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Eicon Connections for Linux User’s Guide
page 77
APPENDIX C
Key Packet Formats
Details of the Packet Format for the X.25 Packets used in call establishment and call clearing
are provided in this section. It describes the fields that must be filled by the application.
Call Request Packet Format
The format for a Call Request Packet is shown below. Octets consist of bits numbered 7 to 0
where bit 0 is the low order bit and is transmitted first. Octets are consecutively numbered
starting from 1 and are transmitted in this order. See the CCITT X.25 Recommendation for
details.
*Semi-octet of zeroes is present only if combined total digits in DTE address block is odd
The first three octets (up to and including Packet Type Identifier) are handled by the Eiconcard
X.25 Development Kit. The rest of the octets are built from information supplied by the
application program.
General Format ID Logical Channel Group
Logical Channel Number
Packet Type Identifier
0 0 0 0 1 0 1 1
Calling DTE Address Length Called DTE Address Length
Called DTE digit-1 ...
Callled DTE digit-n Calling DTE digit-1
Calling DTE digit-2 ...
Calling DTE digit-n 0* 0 0 0
Facility Length
Facilities
...
Call User Data
...
Call Request Packet Format
Bit
7 6 5 4 3 2 1 0
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