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shall be encodcd as a 16-bit unsigned integer as per Table
6-35.
6.5.4.2.6.6 Timer TM2 parameter: This parameter
detines the value of Timer TM2 (in seconds) that an aircraft
MAC shall use. It shall be encoded as an %bit intege,r per
Table 6-36.
6.5.4.2.6.7 Emer TG5 parameter: This pararneter
defines the value of Timer TG5 (in seconds) that the initiating
and responding LMEs shall use. It shall be encoded as two 8-
bit integers per Table 6-37.
6.5.4.2.6.8 T3min parameter: This parameter defines the
value of T3min (in milliseconds) that an aircraft DLE 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#lterparameter: This
parameter defines the DLS address of the ground station from
which links are handed-off. This parameter shall be sent in an
XID-CMD and a receiving aircraft LME shall process the
XID-CMD only if it has a link to the identified ground
station. The grollnd station address filter shall be encoded in
a 32-bit field as defincd in Table 6-39.
6.5.4.2.6.10 Bmadcast con~zectioh 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 lhat 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 MI1: subfield (m bit) shall be the SNDCF
Mil bit in the CALL CONFIRMATION Call User
Data field; and
- 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 pararneter 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 support list. This pararneter
defines the list of frequencies, modulation schemes and
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 an example, for a frequency 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 XID frame
and the operating parameters of the ground station(s) listed.
During frequency recovery the aircraft LME shall choose
randomly a frequency from the list to re-acquire service.
6.5.4.2.7.2 Ailport coverage indication parameter This
parameter defines a list of four-character airport identifiers of
airports for which the ground station can support
communication with aircraft on the ground. Each fourcharacter
identifier shall be encoded as four 8-bit IS0 M
characters as per Table 6-43.
6.5.4.2.7.3 Nearest airport parameter: This parameter
defines the four-character airport ID of the airport nearest the
ground station. It shall be encoded as four 8-bit IS0 IA5
characters as per Table 6-44. The nearest airport parameter
shall not be included in an XID if the Airport Coverage
indication is included.
6.5.4.2.7.4 ATN router NETS parameter. This parameter
defines a list of ATN air-ground routers identified by the
"adminismation identifier" (ADM) and "administration region
selector" (ARS) subfields of their network entity titles (NETS).
It shall be encoded as per Table 6-45.
6.5.4.2.7.5 Gmund-based system mask parameter: This
parameter defines the ground-based system mask. It shall be
encoded as a 27-bit mask in a 32-bit field as per Table 6-46.
6.5.4.2.7.6 limer TG3 parumeter. This pumeter
defines thc value of Timer TG3 (in half-seconds) that the
　
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