TS Supplement (Includes RFC-1006 Support)

CC-TPDU

TPDUs Used by RFC-1006

5–2 107751 Tandem Computers Incorporated

CC-TPDU Connect Confirm (CC) TPDUs, when used with RFC-1006, are different from OSI/TS

CC-TPDUs in the following ways:

RFC-1006 permits you to select a much larger DT-TPDU size (up to 65531 octets).

The size specified must not be larger than the proposed DT-TPDU size in the CR-

TPDU.

RFC-1006 permits you to select the use of transport expedited data transfer service.

This information is contained in the Variable Part field.

RFC-1006 permits you to transmit up to 32 octets of User Data.

The format of the RFC-1006 CC-TPDU is shown in Figure 5-1:

Figure 5-1. CC-TPDU

Octet

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

CC CDT DST-REF SRC-REF Class Options

Variable Part User Data

TPDU Header

061

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

1110). This value is in octet 1.

The connection confirm code is set to 1101. 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

Identifies the initiator that sent the CR-TPDU. This value should be the same as

the SRC-REF field in the corresponding CR-TPDU. This value is in octets 3 and 4.