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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
shall 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 Emer T4 parameter: This parameter defines
the value of T~rnerT 4 (in minutes) thaL he aircraft DLEs shall
use. It shall be encoded as an unsigned 16-bit integer as per
Table 6-33.
6.5.4.2.6.4 MAC persistence parameter: Ths parameter
defines the value of the parameter p in the p-persistent CSMA
algorithm that an aircraft MAC shall use. This 8-bit integer
shall be encoded as hexadecimal 00 (= decimal 112561 to
hexadecimal FF (= decimal 256/256) as per Table 6-34.
6.5.4.2.6.5 Counter M1 parameter: This parameter defines
the value of M1 that an aircraft MAC shall use. It shall be
encoded as a 16-bit unsigned integer as per Table 6-35.
6.5.4.2.6.6 Timer TM2 parameter: Thls parameter defines
the value of Timer TM2 (in seconds) that an aircraft MAC
shall use. It shall be encoded as an 8-bit integer per Table 6-36.
6.5.4.2.6.7 Emer TG5 paramter This parameter defines
the value of Timer TG5 (in seconds) rhac the initiating and
responding LMEs shall use. It shall be encoded as two &bit
integers per Table 6-37.
6.5.4.2.6.8 T3min pammeter: This parameter defines the
value of T3min (in milliseconds) that an aircraft DEE shall
use. It shall be encoded as an unsigned 16-bit integer as per
Table 6-38.
6.5.4.2.6.9 Ground station address filter parameter: This
parameter defines thc DLS address of the ground station from
which links are handed-off. This parameter shall be sent in an
XKCMD and a receiving aircraft LlME shall process the
XID-CMD only if it has a link to the identified ground station.
The ground station address filter shall be encoded in a 32-bit
field as defined in Table 6-39.
6.5.4.2.6.10 Broadcast connection parameter: This
parameter defines a single aircraft's link attributes for a new
link, i.e.:
- aircraft address whose link was successfully established
on the new link (minimum information);
- an optional list of one or more subnetwork connections
maintained for that aircraft; and
- for each subnetwork connection listed, an indication of
whether its subnetwork dependent convergence facility
(SNDCF) context was maintained.
AS per Tables 6-40 and 6-41:
- the aircraft id subfield (a bits) shall be listed once and
shall be the aircraft address;
-the optional MII subfield (an bit) shall be the ShmCF
hUI bit in the CALL CONFlRMATION Call User Data
field; and
282M Y~UDO
No. 75
Annex 10 - Aeronautical Telecommunicatwns Volume III
-the optional LC1 subfield (1 bits) shall be the -logical
channel identifier of a subnetwork connection on the old
link which is to be maintained on the new link.
Any particular aircraft shall not appear in more than one
broadcast parameter block.
6.5.4.2.7 Ground-based initiated information private
parameters. A ground LME shall use ground-based initiated
information parameters to inform one or more aircraft LMEs
about that ground-based system's capabilities. Aircraft LMEs
shall not send these parameters.
6.5.4.2.7.1 Frequency suppott list. This parameter defines
the list of frequencies, modulation schemes .ad associated
ground stations supported in the coverage area of the
originating ground station. The parameter shall consist of a list
of 48-bit entries as shown in Table 6-42. The modulation
subfield (m bits) shall be encoded as defined in Table 6-26.
The frequency subfield (f bits) shall be encoded as:
Integer [(frequency in MHz * 100) - 100001
Note.- AS afi example, for abeguency of 131.725 MHz, the
encoded value is decimal value 31 72 or hexadecimal C64.
The ground station address (g bits) shall be the DLS address
encoded in a 32-bit field as defined in Table 6-42. The ground
DLS address shall be the DLS address of a ground station
which can provide services on the specified frequency and
modulation scheme. No association shall be made between the
operating parameters included in the transmitted XlD frame
and the operating parameters of the ground station(s) listed.
During frequency recovery the aircraft LME shall choose
randonlly a frequency from the list to re-acquire service.
6.5.4.2.7.2 Airport coverage indication parameter This
parameter defines a list of four-character airport identifiers of
airports for which the ground station can support
conimunication with aircraft on the ground. Each fourcharacter
　
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