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Short data message (with ACK)

Submitted by jvgils on Fri, 03/31/2023 - 17:51

Physical link:

VDE-TER

msg_ID:

92

Extended description:

Short data message. ACK is required

Priority:

not applicable

Access scheme:

RATDMA

Communication state:

N/A

Transmitted by:

Mobile station

Base station

Table 38

Short data message (with acknowledgement)

Field no.	Value (dec)	Size (bytes)	Function	Content
1	92	1	Type
2	0 to 2¹⁶-1	2	Length	Total size in bytes, variable.
3	0 to 2³²-1	4	Source ID	The unique identifier of the transmitting station, as described in § 2.4, Annex 1.
4⁽¹⁾	0	1	Session ID	Session ID of data session.
5	0 to 2³²-1	4	Destination ID	Destination MMSI may not be set to zero (broadcast address).
6	0 to 255	1	Retransmission no	Starts with value 0 and increments with every retransmission. Handles lost ACKs Value of 255 indicates no ACK is requested.
7		Variable	Payload
Notes: Should always be transmitted on the RAC by ship and ASC by shore station. The short data message ACK message should be transmitted on the RAC by ship and ASC by shore. ⁽¹⁾ Session ID is reserved for future use.