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

CR-TPDU
TPDUs Used by RFC-1006
5–8 107751 Tandem Computers Incorporated
Additional Option Selection
When identifying the Additional Option Selection, indicates if transport
expedited data transfer service is used. The value is 1100 0110.
Parameter Length Indicator
This field can contain either the TSAP-ID, the TPDU Size, or the Additional
Option Selection:
TSAP-ID
When identifying the TSAP-ID, indicates the length of the TSAP contained
in Parameter Value.
TPDU Size
When identifying the TPDU Size, the value is 1 octet.
Additional Option Selection
When identifying the Additional Option Selection, the value is 1 octet.
Parameter Value
This field can contain either the TSAP-ID, the TPDU Size, or the Additional
Option Selection:
TSAP-ID
When identifying the TSAP-ID, identifies the calling or called TSAP.
TPDU Size
When identifying the TPDU Size, the values are as follows:
Value TPDU Size
0001 0000 65531
0000 1111 32768
0000 1110 16384
0000 1101 8192
0000 1100 4096
0000 1011 2048
0000 1010 1024
0000 1001 512
0000 1000 256
0000 0111 128