X.25

• X.25 Layer 3 packet

• General Format Identifier (GFI): 4-bit group number, identifies the general format of the packet header

• Logical Channel Identifier (LCI): 12-bit virtual circuit number

• Packet Type Identifier (PTI): identifies one of 17 packet types

GFI

LCI

PTI

User Data

Previous slide

Next slide

Back to first slide

View graphic version