A LOW COST SIMULTANEOUS VOICE AND DATA COMMUNICATIONS LINK FOR LOCAL AREA NETWORKS ON A 4 WIRE SYSTEM

1994 ◽  
Vol 04 (02) ◽  
pp. 161-172
Author(s):  
DAVID A. BROWN ◽  
MAHER E. RIZKALLA
Keyword(s):  
System Design ◽  
Local Area Network ◽  
Effective Means ◽  
Technical Problem ◽  
Local Area ◽  
Data Rate ◽  
Full Duplex ◽  
Data Communications ◽  
Area Network ◽  
Worst Case

This paper provides details concerning the design of an integrated voice and data communications link for a Local Area Network that must utilize residential type 2 pair telephone wiring as its transmission medium. The communications link can provide a worst case total data rate of 80 K bps (full duplex), 80 K analog samples of audio signals total (full duplex), as well as power and ground for remote terminals. In a system design that utilizes the communications link discussed here, the above total values of data and audio information flow can be divided by the number of terminals anticipated in the system in any ratio desired. The intent of the design of the communications link is to provide what is believed to be the most cost effective means of implementing an intelligent network of consumer based products in a residential or small business type of environment. In this document, the original technical problem is discussed along with details concerning the development of the solution presented here. The system design example that is presented is only provided as an aid to understanding how the communications link can be applied and is not the focus of the central concept. In that example, the system is comprised of 8 remote terminals and one central control terminal — all of which are voice and data devices. Therefore, the available continuous data rate per terminal is 10 K bps with 5 Khz full duplex audio.

scholarly journals Digital FM Transceiver Design and Construction using Microcontroller and I2C Interfacing Techniques

2020 ◽  
Vol 8 (5) ◽  
pp. 4525-4532
Keyword(s):  
Integrated Circuit ◽  
Local Area Network ◽  
Low Cost ◽  
Audio Signal ◽  
Digital Signal ◽  
Local Area ◽  
Full Duplex ◽  
Radio Receiver ◽  
Area Network ◽  
Radio Communication

Communication is very much important for every community and radio communication is one of the easiest and simple media to provide information. The project represents the full duplex communication mode of FM transceiver (Radio + Transmitter). This paper describes on how to build a short-range FM transmitter using microcontroller. The paper also describes on how to build a FM radio receiver using micro-controller. Through the FM transmitter we can transmit our voice and any audio signal while through the radio receiver listener can listen any FM broadcasting channel. This project is based on KTMicro IC KT0803K monolithic digital stereo FM transmitter and Phillips TEA5767 radio receiver module. The quality of transmission and radio reception can be improved by Digital Signal Processing and Intelligent Tuning System. The heart of this project is Arduino UNO micro-controller which controls slave devices by Inter-Integrated Circuit (I2C) communication. The transmitter and the receiver both supports digital tuning and Phase Locked Loop (PLL) concept is used for recovery of the signals. The transmitter of this digital FM transceiver can be used for making announcements in schools, colleges, industries, hospitals, and other places using a condenser mic amplifier circuit and share music with the FM listeners using audio input port of the FM transmitter module. The radio receiver of this transceiver is used for listening any local FM broadcasting channel. It can be also used in specialized application such as local area network. For the construction of the transceiver it requires some small and low cost external equipment’s.

scholarly journals Adaptive System to Improve Decision Making for Protecting Data Conveyed over WLAN

2019 ◽  
Vol 9 (1) ◽  
pp. 6075-6086
Keyword(s):  
Data Protection ◽  
Wireless Local Area Network ◽  
Local Area Network ◽  
New Technology ◽  
Local Area ◽  
Data Communications ◽  
Area Network ◽  
Potential Risks ◽  
Analysis System ◽  
Data Analysis System

In the past two decades, the rapid growth of demand for wireless data communications has become evident due to the unreliability of wired data communications, which has become inadequate due to high costs and management monitoring of its security problems. Furthermore, such data may be intercepted when transmitted via wire connections with a negative attack and its contents changed with illegal modification. Therefore, due to these circumstances, there is an urgent need to protect data and achieve a wireless local area network (WLAN) for transmission. Data protection is therefore required through the design and implementation of a rigid algorithm that reduces the risk of hacking into wireless networks and prevents hackers from finding inevitable vulnerabilities in the data protection system. This research paper introduces a new technology to protect data from potential risks and provides a new “type” of encryption algorithms that minimizes these risks. This technology relies on the adoption of renewable rules proposed as production bases based on ambiguous logic to accomplish the construction of an intelligent data analysis system and move forward with appropriate protection decisions. The targeted packets for the local area network were captured and analyzed using open source software "WIRESHARK". Unsupervised learning classifier was used to monitor the network and detect the malicious intruders. The flow data have been collected and features are extracted and analyzed to examine the transmitted packets which were classified and ranked to have a specific cluster. Minimizing and comprising risk taking in consideration the imprecise data which was achieved via fuzzy rules. The results were discussed and concluded that potential risks could be minimized by the production rules that control the proposed data for the transferred encryption system. MATLAB 2014 toolkit based on a laptop with an Intel I3 processor and 4GB RAM was used.

Design and Experiment of Underwater Monitoring System for Fish Domestication Equipment

2013 ◽  
Vol 419 ◽  
pp. 477-482
Author(s):  
Lei Zhang ◽  
Qing Song Hu ◽  
Shi Long Zhang ◽  
Shou Yu Zhang ◽  
Chun Xiang Bai
Keyword(s):  
Feedback Control ◽  
Monitoring System ◽  
Local Area Network ◽  
Effective Means ◽  
Local Area ◽  
Area Network ◽  
Communication Mode ◽  
Camera System ◽  
Sparus Macrocephalus ◽  
Underwater Camera

The design of underwater monitoring system is an important component of fish domestication equipment for ocean ranching. In order to achieve the fish domestication effect so that to conduct feedback control of fish domestication device, this paper designs a wireless underwater camera monitoring system. The system includes local area network and GPRS network communication mode. The results of the underwater sealing experiment and the preliminary underwater camera test show the feasibility of the monitoring system. The effect monitored in Sparus macrocephalus domestication experiment in Xiangshan ocean area suggests that this camera system can not only meet the working requirements, but also be stable and reliable, which provides an effective means of monitoring for fish domestication on ocean ranching.

Strathnet—a local area network

1981 ◽  
Vol 1 (1) ◽  
pp. 21 ◽  
Author(s):  
David Hutchison ◽  
Doug Shepherd
Keyword(s):  
Local Area Network ◽  
Local Area ◽  
Area Network
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