TS Supplement (Includes RFC-1006 Support)

DR-TPDU

TPDUs Used by RFC-1006

107751 Tandem Computers Incorporated 5–9

Additional Option Selection

When identifying the Additional Option Selection, if bit 1 is 1, transport

ED transfer service is used; if bit 1 is 0, transport ED transfer service is not

used.

User Data

Up to 32 octets of transport user data are permitted in the CR-TPDU.

DR-TPDU The Disconnect Request (DR) TPDU is unchanged when using RFC-1006. Figure 5-5

illustrates the DR-TPDU.

Figure 5-5. DR-TPDU

Octet

1 2 3,4 5,6 7 8-p p+1,q

LI DR DST-REF SRC-REF Reason Variable Part User Data

TPDU Header

105

The length indicator shows the TPDU header length in octets. This value does not

include the length of LI and User data.

The value is indicated by a binary number with a maximum value of 254 (1111

1110). This value is in octet 1.

The disconnect request code is set to 1000 0000. This value is in octet 2.

DST-REF

The destination reference is set to 0. This value is in octets 3 and 4.

SRC-REF

The source reference identifies the transport connection at the transport entity

initiating the TPDU. The value is 0 when the reference is unassigned and is in

octets 5 and 6.