4.1 Circuit LAN (Lan card).
PCB Land .
Communication between computers in close proximity , such as in a computer lab . When a prior press release , double click the icon to view network computer network and see the icon of the machine. Computer that can connect to each other. By Adrian can check . Muted by Restyled difficult to drive in the machine , eg the license application or a copy of the information placed on the machine you use to connect the machine. Each computer uses the signal cable connection via Ethernet circuit board which is installed adds to the picture above, or it could be a success . Installed in the main panel directly below it on the lower legs .
LAN circuit installed in the main panel to the frame .
Round the back of the motherboard.
Connection is called. Network specific network (Local Area Network or LAN) wires for each . The combined signal devices called hubs (hub).
4.2 hub (hub) due to the network cable between the computer will have a second option only if you want to connect more than 2 computers only have access to the centralized procedure . Connectivity , called hubs .
Wires connected to the LAN of each cycle to come. Acted as the hub. Which serves as the interface between the individual machines outside the hub of this new amplifier can also add to the lines . Signals to send data to a remote destination called switching (switching).
8- channel hub for small networks .
Hubs come in different sizes depending on the application requirements , eg hub 8- channel is brought to a computer connected to the Internet , every computer is connected to 7 and the channel relevancy signal to the modem us . router.
4.3 modem (modem).
Internal modem type ( left) and external modem type (right ) .
Modem (modem) is a device used to convert the signal. Computer system to the telephone and called the modulation signal of the phone. Received back. Signal of the computer. To our computer . Can communicate with computers on Sat the other is remote is called Area Network Wide (Wide Area Network or WAN WAN) such as the Internet modem has two types of the circuit boards installed in the system. and type of cartridges separately. The outside air . The main panel is most popular within the modem to supply more custom .
The Internet through a modem. Students must Sืืg hour use of the Internet or ISP (ISP: Internet Sevvice Provider) with several companies. Fees will vary according to the number of hours the system is analog with such speed as kbps 56.6 KBps (56.6 Kbps 1 kilo = 1,000 ), which is considered very slow. But there are advantages for the use of occasional
4.4 high speed Internet ADSL.
(Asymmetric Digital Subscriber Line).
ADSL high speed Internet is the Internet. High-speed digital phone service offered by the home phone , high speed . To the computer system via modem Lahore , Lahore and on the PDA computer will charge a monthly price depends on the service speed is measured in megabits ( 1 MW = 1,000,000) .
4.5 System line rental (lease line).
Rent Rent -line system is a direct line of contact between the TOT for service directly to the tenant , such as the Internet of the Lab School . Office of the Basic Education Commission ( formally ) leased line is connected between the computer center . From the Ministry of Education to the school directly.
4.6 Wireless (wireless).
The cable can also be linked with the system using radio wave signal , called access point converts . Electrical signal into a radio frequency signal transfer center transfers . Signal to the computer , such as ordering food in large restaurant . Employees are palm -sized computer for the a la carte items , the data is sent . As radio waves to transfer center near the center will send the item. Food to a computer in the kitchen. Then print out the list . Comes with a list of the accounts to the computer to calculate and print a receipt .
4.7 Telephone modem terminal (modem router).
Telephone modem charters .
And on the telephone service , high -speed broadband modem to the digital receiver of the telephone system. Then exported to a computer via a LAN but only has 4 channel output signal from up to a routing device (router) is consistent with the connection to the PC. Have more than one so-called modem is a modem , router and routing equipment .
4.8 system - services (client - server system).
Used library system - is available.
In addition, a link to the computer I already have a network systems and services. A computer with a high speed and a storage device that is acting as . Server (sever) linked to the local LAN are stored in various applications such as training programs, English conversation program library system. Computers connect to the system. Landon is all . The client (client) for both the client and server will be named as a unique numeric code , such as 190.168.0 . 190.168.0.01 00 and go until all the air . Candidate set of numbers called an IP address (IP address).
Mr. Maney 's students want to learn English , it is linked to . Of the students . The service is called , the login (login) then the program without this program to the students.
Using the internet is the same. Machine can control the level of the various websites and also record the date and time the student enters the site administrators to check that students do not Chืeื What aggravated into any website at any time.
4.9 digital camera (digital camera) and Scanners (scanner).
Cameras are activated by light through the lens and falls . Impact on the film , which serves as a backdrop for a photo before I Mืื visibility. Of the human eye . A digital camera was used to monitor the same, but substituting the film. On endoscopy to what you would see on the screen when pressed once and the screen shot will be saved . In memory of the object in the form of digital data, the number of images stored on the memory size of the time with crispy garlic . Mobile phone Photographed with the same camera on the machine. Computer camera . Is displayed on the computer screen and can Stored in a computer or system . Print the printer immediately.
Scanner is known as Thailand 's . A random check or a random image. Act indiscriminately as printed images or messages . Switch to digital . Scanner copier is working with the light to the document. Placed to reflect light back to the optical signal to the reader to an electrical signal. In digital form . Then save it as an image file .
Some printers also print images and text also . Raw scan and copy on the same machine .
