OSI/AS and OSI/TS Supplement (Includes RFC-1006 Support)

CC-TPDU
TPDUs Used by RFC-1006
107751 Tandem Computers Incorporated 5–3
SRC-REF
Identifies the responder that this CC-TPDU is being sent to. This value is in octets
5 and 6.
Class
Class specifies the selected OSI transport protocol class selected by the transport
entity initiating the CC-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 is set to 0000. It is in bits 4 to 1 of
octet 7.
Variable part
The Variable part is used to define less frequently used parameters. Each
defined parameter contains three fields:
Parameter Code
Parameter Length Indicator
Parameter Value
Information about the following three parameters can be included:
Transport Service Access Point Identifier (TSAP-ID)
TPDU Size
Additional Option Selection - this field is always included in the CC-TPDU
Figure 5-2 illustrates the Variable Part field of the CC-TPDU.
Figure 5-2. Variable Part of the CC-TPDU
065
Octets
• • •
•
•
•
Parameter
Code
Parameter
Length
Indicator
Parameter
Value
n + 1
n + 2 n + 3
8
1
Parameter
Code
Parameter
Length
Indicator
Parameter
Value
n + 4
n + 5 n + 6
Bits
Parameter
Code