PPT Slide

Packet Structure, continued...

TRAINING

SEQUENCE

IDLE

FLAG

FCS

(CRC-16)

DATA

BUFFER

FLAG

• 168 bits. Longer is allowed by letting a packet cross slot boundaries.

• Content varies but always starts with message identifier (6 bits) and DTE/DI flags (2 bits).

• The message identifier gives information about:

- Message structure,

- Operating Mode,

- Mobile or Base,

- Communication State (SOTDMA, ITDMA).

• The DTE (Data Terminal Ready) flag indicates that an application is connected to the user interface.

• The DI (Data Indicator) flag indicates that the station has data to send, other than periodical reports.

DATA

MSG

ID

DTE

DI

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