Copyright

Physical Layer of the OSI Model: Definition, Components & Media

An error occurred trying to load this video.

Try refreshing the page, or contact customer support.

Coming up next: Internet Connectivity and Communication Standards

You're on a roll. Keep up the good work!

Take Quiz Watch Next Lesson
 Replay
Your next lesson will play in 10 seconds
  • 0:04 The OSI Model Physical Layer
  • 0:42 Physical Layer Components
  • 1:18 Physical Layer Cable Types
  • 1:53 Physical Layer Cable…
  • 2:30 Physical Layer…
  • 2:48 Lesson Summary
Add to Add to Add to

Want to watch this again later?

Log in or sign up to add this lesson to a Custom Course.

Log in or Sign up

Timeline
Autoplay
Autoplay
Speed

Recommended Lessons and Courses for You

Lesson Transcript
Instructor: Meghalee Goswami
This lesson discusses the 7th or physical layer of the OSI model. It also discusses the various components and media used in this layer for the transfer of data. Wired data transmission in the physical layer and its associated components will be broadly covered.

The OSI Model Physical Layer

OSI stands for Open Systems Interconnection Model. The physical layer in the OSI Model is the lowest layer and is used for transmitting data in its basic form: bit-level. The transmission medium can either be wired or wireless. Physical layer components in a wired model include cables and connectors that are implemented for carrying data from one place to another. Data is transmitted in the form of electromagnetic signals, which translates to a stream of bits. Over the past few years, there has been rapid growth in wireless data transmission as well. Due to the availability of internet, Wi-Fi and Bluetooth communications are becoming a norm.

Physical Layer Components

Basic hardware components used in the OSI physical layer include network interface cards (NICs), connectors and interfaces, and cables that facilitate the transmission of data from source to destination.

Network Interface Card
Network card

The Network Interface Card is a component installed in a computer in order to connect it to any available network. Connectors and Interfaces are used to connect cables from one source to another. Depending upon the type of cable used, connectors are chosen accordingly. Cables are physical components that carry electromagnetic or optic signals through them and transmit them from a network source to a network destination.

Physical Layer Cable Types

There are 3 main types of cables used in networking: shielded twisted pair, unshielded twisted pair, and coaxial.

  • Shielded Twisted Pair: This cable type involves placing foil shielding around pairs of twisted wires to prevent electromagnetic interference.


Shielded Twisted Pair Cable
Shielded twisted pair


  • Unshielded Twisted Pair: This cable type is made the same way as a shielded twisted pair but without the extra foil shielding around the wires.


Unshielded Twisted Pair Cable
Unshielded twisted pair


  • Coaxial cable: This cable type contains a wire covered by alternative conducting and insulating shields. This makes the cable more reliable when connecting different networks.


Coaxial Cable
Coaxial Cable


Physical Layer Cable Connections

Just like we have different cables used for creating networks, we also require specific types of connectors that connect these cables based on network type:

To unlock this lesson you must be a Study.com Member.
Create your account

Register to view this lesson

Are you a student or a teacher?

Unlock Your Education

See for yourself why 30 million people use Study.com

Become a Study.com member and start learning now.
Become a Member  Back
What teachers are saying about Study.com
Try it risk-free for 30 days

Earning College Credit

Did you know… We have over 200 college courses that prepare you to earn credit by exam that is accepted by over 1,500 colleges and universities. You can test out of the first two years of college and save thousands off your degree. Anyone can earn credit-by-exam regardless of age or education level.

To learn more, visit our Earning Credit Page

Transferring credit to the school of your choice

Not sure what college you want to attend yet? Study.com has thousands of articles about every imaginable degree, area of study and career path that can help you find the school that's right for you.

Create an account to start this course today
Try it risk-free for 30 days!
Create an account
Support