PPT Slide

The OSI -ISO Network ModelOpen Systems Interconnection - International Standards Organization

7. Application

Common protocols such as network virtual terminal, file transfer protocol (FTP)

6. Presentation

5. Session

4. Transport

3. Network

2. Data Link

1. Physical

electronic mail, and directory lookup.

Encoding/decoding including compression and cryptography.

Communication between processes including data exchange, remote Procedure

Lowest level at which messages are handled. Segmentation and reassembly of

Flow control to avoid congestion and also customer use and accounting. Link

Layer Control (LLC).

Presentation of error-free transmission to the network layer. Creates data frames

and receives acknowledge frames. Media Access Control (MAC)

Physical Layer Protocol (PHY) specifies coding (4B/5B), clock synchronization.

Physical Medium Dependent (PMD) sublayer provides digital baseband between

Call (RPC), synchronization, and activity management.

data to and from session layer. Transmission Control Protocol (TCP), Internet

Protocol (IP), User Datagram Protocol (UDP)

nodes. This layer specifies fiber-optic drivers, receivers, mechanical, cables,

connectors, optical signal requirements including power levels, jitter and BER.

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