We will discuss several aspects of networks in this lecture. First the communications channels, the transmission medium that the data is transferred over. The transmission medium consists of materials or techniques capable of carrying a signal. Then we will discuss transmission characteristics, which includes things like the transmission mode, transmission direction, and transmission rates. Then we will discuss transmission software, and finally
transmission devices any type of hardware capable of transmitting data, instructions, and information between a sending device and a receiving device. The last thing we will cover is types of networks, such as LAN, and WAN. Show
TRANSMISSION MEDIUMSWe have two groups of mediums to cover, physical and wireless. Physical Transmission mediaThese are cables usually used in buildings, or underground. The three main types of physical transmission mediums I will cover are twisted pair lines, coaxial cable, and fiber-optic cable
Wireless Transmission MediaWireless transmission is becoming more and more popular these days. One of the leading protocols that is being used is called 802.11b. The sub and a few other buildings on campus are talking about putting in a wireless network using 802.11, this means that if you turn on your laptop in the sub and you have a 802.11 modem you will have Internet access without plugging in a cable. Here are some other wireless protocols:
TRANSMISSION CHARACTERISTICSCharacteristics include signal type, transmission mode, transmission direction, and transmission rate. Signal Type
Transmission ModesHow the bits are moved between devices
Transmission direction
Transmission rate
Common carriers that you can get from the phone companies
TRANSMISSION SOFTWARE
COMMUNICATION DEVICESThe hardware that allows or helps allow the transmitting of data, instructions, and information between a sending device and a receiving device.
Connecting Networks
Networks
Network Line control Ya gotta have rules!
Intranets
Which of the following is a wireless transmission medium that distributes radio signals through the air over long distances?Broadcast radio is a wireless transmission medium that distributes radio signals through the air over long distances such as between cities, regions, and countries and short distances such as within an office or home.
What do you call the unit used in the data transfer between devices that communicate on a network?In telecommunications, a protocol data unit (PDU) is a single unit of information transmitted among peer entities of a computer network.
Which term refers to any and all communication devices used to transmit and/or store information?Information and communications technology (ICT) is an umbrella term that includes any communication device or application, encompassing: radio, television, cellular phones, computer and network hardware and software, satellite systems, and so on, as well as the various services and applications associated with them, ...
Which device allows the user to communicate to the computer?A classic example of a communication device is a computer modem, which converts a computer's digital information to an analog signal for transmission over a telephone line. Similarly, a modem receives analog signals, and converts them to digital, for processing by the computer.
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