SigFox Frame Structure | SigFox MAC Frame Downlink, Uplink
This page describes Sigfox frame structure. It mentions both sigfox downlink MAC frame and sigfox uplink MAC frame structures.
The MAC layer is part of Sigfox protocol stack>> as defined in LTN protocol specifications.
The table below mentions description of Sigfox MAC frames used in the uplink and downlink directions.
| MAC Frame Type | Fields with size |
|---|---|
| Uplink MAC Frame (UNB implementation) | Preamble (4 bytes) Frame synchronization (2 bytes) End Point ID (4 bytes) Payload (0 to 12 bytes) Authentication (var. length) FCS (2 bytes, used as CRC) |
| Downlink MAC Frame (UNB implementation) | Preamble (32 bits or 4 bytes) Frame synchronization (13 bits) Flags (2 bits) FCS (8 bits) Authentication (16 bits) Error codes (variable) Payload (Variable) |
References: ETSI GS LTN 001, 002, 003 (Low Throughput Networks) documents.
SigFox tutorial RELATED LINKS
SIGFOX Tutorial Main Page SIGFOX Network Architecture SIGFOX Protocol Stack SIGFOX Frame structure Advantages and Disadvantages of Sigfox SIGFOX Vs GSM SIGFOX Vs Wireless M-Bus SIGFOX technology basics NB IoT vs SIGFOX vs LoRa