The optional PIP data can be anything that the application program includes as parameter data when setting up the conversation. The layout of the PIP variable follows:

Byte

Meaning

0–1

Length in binary of the PIP variable, including the length bytes

2–3

General data stream (GDS) identifier (X'12F5')

4–n

Zero or more PIP subfields, each of which has the following format:

Byte

Meaning

0–1

Length in binary of the subfield, including the length bytes

2–3

GDS ID (X'12E2')

4–m

PIP subfield data