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Data Confirmation

Direction

MTP 2 -> Layer 3

Description

The DATA CONFIRMATION message notifies the layer 3 application that one or more transmitted MSUs have been acknowledged by the far end.

This message is also sent in response to an application status request to retrieve unacknowledged messages. In this case the status field indicates that this is unacknowledged and whether there are more unacknowledged messages coming or whether this is the last. One data confirmation is returned for each unacknowledged message.

Format

Service User ID Application's reference number for this link (from BIND REQUEST)

Status The status of this confirmation:

   0  Unacknowledged message, more to follow 
   1  Unacknowledged message, last 
   2  Message(s) acknowledged by far end
      (Credit contains number of messages
      acknowledged, data field not present)
Credit The number of messages acknowledged, when status field = 2.

Data The contents of the unacknowledged message (present only when status = 0 or 1).


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