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integers as per Table 6-1 2.
6.5.4.2.3 VDL private parameters. The parameter
identifier field shall allow simple identification of the purpose
of the parameter as defined in Table 6-13.
6.5.4.2.4 General purpose information private para-
In the tables included in the subsections to this section, the meters. Both aircraft and ground-based LMEs shall use general
following order is implied: purpose information private parameters to transfer basic
information to each other.
a) bit order in each parameter value shall be indicated by
subscript numbers. Bit I shall indicate the least 6.5.4.2.4.1 VDL private parameter set identifier: The
significant bit; and VDL private parameter set identifier shall be the IS0 IA5
character capital "V" encoded as per Table 6-14. This
b) bits shall be transmitted octet by octet, starting with Pammeter be whenever any the private
parameter id, and wihin octet the fightmost parameters are sent. It shall be the first private parameter sent
bit (as shown in the tables) shall be transmitted first. per IS0 8885.
Note I.- The tables are divided into three major columns
that de$ne the field name, the bit encoding and brief
expla~zatoryn ates.
Note 2.- Requirements for the use qf the parameters
defined in the following sectio~zsa re defined in 6.5.4.4.
6.5.4.2.1 Encoding. The XID information field shall be
encoded per IS0 8885 and may include the parameters
described in 6.5.4.2.2 to 6.5.4.2.7.
6.5.4.2.2 Public parameters. XID parameters shall be
encoded as defined in IS0 8885, with the addition of the
private parameter data link laycr subfield as defined in IS0
8885. The format identifier (hcxadecimal 82) shall be used
(per IS0 4335.2, Annex C) to identify the public parameter
list identified in IS0 8885. The VDL shall use the public
parameter group ID of hexadecimal 80 to negotiate the
common HDLC parameters. The public parameter set ID shall
be included in XID frames if other public parameters are
included; the public parameter set ID shall not be included in
XID frames if other public parameters are not included.
6.5.4.2.4.2 Connection management parameter: This
parameter defines the type of XID sent and the connection
options negotiated for that particular link. It shall be used in
XID frames sent during link establishment and ground-based
initiated ground station handoff and shall be encoded as per
Tables 6-15, 6-16 and 6-17. An LME shall set the reserved
bits to 0 on transmission, and shall ignore the value of these
bits on receipt.
6.5.4.2.4.3 Signal quality parameter (SQP). This
parametcr defines the received signal quality value of the Past
received transmission from the destination of the XID. It shall
be encoded as a 4-bit integer as per Table 6-18. If the transmitting
LME included the SQP parameter in the XID-CMD
{P=l) frame, then the responding LME shall also include it in
the respective XlDRSP (F-1) frame.
Note.- This parameter will be used for testing purposes.
6.5.4.2.4.4 XID sequencing parameter This parameter
defines the XID sequence number (sss) and an XID retransmission
number (mr). It shall be encoded as per Table 6-19.
6/11/97
No. 72
Annex 20 - Aeronautical Telecommunications Volume III
An LME shall increment the sequence number for every new
XJD (setting the retransmission field to 0 on the first
transmission) and shall increment the retransmission field after
every retransmission. In an XU-RSP, the sequence number
shall be set to the value of the XID-CMD sequence number
generating the response (the retransmission field shall be
ignored).
6.5.4.2.4.5 AVLC specific options parameter: This
parameter defines which AVLC protocol options are supported
by the transmitting station. It shall be encoded as per Tables
6-20 and 6-21. An LME shall set the reserved bits to 0 on
transmission, and shall ignore the value of these bits on
receipt. When both this parameter and the Connection
Management parameter are included in an XlD, the bit values
for those options which are included in both parametcrs shall
be determined by thc Connection Management parameter.
6.5.4.2.4.6 Expedited subnetwork connection parameter:
This parameter defines the expedited packets that the current
XID contains. This parameter, which may be rcpeated, shall
contain one and only one of the following subnetwork packets:
CALL REQUEST, CALL CONFIRMATION, or a CLEAR
REQUEST. It shall be encoded as Table 6-22. The inclusion
of this pararneter shall invoke the expedited subnetwork
connection procedures. This parameter shall only be included
if the ground LME indicates that it supports expediting
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