The Implement Of Modern District Broadband Transfer System

This article tells us the designation of VLAN and management switchers for modern district broadband transfer system.Our modem district is developing quickly, and the level of information is a main standard to evaluate the living environment. Broadband district needs high internal transfer ability besides high broadband export. Because the district is becoming larger and larger, more and more information is transferred inside one building or a district, such as VOD and Internet games. It is impossible to send all these information to the main net. On the one hand, lots of the information is internal, so it is best to transfer them in the local area net. On the other hand the cost of updating the main net will be so large and its updating time is so long that the main net can't supply enough broad band and will come to paralyze. So we should divide the information into two parts, one for external and the other for internal. We should transfer different information by different manners, and we need special transfer devices for the modern district. There are few transfer devices designed by ourselves in our country, most of which are OEM products. There are few kinds of transfer devices and the price is so high. Above all, their operations are not suitable to us. So it is necessary to develop our own transfer device.This article introduces the request and the questions of the broadband district. It puts forward a new project to resolve these problems. Two kinds of switchers are designed for this project, one is VLAN switcher and the other is management switcher. VLAN switcher is at the bottom of the management frame. Because of the application of the SST89C58 MCU with large amount of FLASH, its cost is cut down and the operation is so simple that the switcher can be configured online. The management switcher is top grade device, which is located on the top of the frame. It adopts ARM? CPU, SNMP protocol and eCos operation system. It can be managed by PC through Internet.The two Ethernet switchers cooperate in the new project very well. This is an advanced transfer frame in our country, and it is suitable to the development of our broadband district. Now this project and the two switchers have been applied in several modern districts and received good comments.