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AIXLink/X.25 1.1 for AIX: Guide and Reference

CCITT-Specified Facilities to Support the OSI Network

The CCITT-specified facilities that support the OSI network include:

Calling Address Extension

The calling address extension facility has a variable parameter length. The Calling Address Extension Call Packet figure shows the call packet coding.

0 0xCB
1 Number of bytes following
2 Use Length of calling extension address
3 Calling extension address (BCD)
*

where:

0xCB Specifies the calling address extension facility.
Use Indicates the usage for the calling address extension. Valid values are:
00 Carry an entire calling OSI NSAP address.
01 Carry a partial calling OSI NSAP address.
10 Carry a non-OSI calling address.
11 Reserved.
Length of calling extension address Specifies the length of the calling extension address in bytes.
Calling extension address Specifies the calling address extension. The value can be up to 40 decimal digits, coded in BCD.

Called Address Extension

The called address extension facility has a variable parameter length. The following figure shows the call packet coding.

0 0xC9
1 Number of bytes following
2 Use Length of called extension address
3 Called extension address (BCD)
*

where:

0xC9 Specifies the called address extension facility.
Use Indicates the usage for the called address extension. Valid values are:
00 Carry an entire called OSI NSAP address.
01 Carry a partial called OSI NSAP address.
10 Carry a non-OSI called address.
11 Reserved.
Length of calling extension address Specifies the length of the called extension address in bytes.
Calling extension address Specifies the called address extension. The value can be up to 40 decimal digits, coded in BCD.

Minimum Throughput Class

The minimum throughput facility has a parameter length of 1 byte. The Minimum Throughput Class Call Packet figure shows the call packet coding.

0 0x0A
1 Calling minimum throughput Called minimum throughput

where:

0x0A Specifies the minimum throughput class facility for quality of service negotiation.
Calling minimum throughput Specifies the throughput class requested for data to be sent by the calling DTE. Valid values are:
0x07 1200 bits
0x08 2400 bits
0x09 4800 bits
0x0A 9600 bits
0x0B 19200 bits
0x0C 48000 bits
Called minimum throughput Specifies the throughput class request for data sent from the called DTE. Valid values are the same as those for the calling minimum throughput class.

End-to-End Transmit Delay Facility

The end-to-end transmit delay facility has a variable parameter length. The End-to-End Transmit Delay Call Packet figure shows the call packet coding.

0 0xCA
1 Length (of the following area)
2 Cumulative (transit delay in milliseconds, binary, high byte first)
3 Cumulative (transit delay in milliseconds, binary, high byte first)
4 Requested end-to-end (delay in milliseconds, binary, high byte first)
5 Requested end-to-end (delay in milliseconds, binary, high byte first)
6 Maximum acceptable (transit delay in milliseconds, binary, high byte first)
7 Maximum acceptable (transit delay in milliseconds, binary, high byte first)

where:

0xCA Specifies the end-to-end transit delay facility for quality of service negotiation.
Length Specifies he number of values in the stream. Valid values are 1, 2, or 3, since requested end-to-end delay and maximum acceptable transit delay are optional.
Cumulative Specifies the cumulative transit delay in milliseconds, coded in binary, high byte first.
Requested end-to-end Specifies requested end-to-end delay in milliseconds, coded in binary, high byte first.
Maximum acceptable Specifies the maximum acceptable transit delay in milliseconds, coded in binary, high byte first.

Expedited Data Negotiation

The expedited data negotiation facility has a parameter length of 1 byte. The Expedited Data Negotiation Call Packet figure shows the call packet coding.

0 0x0B
1        |       |       |       |       |       |              |       |       |       |       |       |       A

where

0x0B Specifies the expedited data negotiation facility.
A Specifies one of the following values:
0 No use of expedited data
1 Use of expedited data
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