ATM Cell

• Fixed cell size

• Overhead is ~10%

• Able to time the flow of cells

• Cell switching is fast & efficient

• Traffic flow is predictable

• Can guarantee time-sensitive info

• NNI cell does not have GFC field

Payload

Hdr

48-bytes

5-bytes

GFC Generic Flow Control

VPI Virtual Path Identifier

VCI Virtual Channel Identifier

PTI Payload Type Indicator

RES Reserved

CLP Cell Loss Priority

HEC Header Error Control

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