Study on a kind of communication tools. Possible classification of communication tools. 1. the hub or PC actually (Hub, Repeater) is a device that is contrary to, and expands the signal to send to the other device, a long distance away. There are no changes to the data before and after. The transfer and use of any software is not related to this type of device, it's easy to install. 2. switch or bridge (Switch, Bridge) is a device for the connection. A local area network Or local area network (LAN). Use one protocol. The two circles together, such as using the connection. Ethernet LAN (Ethernet LAN) or token ring LAN (LAN Token Ring) this switch or bridge would have connected the hardware and check for transmission errors. The data transmission speed was not reduced and easy installation. 3. features of the device (Router), it works like switches, but is unable to connect to the system using the media or different types of cable connections, such as Ethernet LAN (Ethernet LAN) that sends data u TP (Twisted Pair UTP: Unshield) to another network, but the Dutch Internet e-mail using a code active Asia (Coaxial cable) is also helping to select or customize the paths that will send the data and convert data to suit the. Of course, that surely more difficult installation. 4. the gateway (Gateway) is a device that is capable of a maximum. To connect different networks together, without the limits between different systems or even network protocols will vary. Gateway To convert the protocols to suit the different types of devices. The equipment is expensive and difficult installation tasks. Some gateways are included as a feature in the erotic with or even may include functions to work security at the firewall (Firewall) is called. 5. modem (Modem) MODEM from Modulator-DEModulator full that converts digital data signal received from the transmitter, the signal is analog or copy before sending to the next destination. Through the phone, and when sent to a network destination, the modem converts the signal into a digital copy from NA. To apply to the destination computer. 6. multi-plex (Multiplexer) how to connect to the communication between the sender and the recipient to the destination, the easiest is to connect the dot (Point to Point), but free of charge, and that there is no active connection to the more difficult is the number of connections that use 802.3 wired communication just. 7. Hotel ratoe EVD (Concentrator) icon, Zen hotel is a multi-plex ratoe services with high efficiency. Unable to add a line or transmission channel. The data will be sent.Asynchronously 8. front-– n FEP FEP (Front-End Processor), processor is a computer that uses a connection between a computer and the host computer or network equipment for mini-data communication, such as a modem, multi select services, etc, there is one at FEP memory (RAM) and software for control of their own work, with the main functions is to serve as a corrective message. Store news Change the code to collect or distribute the characters. Controls the rate of speed in traffic. Queued data. Check for errors in data transmission 9. stm Mu Mu, Lake (Emulator) is a device that serves the Lake changed from newsgroup protocols-one into newsgroup. Once the Protocol that is used, but it is a hardware device or a software program. Sometimes it may be both by making the computer plugged it seems as one Terminal. The host computer or the current popular use of Mini PC used as the terminal of a mainframe computer. This is because more and when it is in contact with the main frame, mini or can be used as a PC. 10. restart p scooters (Repeater) is a device used for transmitting the following to send a signal on the remote signal, which prevents the loss of form of each network as well as cable that is used as an intermediary, or the intermediary for each type, there will be constraints on the transmission distance. Therefore, when you want to send a signal, beyond the normal need to connect it to the PC scooters. To be able to send signals farther. 11.การ์ดเครือข่าย (Network Adapter) หรือ การ์ด LANเป็นอุปกรณ์ทำหน้าที่สื่อสารระหว่างเครื่องต่างกันได้ไม่จำเป็นต้องเป็นรุ่นหรือยี่ห้อเดียวกันแต่หากซื้อพร้อมๆกันก็แนะนำให้ซื้อรุ่นและยีห้อเดียวกันจะดีกว่าและควรเป็น การ์ดแบบ PCI 3.12สายสัญญาณเป็นสายสำหรับเชื่อมต่อเครื่องคอมพิวเตอร์ต่างๆในระบบเข้าด้วยกัน หากเป็นระบบที่มีจำนวนเครื่องมากกว่า 2 เครื่องก็จะต้องต่อผ่านฮับอีกทีหนึ่ง
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