parametric coding is also called sound source codi...

Claims

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Application Information

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IPC IPC(8): H04L12/24H04L12/26H04L12/56H04L29/06H04L12/931
Inventor 张成文王彬魏海涛梁守龙王丹孙德庆
Owner HARBIN HYTERA TECH CORP
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