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Research and Development of ID-02 Ethernet Extender

Author: DiZuo
Tutor: ZhaoHongWei
School: Jilin University
Course: Software Engineering
Keywords: Ethernet Extender USB Digital Signal Processor CPLD
CLC: TN915
Type: Master's thesis
Year: 2009
Downloads: 13
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Abstract

In general,Ethernet can transmit 100 meters,which limits its broader application. In order to break through its limitation,people use different technologies to extend the transmitting distance of Ethernet.Adopted long-reacher Ethernet driving technology, ethernet can transmit 300 meters to 700 meters long.Moreover,sometimes applications needs further distance,so this paper use protocol transition technology to solve this problem,this method transits Ethernet protocol to E1 protocol and use the existed telecom network to extend the transmitting distance.The network extender is a kind of network device which can extend the distance of the Ethernet,and it can be divided into local extender and remote extender according to the distance.This paper studies on remote Ethernet extender,it converts the format of Ethernet to the format of E1 to make Ethernet transmitted on telecom network.In this paper,I design ID-02 ethernet extender based on theory.ID-02 ethernet extender can use the spare bandwidth of telecom service providers,so it provides a solution for users to improve work efficiency and make decision-making cycle short as well as decrease cost for companies.ID-02 ethernet extender is developed by us for private network customers,its bandwidth can be configured flexibly from 64Kbps to 2048Kbps.During the first development phase of ID-02 ethernet extender,I consult many data about the current status of Ethernet extender,and its background.Afterwards,I make an alayse on the provision and requirement of Ethernet extender in detail,then I make a summary scheme including modules and technologies and functions of the system.In the project,I use Ti advanced digital signal processor TMS320VC5402 as controller,and Altera complex programmable logical device EPM7128SLC84 as logic and timing generater,and I use chip MT9075 to complete protocol transition. Connecting to personal computer,ID-02 ethernet extender supports flexible configuration by USB interface.So,I design usb interface by using Philips chip PDIUSB12.I use EEPROM PCF85116 which is an IIC-bus chip to save the data after power off.Besides,in order to keep DSP run faster,I design parallel bootlaod to transfer program from FLASH SST39VF400A to internal RAM of TMS320VC5402.During the course of developing ID-02 ethernet extender,I use SEED-XDS560 emulator which is a tool for DSP and its intergrated development environment CCS3.1. At the same time,Ⅰuse MAX+PLUSSⅡsoftware platform and correlative hardware circuit and VHDL program language to design system logic and timing.ID-02 ethernet extender can not only extend the transmission distance of Ethernet but also manage network,also it can monitor the working states of the equipments in the network and configure their working modes.Besides,through the configuration software platform,users can configurate the work mode,negotiation mode and so on, then transmits the parameters to the memory in the ID-02 ethernet externder using the USB interface.At the same time,the device supports MDI/MDI-Ⅹports,allows transmitting and receiving VLAN data packet,supports 15000 frames per second filtering and forwarding rate,and provides 1000 MAC address LAN table,and automatic LAN table learning and aging.In a word,ID-02 ethernet extender contains all the functions of the private products in the market.One of the key technologies of the system is logic and timing design,which is implemented by the programmable logic device EPM7128.It is a necessary factor for hardware circuit to work properly with accurate timing.Otherwise,chips can’t work or work abnormally,in the end the system will be out of work completely.So,It is absolutely necessarily to provide accurate timing.Moreover,It is a good way to use CPLD providing chip selection signal.Usually,there are two ways to design logic and timing of the system,one is the way of circuit diagram,and the other is the way of hardware design language such as Verilog and VHDL.This paper describes how to use hardware design way to design logic control of the system,and how to use VHDL language to design timing control of the system.By this way,it offers 20M dock for DSP controller TMS320VC5402, and 20M and 8K clocks for E1 interface chip MT9075.All these signals will keep the system work normally and stably.ID-02 ethernet extender is developed for our private network customers such as fire police and armed police.During the course of development,we do our best to make system run stably and we design the functions to be all-around and be characteristic according to the requirement of each customer. ID-02 ethernet externder comes to put into production after our one year’s work, it completely satisfies the requirements of pre-design.It runs stably and reliably during the course of tests by customers,and the users give high praise on it.Therefore, ID-02 ethernet extender will be sold widely because it has compact framework,and pefect functions and features,as well as reliable running performance.

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