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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 arc included in an XID, the bit values
for those options which are included in both parameters shall
be determined by the Connection Management parameter.
6.5.4.2.4.6 Expedited subnetwork connection parametel:
This parameter defrnes the expedited packets that the current
XTD contains. This parameter, which may be repeated, shall
contain one and only one of the following subnetwork packets:
CALL REQUEST, CALL CONFKMATION, or a CLEAR
REQUEST. It shall be encoded as Table 6-22. The inclusion of
this parameter shall invoke the expedited subnetwork
connection procedures. This parameter shall only be included
if the ground LME indicates that it supports expediting
subnetwork connections. If, during link establishment, an
aircraft LME has not received a ground station information
frame (GSIF), it may assume expedited subnetwork
connection is supported.
6.5.4.2.4.7 LCR cause parameter This parameter defines
the reason why the link connection request was refused. The
parameter, which may be repeated, shall consist of a rejection
cause code (c bits), backoff delay time in seconds (d bits), and
any additional data required by the various parameters. It is
encoded as per Table 6-23. Cause codes 00 hex to 7F hex shall
apply to the responding station; cause codes 80 hex to FF hex
shall apply to the responding system and shall be encoded as
per Table 6-24. At least one copy of this parameter shall be
included whenever the "r" bit in the Connection Management
parameter is set to 1; this parameter shall not be included if the
"r" bit is set to 0. An LME receiving an LCR Cause parameter
less than 80 hex shall not transmit another XLD-CMD to that
peer station for the duration of time designated in the LCR
Cause pararneler. An LME receiving an LCR Cause parameter
greater than 7F hex shall not transmit anothcr XID-CMD to
that peer system for the duration of time desigr-ated in the LCR
Cause parameter.
2/11/00
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No. 75
Part Z Annex 10 - Aeroonarrfical Telecornmunicafions
Note.- An airrmfr LME receiving a station-based cause
code fmm one ground station may immediately trcn~mit the
same XID-CMD to another gmund station of the same ground
svstem.
6.5.4.2.5 Aircraft-initiated information. private parameters.
An aircraft LME shall use aircraft-initiated
information parameters to inform the ground about that
aircraft's capabilities or desires. Ground LMEs shall not send
these parameters.
6.5.4.2.5.1 Modulation support parameter This parameter
defines the modulation schemes supported. This parameter
shall be sent on link establishment. It shall be encoded as
shown in Tables 6-25 and 6-26.
6.5.4.2.5.2 Acceptable alternate ground station parumeter
This parameter defines a list of ground stations in order
of preference. Tki.s parameter shall be a list of DLS addresses
encoded in 32-bjt fields as per Table 6-27. These shall be used
by the ground LME during handoffs as possible alternate
ground stations, if the proposed ground station is not
acceptable to the ground LME.
6.5.4.2.5.3 Destination ailport parameter This parameter
defines the aircrafts destination airport identifier. It shall be
encoded as four 8-bit IS0 IA5 characters per Table 6-28.
6.5.4.2.5.4 Aircraft location parametel: This parameter
defines the current position of the aircraft. It shall be encoded
as shown in Tables 6-29 and 6-30.
6.5.4.2.6 Ground- bused initiated rnodry'ication pn'vure
parameters. A ground LME shall use the ground-based
initiated modification parameters to change the value of
various parameters in one or more aircraft. Aircraft LMEs
shall not send an XID with these parameters.
6.5.4.2.6.1 Autotune frequen~y paammeter This parameter
defines the frequency and modulation scheme that an aircraft
LME shall use to reply to a ground station listed in the
replacement ground station parameter. This parameter shall be
sent by a ground LME when an autotune is required. The
parameter shall be encoded as a 16-bit tield as per Table 6-31.
The modulation subfield (m bits) shall be defined as per
Table6-32. The frequency subfield (f bits) shall be the
frequency encoded as:
Integer [(frequency in MHz * 100) - 100001.
Note.-As an example, for a frequency of 131.725 MHz, the
encoded value is decimal 3172 or hexadecimal C64.
6.5.4.2.6.2 Replacement ground station list. This parameter
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