Physical layer of OSI model

GSCWU

1. Layers of OSI model

2. Layers of OSI model:

3. Physical layer: Physical layer is the lowest layer in the Osi model. It responsible for the actual physical connection between the devices. Physical layer is to move data in the form of electromagnetic signals across the transmission mediam. It responsible for movements of individual bit from node to next node. Transmission mediam work by conducting energy analog path which can be wired or wireless.

4. Example:

5. Working:

6. Function of physical layer: Physical characterstics of interface and mediam Interface between devices & transmission mediam Type of mediam Representation of bits encoding(change 0’s & 1’s into signals) Stream of bit without interpretation (sequence of bits)

7. Data link duration of a bit,how long it last Synchronization of bits sender & receiver clock must be synchronized Line configration point to multiple point point to point Physical topology Transmission mode simplex half duplex full duplex