Functions of header subfields

Discussion

• Prajakta Pandit   -Posted on 07 Oct 15
  - For transferring data from one machine to another, we can use different methods in networking.
  - ATM (Asynchronous Transfer mode) is a part of networking that can be used for transferring the data.
  - ATM is a packet oriented transfer technique, which is based on the use of fixed length cell.
  - This cell is classified into two sections,
  1. Header
  2. Payload
  - Header consists of 5 bytes that identify the cells belonging to the same virtual channel.
  
  - The following functions are performed by header subfields,-
  
  1. Virtual path identifier
  2. Header error control
  3. Cell loss priority
  
  1. Virtual path identifier
  - It creates a path for the network routing.
  
  2. Header error control
  - It provides CRC (Cyclic Redundancy Check) calculation over the header field for error detection and correction which helps to reduce the cell loss problem and mis-routing due to transmission errors.
  
  3. Cell loss priority
  - It identifies the lower priority cells which can be discarded on the basis of network condition.

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