X.25

PLP

GFI

LCI

PTI

Payload

Layer 3

Packet

LAPB

Frame Check

Flag Address Control

Packet

Flag

Layer 2

Frame

Sequence

X.21bis

Bit

Bit Stream

Layer 1

Stream

• forwarding equivalence class (FEC)
• FOTS (Fiber Optic Transmission System)
• FOTS (Fiber Optic Transmission System)
• fourth estate
• four-wave mixing (FWM)
• four-wire circuit
• FPLMTS (Future Public Land Mobile Telecommunications System)
• fps (frames per second)
• fractal
• fractal transform
• fractional T1 (FT1)
• FRAD (Frame Relay Access Device or Frame Relay Assembler/Disassembler)
• fragmentation
• fragmentation
• fragmentation
• fragment-free switch
• frame
• Frame
• Frame
• Frame
• Frame
• Frame-based ATM Transport over Ethernet (FATE)
• frame check sequence (FCS)
• Framed ATM over SONET/SDH Transport (FAST)
• frame rate