Transmitting Bits
Dennis Thrane
NT 1210
Unit 4 Lab
10/12/2014
Exercise 4.1.1 Why are standards so important for NICs, connectors, and media? Use your textbook and Internet research to justify your answer.
The physical level determines how the 0 and 1 bits are identified. So both ends need to know the voltage range for a 1 and for a 0. If they used different values then the data would be lost, or the voltage at the destination may be so high that the current delivered to the destination could destroy the receiver. The NIC has the MAC address which has to be unique on each Local Area Network. When a frame is sent the format of the frame has to be understood by the destination NIC. If the format of the frames were different then the two devices could not communicate.
Exercise 4.1.2 The voltage for registering a bit of 1 on Ethernet can be as low as 2.5 volts or even 1 volt. Why is this so low when the capacity for transmitting electricity on the copper wire is so high? Use your textbook and Internet research to support your answer.
Copper wire is used to power appliances which use more current. The difference is between signal circuits and power circuits. Signal circuits operate at extremely low current levels and use digital logic voltage levels (less than 5 VDC). Power circuits on the other hand require larger amounts of current to operate electrical devices such as motors, heating units, etc.
Exercise 4.1.3 What are some applications of shielded copper cable? Why is the more expensive shielded cable used in these situations? Use your textbook or Internet research to support your answer.
Microphones, PA systems, Audio cables, Power cables, and RG-6 Cables used for television. There are three reasons, that I can think of, to use shielded cable instead of unshielded. Radio Frequency Interference (RFI) was the earliest interference engineers had to deal with. Early radio signals easily found their way into devices. Coaxial cables and shielded twisted pairs using copper can eliminate
NT 1210
Unit 4 Lab
10/12/2014
Exercise 4.1.1 Why are standards so important for NICs, connectors, and media? Use your textbook and Internet research to justify your answer.
The physical level determines how the 0 and 1 bits are identified. So both ends need to know the voltage range for a 1 and for a 0. If they used different values then the data would be lost, or the voltage at the destination may be so high that the current delivered to the destination could destroy the receiver. The NIC has the MAC address which has to be unique on each Local Area Network. When a frame is sent the format of the frame has to be understood by the destination NIC. If the format of the frames were different then the two devices could not communicate.
Exercise 4.1.2 The voltage for registering a bit of 1 on Ethernet can be as low as 2.5 volts or even 1 volt. Why is this so low when the capacity for transmitting electricity on the copper wire is so high? Use your textbook and Internet research to support your answer.
Copper wire is used to power appliances which use more current. The difference is between signal circuits and power circuits. Signal circuits operate at extremely low current levels and use digital logic voltage levels (less than 5 VDC). Power circuits on the other hand require larger amounts of current to operate electrical devices such as motors, heating units, etc.
Exercise 4.1.3 What are some applications of shielded copper cable? Why is the more expensive shielded cable used in these situations? Use your textbook or Internet research to support your answer.
Microphones, PA systems, Audio cables, Power cables, and RG-6 Cables used for television. There are three reasons, that I can think of, to use shielded cable instead of unshielded. Radio Frequency Interference (RFI) was the earliest interference engineers had to deal with. Early radio signals easily found their way into devices. Coaxial cables and shielded twisted pairs using copper can eliminate