Connection Types Flashcards
How were dial up connections configured in the 90s?
It requires either an internal modem in the computer, or an external one connected by USB.
This is in turn connected to a phone socket using an RJ-11 connector.
Once the modem is physically installed, it must be connected to one of the computer’s software COM ports.
The modem must also be configured with local dialing properties such as the prefix for an outside line and the area code.
What are the internet connection technologies that have evolved over time?
Analog telephone.
Integrated Services Digital Network.
Broadband.
How did analog telephone work?
They transmitted data over standard voice telephone lines.
This used the analog modem to place a telephone call to another modem at a remote site.
This is known as dialup.
How does Integrated Services Digital Networks function?
ISDN uses multiple channels and can carry different types of services; therefore, it is considered a type of broadband.
ISDN is a standard that uses multiple channels to send voice, video and data over normal telephone wires.
ISDN bandwidth is larger than traditional dialup.
How does broadband work?
Broadband uses different frequencies to send multiple signals over the same medium. For example, the coaxial cables used to bring cable television to your home carry network transmissions at the same time as hundreds of TV channels. Your cell phone can receive voice calls while also using a web browser.
Some common broadband connections include cable, digital subscriber line 9DSL), ISDN, satellite and cellular.
What do both DSL and Cable do?
Use a modem to connect to the internet through an Internet Service Provider.
How does DSL connect to the internet?
It connects a user’s network directly to the digital infrastructure of the phone company.
How does Cable connect to the internet?
It connects the user’s network to a cable service provider.
What is DSL?
It is an always on service, meaning there is no need to dial up each time you want to connect to the internet.
Voice and data signals are carried on different frequencies on the copper telephone wires.
A filter prevents DSL signals from interfering with phone signals.
What is Cable?
A cable internet connect does not use telephone lines.
They use coaxial cable originally designed to carry television signals.
A cable modem connects your computer to the cable company.
Connecting a routing device to the modem allows multiple computers to share the connecting to the internet.
What is Fibrer Optic? Where is it used? How is it used in the modern world?
They are made up of glass or plastic and use light to transmit data.
They have a very high bandwidth.
At some point in your netwokr, you data will cross one of these transmission lines.
Fiber is used in backbone networks, large enterprise environmnets and large data centers.
Older copper cabling in the modern world is being increasingly replaced with FO.
In cable connections Hybried Fiber coaxial is used in the last mile of the transmission to your house.
At your home it switches back to copper coaxial.
What does the choice of cable depend on?
Geographical location and service provider availability.
What is line of sight wireless internet?
An always on service that uses radio signals in order to transmit internet access.
How does LOS work?
It sends from tower to a reciever that the userconnects to a networkor computer.
A clear path between the towerand user is required.
The tower may connect to others, or directly to an internet backbone connection.
What factors affect LOS perfromance?
Extreme weather conditions.
The frequency. Lower frequency of 900 MHz can travel up to 40 miles. A higher frequency of 5.7 GHz can only travel up to 2 miles.
