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PARAMETER FORMATS
In the tables included in the subsections to this secti~n,t he
following order is implied:
a) bit order in each parameter value shall be indicated by
subscript numbers. Bit 1 shall indicate the least
significant bit; and
b) bits shall be transmitted octet by octet, starting with the
parameter id, and within each octet the rightmost bit (as
shown in the tables) shall be transmitted first.
Note 1.- The tables are divided into three major columns
that define the field name, the bit encoding and brief
explunarory notes.
Note 2.- Requirements for the use of the parameters
defined in the following sections are defined in 6.5.4.4.
6.5.4 VDL management entity
6.5.4.1 Services. The services of the VME shall be as
follows:
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.
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No. 75
Annex 10 - Aeronautical Telecommunications Volume Zl'l
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 layer subfield as defined in IS0
8885. The format identifier (hexadecimal 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
XD frames if other public parameters are not included.
Note.- IS0 8885 defines certain public parameters as
receive and transmit which are referred to herein as uplink and
downlink respectively.
6.5.4.2.2.1 HDLC public parameter set ident$er The
HDLC parameter setshall be identified by the IS0 IA5
character string "8885: 1993" encoded as per Table 6- 11. This
parameter shall be included whenever any of the public
parameters are sent. It shall be the first public parameter sent
as per IS0 8885.
6.5.4.2.2.2 Tuner T1 parameter: This parameter defines
the value of the downlink Timer T1 that an aircraft DLE shall
use. The values shall be defined in units of milliseconds for
Tlmin and Tlmax and in hundredths for Tlmult and Tlexp.
The timer values shall be encoded as 4 unsigned 16-bit
integers as per Table 6-12.
6.5.4.2.3 VDL private parmeters. 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 informution private
parameters. Both aircraft and ground-based LMEs shall use
general purpose information private parameters to transfer
basic information to each other.
6.5.4.2.4.1 VDL private parameter set identifier The
VIDL private parameter set identifier shall be the IS0 IA5
character capital 'V" encoded as per Table 6-14. This
parameter shall be included whenever my of the private
parameters are sent. It shall be the first private pararneter sent
as per IS0 8885.
6.5.4.2.4.2 Conr~ction 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 I,ME 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 pararnecer (SQP). This
parameter defines the received signal quality value of the last
received transmission from the destination of the XD. It shall
be encoded as a Cbit integer as per Table 6-18. If the
transmitting LhE included the SQP parameter in the
XII-CMD (P=l) frame, then the responding LME shall also
include it in the respective XID-RSP (F=l) 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 (rrrr). It shall be encoded as per Table 6-19.
An LME shall increment the sequence number for every new
XID (setting the retransmission field to 0 on the first
transmission) and shall increment the retransmission field after
every retransmission. In an XIDSP, 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 speciJic options parameter: This parameter
defines which AVLC protocol options are supported by
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