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

DR-TPDU
TPDUs Used by RFC-1006
5–10 107751 Tandem Computers Incorporated
Reason
The reason defines the cause of the transport connection disconnect. This field can
have the following values:
Value Meaning
0 A reason is not specified.
1 Congestion at the TSAP.
2 The Session entity is not attached to the TSAP.
3 The address is unknown.
Variable Part
Contains additional information related to the clearing of the connection. Figure
5-6 illustrates the Variable Part field of the DR-TPDU.
Figure 5-6. Variable Part of the DR-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
Parameter Code
The value is 1110 0000.
Parameter Length
Indicates the length of Parameter Value. The length can be any value
provided that the length of the DR-TPDU does not exceed the confirmed
maximum length of the TPDU.
Parameter Value
User defined.
User Data
Up to 64 octets of transport service user data are permitted in the DR-TPDU.