Physical layer in ISO OSI Model
Functions of Physical layer in ISO OSI Model
Physical layer deals with electrical , mechanical , functional and procedural characteristics interface and media.
1. Representation of bits.
2. Synchronization of bits.
3. Topological specification.
physical layer is responsible for selecting the appropriate topology. ( bus, ring,mesh, star,tree )
4. Type of link.
Point to Point.
5. Define transmission mode.
Simplex : Here data can be transmitted only in one direction.
eg. keyboard, CPU to monitor.
Half Duplex : Here data can be transmitted in both directions but not simultaneously.
Full Duplex :Here data can be transmitted in both directions simultaneously.
eg. telephone cable. computer cable.