April 2013 Archive


2541
Cable
Cable

Many residences in the North America and elsewhere receive hundreds of broadcast television channels over coaxial cable networks. (We will discuss coaxial cable later in this section.) In a traditional cable television system, a cable head end broadcasts television channels through a

Tags distribution network, dsl, protocol
1665
Fiber-To-The-Home
Fiber-To-The-Home

Fiber optics (to be discussed in "Physical Media") can offer considerably higher transmission rates than twisted-pair copper wire or coaxial cable. Some local telcos (in many different countries), having recently laid optical fiber from their COs to homes, now provide high-speed

Tags transmission rate, distribution network, telco
1427
Ethernet
Ethernet

On corporate and university campuses, a local area network (LAN) is typically used to connect an end system to the edge router. Though, there are many types of LAN technologies, Ethernet is by far the most widespread access technology in corporate and university networks.

Tags lan, end system, router
1564
WiFi
WiFi

Increasingly, people access the Internet wirelessly, either through a laptop computer or from a mobile handheld device, such as an iPhone, Blackberry, or Google phone. Today, there are two common types of wireless Internet access. In a wireless LAN, wireless users

Tags lan, packets, transmission rate
1517
Wide-Area Wireless Access
Wide-Area Wireless Access

When you access the Internet through wireless LAN technology, you normally require to be within a few tens of meters of the access point. This is reasonable for home access, coffee shop access and more commonly, access within and around a building. But what if you are on the

Tags lan, cellular network, protocol
1656
Physical Media
Physical Media

In the earlier subsection, we gave general idea of some of the most important network access technologies in the Internet. As we explained these technologies, we also indicated the physical media used. For instance, we said that HFC uses a combination of fiber cable and coaxial

Tags end system, router, lan
1770
Twisted-Pair Copper Wire
Twisted-Pair Copper Wire

The least expensive and most frequently used guided transmission medium is twisted-pair copper wire. For over a hundred years it has been used by telephone networks. In reality, more than 99 percent of the wired connections from the telephone handset to the local telephone

Tags modem, dsl, isp
1264
Coaxial Cable
Coaxial Cable

Like twisted pair, coaxial cable is made of two copper conductors, but the two conductors are concentric rather than parallel. With this construction and special insulation and shielding, coaxial cable can have high bit rates. Coaxial cable is quite common in cable television

Tags modem, end systems, analog signal
1260
Fiber Optics
Fiber Optics

An optical fiber is a thin, flexible medium that conducts pulses of light, with each pulse representing a bit. A single optical fiber can support remarkable bit rates, up to tens or even hundreds of gigabits per second. They are resistant to electromagnetic interference, have very low

Tags links, lan, optical networking
1686
Terrestrial Radio Channels
Terrestrial Radio Channels

Radio channels carry signals in the electromagnetic spectrum. They are an attractive medium because they need no physical wire to be installed, can go through walls, provide connectivity to a mobile user, and can potentially carry a signal for long distances. The features of a radio channel

Tags lan, radio channels, electromagnetic signals
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