Technical Support--FAQ

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Introduction and general description
Q.	What is LAN ? What is WAN ?
A.	LAN is Local Area Network. It consists of a group of computers and the connecting devices - such as network adapters, hubs, switches and network cables. There is a network adapter in every computer. The network cables connect these computers to hubs or switches. So these computers can share files and information with each other. WAN is Wide Area Network. It connects computers in a wide area. It may connect LANs in different cities together. Internet is a WAN.
Q.	What are these LAN devices ?
A.	Network Adapter - It is a network card for computer. It may be an ISA bus card or PCI bus card. It may be for 10Mbps speed only or both 10/100Mbps speeds. Hub - Hub connects all the computers together by network cables. If an 8 ports hub, 8 computers can be connected together. If a 16 ports hub, 16 computers can be connected together. Hub can be connected to another hub or switch. (We call it "cascading" or "uplink"). Some hubs have the stacking function. They can extend the connecting capacity by stacking with another hub. Switch - Switch can connect network devices together with faster speed and better performance because of the switching architecture. The data in the network will be sent to "every connection" on the hub because most of the hubs work with repeater architecture. That will increase the unnecessary traffic and cause the speed down. But the switch only sends the data to the connection for the data. That will reduce the network collision and increase the network speed. So switch has big bandwidth that is several times of the repeater hub. Sometime, switch is also called a switching hub. Bridge - Bridge connects two LANs together and can filters/forwards data between them. Router - Router can connect LAN to WAN. There is a routing table in it so that it can send data to computers in WAN.

CeLAN Technology Inc.
No.12, Kuang Fu S.Rd., HsinChu Industrial Park, HsinChu Hsien, Taiwan, R.O.C.
TEL: 886-3-5979888 FAX: 886-3-5978765