OSI/AS Programming Manual

APS_CAPDATA_REQ_
APS Procedure Calls
3–58 056783 Tandem Computers Incorporated
Considerations
The maximum amount of user data you can send with this primitive depends on
the layer of your connection, whether you are using session version 1 or session
version 2, and (for presentation and ACSE connections) whether your connection
is in normal mode or X.410-1984 mode. The maximum length of the user-data
parameter is as follows:
Session version 1 Session version 2
Session connection 512 bytes 10240 bytes
Presentation connection (normal mode) < 512 bytes < 10240 bytes
ACSE connection (normal mode) < 512 bytes < 10240 bytes
For a normal-mode presentation or ACSE connection, you can send as much data
as will fit in a 512-byte PPDU (for session version 1) or a 10240-byte PPDU (for
session version 2); the maximum length depends on the encoding.
For a presentation or ACSE connection in X.410-1984 mode, the maximum amount
of data is the same as that for a session connection.
After you call APS_CAPDATA_REQ_ , you cannot call the same procedure a
second time until you have received the capability data confirm primitive from the
first call.