3.2.1.5.3.1 Connection Establishment

The connection establishment protocol sequence illustrates establishing a virtual connection between a client and a server. The name of this sequence is CONN. It has three PDU groups.

Group name	Meaning
A	PDUs sent on the OUT channels that initiate and perform the virtual connection establishment
B	PDUs sent on the IN channel
C	PDUs sent on the OUT channels that complete virtual connection establishment

Figure 17: Connection establishment protocol sequence

The references for the PDUs used in this protocol sequence are as follows.

Diagram label	PDU name and reference section
IN channel request	IN Channel Request (section 2.1.2.1.1)
OUT channel request	OUT Channel Request (section 2.1.2.1.2)
OUT channel response	Out Channel Response (section 2.1.2.1.4)
Legacy server response	Legacy Server Response (section 2.1.2.2.1)
A1	CONN/A1 RTS PDU (section 2.2.4.2)
A2	CONN/A2 RTS PDU (section 2.2.4.3)
A3	CONN/A3 RTS PDU (section 2.2.4.4)
B1	CONN/B1 RTS PDU (section 2.2.4.5)
B2	CONN/B2 RTS PDU (section 2.2.4.6)
B3	CONN/B3 RTS PDU (section 2.2.4.7)
C1	CONN/C1 RTS PDU (section 2.2.4.8)
C2	CONN/C2 RTS PDU (section 2.2.4.9)

The processing rules for this protocol sequence are specified in sections 3.2.2 through 3.2.5 of this specification.

Note In an effort to improve readability, the establishments of TCP connections are not shown in the figure.