Networks


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.

TRANSMISSION MEDIUMS

We have two groups of mediums to cover, physical and wireless.

Physical Transmission media

These 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 Media

Wireless 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 CHARACTERISTICS

Characteristics include signal type, transmission mode, transmission direction, and transmission rate.

Signal Type

Transmission Modes

How the bits are moved between devices

Transmission direction

Transmission rate

Common carriers that you can get from the phone companies

TRANSMISSION SOFTWARE

COMMUNICATION DEVICES

The 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