Tag: Physical Layer

Physical Layer of OSI Model (Layer-1)

Physical Layer of OSI Model

Physical Layer of OSI Model is the first layer in seven layers for simplification. It is responsible for transmission of data between sending & receiving devices. It also defines the means of transmitting raw bits over the transmission media. Physical layer addresses how the data is carried over the Physical media rather than logical data packets over a physical data link connecting network nodes. Each layer in OSI Model has its own duties & specific functions to perform so that it can support the layers above it. Below figure shows the position of Physical layer in the OSI Model:   Read More …

OSI Model

OSI-Model

“OSI Model (Open Systems Interconnection Model) is a reference tool and a reference model for data communications in networks”. It was the first conceptual model for standardized communication in computer Network systems.   Why do we need OSI Model? We need OSI Model for solution to our multiple problems; few of them are described here. Firstly, it is a vendor neutral model. Before OSI Model, each vendor had to use its own network model to manufacture network equipment. So, one vendor’s equipment & the network was not compatible with another vendor’s equipment. Clients and buyers were forced to buy all Read More …