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remainder of the Broadcast Connection parameter to determine
which subnetwork connections the ground LME maintained.
For those subnetwork connections associated with the logical
channels on the old link that the ground LME maintained, the
aircraft DTE shall consider as if the CALL REQUEST and
CALL CONFIRMATION sent on the old link were resent on
the new link (except that the Mn bit in the Broadcast
Connection parameter shall supersede the value in the previous
CALL CONFIRMATION). At this point the aircraft DTE,
ground DCE, and ground DTE shall be initialized. If the
Broadcast Connection parameter indicates that the ground was
not able to maintain a subnetwork connection (i.e. a particular
LC1 is not mentioned in the Broadcast Connection parameter),
the aircraft shall explicitly establish this subnetwork
connection as per 6.6.6.3.3.1.
6.5.4.4.10.3 Exceptional cases. If thc aircraft LME does
not support broadcast recovcry, but the ground LME
pesforrned a broadcast link recovery for it, then the aircraft
LME shall perform either an air-initiated link handorf, (if the
aircraft LME supports same) or request a link handoff. If the
aircraft LME finds the new ground station unacceptable, it
shall perform an air-initiated handoff (if the aircraft LME
supports same) or request a link handoff. If the Ground Statton
Address Ftlter parameter does not cqual the DLS address of a
link that the aircraft LME has or if no aircraft identifier
subfield tn a Broadcast Connection parameter equals its
aircraft address, the aircraft LME shall not process the ground
requested broadcast handoff. If ~ h cm rcrdt LME supports
broadcast link handoffs but does not support broadcast
subnetwork connection management and the Broadcast
Connection field is implemented as per Table 6-41, the aircraft
LME shall explicitly establish its subnetwork conncctions. If
the Broadcast Connection parameler indicates that a
subnetwork connection was maintained, but the aircraft LME
does not recognize thal subnetwork connection, then the
aircraft DTE shall transmit a CLEAR REQUEST for each
unrecognized subnetwork connection.
6.5.4.4.11 Ground-based commanded autotune. This
section sunirnarizes the autotune details found in 6.5.4.4.3,
6.5.4.4.5, and 6.5.4.4.8.
6.5.4.4.11 .I. Ground action. To command an aircraft
LME to irandoff to a ground station on a different frequency,
the ground LME shall include the Autotune and Replacement
Ground Station Lis~pa rameters in an XID it sends during a
link establishment or handoff procedure.
6.5.4.4.1 1.2 General aircraft response. On receipt of an
XID cornmanding an autotune, the aircraft LME shall retunc
the aircraft radio to the new frequency and commence an
aircraft-initiated handoff to the chosen ground station.
6.5.4.4.11.3 Exceptional cases. If the aircraft LME
cannot perform the autotune, it shall transmit an
XID-CMD-LCR (P=O); the current link shall not be affected.
6.5.4.4.12 Expedited subnetwork connection management.
If a LME implements this section, then it shall set the
"v" bit in both the AVLC Specific Options and in the Connection
Management parameters to 1; otherwise it shall set them
to 0. Thjs section shall only be applicable for the link
establishment, air initiated handoff, and ground initiated
handoff processes.
6.5.4.4.12.1 Initiating station of subnetwork connection
management. To perform an expedited subnetwork connection
establishm~not r maintenance, the initiating LME shall include
in the XU-CMD the Expedited Subnetwork Connection parameter
for each subnetwork connection that needs to be established
or maintained. The procedures for an expedited link
establishment and maintenance shall be the same as outlined
in 6.5.4.4.4, 6.5.4.4.6 and 6.5.4.4.8.
6.5.4.4.12.2 General responder action. If the responding
LME receives a XID-CMD with one or more Expedited
Subnetwork Connection parameters, it shall confirm
subnetwork connection establishment or maintenance by
sending an XIDRSP containing the pararncters as per Table
Part I Avinex 10 - Aeronautical Telecommunications
6-51. The respoilding LME shall attempt to establish or
maintain the specified subnetwork connections as outlined in
6.6.6.3. The responding LME shall include in the XID-RSP
the CALL CONFIRMATION or CLEAR REQUEST
responses (i.c. in the Expedited Subnetwork Connection
parameter) and any optional pararnctcrs for which it is not
using the default values. The ground LME shall not process
the Expedited Subnetwork Conneclion parameters if it includes
the Autotune parameter in the XID-RSP.
　
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