TS Supplement (Includes RFC-1006 Support)

CR-TPDU

TPDUs Used by RFC-1006

5–6 107751 Tandem Computers Incorporated

Figure 5-3. CR-TPDU

Octet

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

CR CDT DST-REF SRC-REF Class Options

Variable Part User Data

TPDU Header

060

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

include the length of the LI and User Data fields.

The value is a binary number with a maximum value of 254 (1111 1110). This

value is in octet 1.

The connection request code is set to 1110. This value is in bits 8 to 5 of octet 2.

CDT

The initial credit allocation is set to 0000. This value is in bits 4 to 1 of octet 2.

DST-REF

The destination reference is ignored in the CR-TPDU and is set to 0. This value is

in octets 3 and 4.

SRC-REF

The source reference identifies the transport entity initiating this CR-TPDU. This

value is in octets 5 and 6.

Class

Class specifies the preferred OSI transport protocol class selected by the

transport entity initiating the CR-TPDU. It has the value of 0000 and is in bits 8 to

5 of octet 7.

Options

Options is not used when using RFC-1006. It has the value of 0000 and is in bits

4 to 1 of octet 7.