CSC 170 - Introduction to Computers and Their Applications

CSC 170 - Introduction to Computers and Their Applications
CSC 170 - Introduction to
Computers and Their
Applications
Lecture 8 –Internet Basics
Connection Basics
• Data travels over the
Internet at an incredible
speed, but that speed
varies; some Internet
services are faster than
others
• It is easy to check the
speed of your Internet
connection by running a
few online tests
Connection Basics
• The most common measurement of connection
speed is the amount of data that can be
transmitted in a specified time; technically, it is
a measure of capacity.
Connection Basics
Connection Basics
• ISPs control connection speeds based on the service plan
you’ve selected
• Your bandwidth cap is the top speed allowed by your
plan
• During peak times, ISPs can place further limits on speed,
a process called bandwidth throttling
• When Internet upload speed differs from download speed,
you have an asymmetric connection
• When upload and download speeds are the same, you have
a symmetric connection
Connection Basics
• Ping is utility software designed to measure
responsiveness
• Ping rate indicates how quickly data can reach a server
and bounce back to you
• Latency is the elapsed time for data to make a round-trip
from point A to point B and back to point A
• Jitter measures the variability of packet latency caused
when network traffic and interference can delay packets
and create erratic data flow
• Packet loss refers to data that never reaches its destination
or gets discarded because it arrives too late.
Connection Basics
• To determine whether or not your slow
Internet connection is caused by your ISP or
your computer you can use a Traceroute, a
network diagnostic tool that lists each router
and server.
Connection Basics
Connection Basics
• Although public Internet access is available
in many locations, such as coffee shops and
libraries, most consumers like the
convenience of having their own Internet
connection.
Connection Basics
Cable Internet Service
• The gold standard of fixed Internet access is cable
Internet service, which is offered by the same
companies that supply cable television.
• CATV stands for community antenna television.
• With cables branching out from a central location,
the topology of a CATV system works well as the
infrastructure for a digital data network.
Cable Internet Service
• CATV coaxial and fiber-optic cables have plenty
of bandwidth to carry television signals for
hundreds of channels in addition to digital data.
• CATV cables provide bandwidth for television
signals, incoming data signals, and outgoing data
signals.
Telephone Network Internet Service
• Telephone companies offer four types of service:
dial-up, ISDN, DSL, and FTTH.
• A dial-up connection is a fixed Internet
connection that uses a voiceband modem and the
telephone company’s circuit-switched network to
transport data between your computer and your
ISP.
• A voiceband modem converts digital signals from
a computer into audible analog signals that can
travel over telephone lines.
Telephone Network Internet Service
Telephone Network Internet Service
• When you use a dial-up connection, a
voiceband modem places a regular
telephone call to your ISP; the circuit
remains connected for the duration of the
call to carry data between your computer
and the ISP.
Telephone Network Internet Service
• .
Telephone Network Internet Service
• ISDN stands for Integrated Services Digital Network; it
divides a telephone line into two channels, one for data and
one for voice, by using packet switching
• DSL (digital subscriber line) is a high-speed, digital,
always-on, Internet access technology that runs over
standard phone lines; it’s offered by AT&T’s U-verse
service
• FTTH (fiber-to-the-home) is the use of high-capacity
fiber-optic cables, rather than coaxial cables, to connect
homes to broader municipal networks
Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF

advertising