Chapture 2 Understanding Fungsion and Operation Of Varioaus ICT Devices

A.Multiple coishe.(hal 77-79 Paket)

1. A
2. C
3. B
4. B
5. E
6. E
7. C
8. B
9. B
10. C

B. Essay

The Questins !

1. In ASCII code, by what code is letter W represented.
2. Name and explain all supporting devices inside a CPU
3. What is the abbreviation and the function of ROM ?
4. Name 3 examples of network interface cards.
5. Name several cables that use on a wired network.

The Answer !

1. The letter W is represented by the number code 87.
2. A CPU socket-which is where a microprocessor is placed. A memory slot which is where a computer memory is placed. A chipset which is a chip that regulates the interaction among devices, there are a southbridge chip and a northbridge chip: An expansion slot, such as PCI, AGP, and PCI Express: A power connector to receive electrical input from the power supply unit (PSU) and then distributes the electricity to all connecting devices.
3. ROM (Read Only Memory) is a permanent memory that can be read but cannot be updated. ROM is to save computer operation program, such as BIOS and booting.
4. Ethernet, arcnet, and token ring.
5. 5. a. Kabel UTP (Unishielded Twisted Pair)
         in consists of a pair of plastic wrapped conductor and each is colored. the frequency ranges from 100 Hz to 5 MHz. A UTP connector is required to install a UTP cable on network card, such as RJ 45 connector. The cost of UTP is relatively cheap.
       b. STP cable (Shielded Twishted Pair)
          STP  cable is similar with UTP cable, except that it has double wrap. The middle wrap is a metal shield or metal foil to avoid electromagnetic interference. Other than that STP cable connector and UTP cable connector are alike.
       c. coaxial Cable
   coaxial cable consists of a main copper conductor with three wraps. the first and third are plastic wraps. the first and third conductor are isolator, while the second web in the middle is a conductor. the connectors are BNC ( Bayonet Network Connector ). T-connector, and 50 ohm terminator. the terminator acts as a signal buffer in order not to obstruct the original signal.
       d. optical fiber.
   optical fiber is made of plastic or glass that acts as a medium for signal transmission in the form of light. connector for the optical fiber is an FO connector. optical fiber enable data transmission speed of Mbps-2 Gbps. moreover, the signal range is farther than any other cable types an as a wider bandwith. the optical fiber is fragile and therefore difficult to be moved and installed, needs an expensive maintenance, and the cost of the optcal fiber is relatively expensive.