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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 pardmeter This parameter defines
the reason why the link connection request was refused. The
pararneter, 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 pararneters. 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 shd.1 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
XTD-CMD to that peer station for the duration of rime
designated in the LCR Causc parameter. An LME receiving an
LCR Cause parameter greater than 7F hex shall not transmit
another XID-CMD to that peer system for the duration of time
designated in the LCR Causc parameter.
Note.- An aircruji LME receiving u station-based cause
'code from one ground station nzay immediately transmit the
same XIRCMD to another ground station ofthe same ground
system.
6.5.4.2.5 Aircraft-initiated inforrnatiorz 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 suppo1-r pararneter: 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 parameter
This parameter defines a list of ground stations in order
of preference. This pararneter shall be a list of DLS addresses
encoded in 32-bit 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 airport parametel: This parameter
defines the aircrafts destination airport identifier. It shall
be encoded as four 8-bit IS0 IAS characters per Table 6-28.
6.5.4.2.5.4 Aircraft location pararneter 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 modification private
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 XTD with these parametcrs.
6.5.4.2.6.1 Autotune frequency parameter: 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 field as per Table 6-31.
The modulation subfield (m bits) shall be defined as per Table
6-32. The frequency subfield (f bits) shall be the frequency
encoded as:
Integer [(frequcncy in MHz * 100) - 10000J.
Note.- As an example. for a frequency of 131.725 MHz,
the encoded value is decimal 31 72 or hexadecimal C64.
6.5.4.2.6.2 Replacement ground station list. This
parameter defines a list of ground stations in order of ground
LME preference.This parameter shall be encoded as a list of
DLS addresses in 32-bit fields as per Table 6-32. These
addresses shalI be used by the aircraft LME during handoffs
as possible alternate ground stations if the proposed ground
station is not acceptable to the LME.
6.5.4.2.6.3 Timer T4 pararneter: This parameter defines
the value of Timer T4 (in minutes) that the aircraft DLEs shall
use. It shall be encoded as an unsigned 16-bit integer as per
Table 6-33.
Part I Annex 10 - Aeronautical Telecommunications
6.5.4.2.6.4 MAC persistence parameter: This parameter
defines the value of the pararneter p in the p-persistent CSMA
algorithm that an aircraft MAC shall use. This 8-bit integer
shall be encoded as hcxadecirnal 00 (= decimal 11256) to
hexadecimal EF (= decimal 2561256) as per Table 6-34.
6.5.4.2.6.5 Counter MI parameter. This parameter
defines the value of M1 that an aircraft MAC shall use. It
　
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