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Table of contents

Author: Bob Willis, K2GLS

PACKET RADIO Slide 2 Slide 3 Slide 4 Slide 5 PACKET FRAME STRUCTURES AX25.2.2 Standard PACKET FRAME STRUCTURES Information Frame (I frame) PACKET FRAME STRUCTURE PACKET FRAME STRUCTURES Unnumbered Frame (UI frame) Error Detection RTTY None Error Detection Example Single Bit Error Detection - Model 20 TTY Error Detection Example Error Detection Code – Checksum Error Detection Error Detection and Single Error Correction Packet Error Detection Frame Check Sequence (FCS) ISO 3309 Error Correction Packet Retransmission Packet Hardware In the Beginning there was TAPR and Heathkit Packet Hardware Today Radio – Computer Interface BUXCOM RASCAL TNC Packet Radio Commands Applications & Software