module 4
august 29,
three types of media
Metal wires within cables - Data is encoded into electrical impulses.
Glass or plastic fibers within cables (fiber-optic cable) - Data is encoded into pulses of light.
Wireless transmission - Data is encoded via modulation of specific frequencies of electromagnetic waves.
There are three images of common network media followed by criteria to use when choosing network media. The top image shows a twisted pair of wires and connectors used with copper media. The middle image is a multi-strand fiber optic cable and fiber optic connectors. The bottom image shows wireless devices including a router and a camera. Different types of network media have different features and benefits. Not all types of network media have the same characteristics, nor are they appropriate for the same purposes. The four main criteria for choosing network media are as follows: What is the maximum distance the media can successfully carry a signal? What is the environment in which the media will be installed? What is the amount of data and at what speed must it be transmitted? What is the cost of the media and installation?
Coaxial Cable
Coaxial was one of the earliest types of network cabling developed. Coaxial cable is the kind of copper cable used by cable TV companies. It is also used for connecting the various components which make up satellite communication systems. Coaxial cable has a single rigid copper core that conducts the signal. This core is typically surrounded by a layer of insulation, braided metal shielding, and a protective jacket. It is used as a high-frequency transmission line to carry high-frequency or broadband signals.
Fiber-Optic Cable
Fiber-optic cable can be either glass or plastic with a diameter about the same as a human hair and it can carry digital information at very high speeds over long distances. Because light is used instead of electricity, electrical interference does not affect the signal. Fiber-optic cables have many uses as well as communications. They are also used in medical imaging, medical treatment, and mechanical engineering inspection.
They have a very high bandwidth, which enables them to carry very large amounts of data. Fiber is used in backbone networks, large enterprise environments, and large data centers. It is also used extensively by telephone companies
exam review:
matching bits to numbers
unique binary: two either on or off
what term represents the maximum and actual speed: bandwidth; throughput
throughput; Lancey
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dis and ad on p-p: not scaleabale
nfc- near field communtican
network information: DHCP
transfer domain devices in domain devices: DNS
signing into netacad
how to change preferences
learn each cable
end devices
ping: end to end devices