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shall transfer one or more Mode S ROUTE packets to
the ADLP. The update information contained in the
Mode S ROUTE packet shall be used by the ADLP to
modify its cross-reference table. Additions shall be
processed before deletions;
d) when the GDLP sends the initial ROUTE packet after
acquisition of a Mode S data link-equipped aircraft,
the IN bit shall be set to ONE. This value shall cause
the ADLP to perform the procedures as specified in
5.2.6.3.3.3. Otherwise, the IN bit shall be set to
ZERO;
e) when the ADLP is initialized (e.g. after a power-up
procedure), the ADLP shall issue a search requcst by
sending a broadcast Comm-B message with broadcast
identifier equal to 255 (FF,$, as specified in
Table 5-23) and the remaining 6 bytes unused. On
receipt of a search request, a GDLP shall respond with
one or more Mode S ROUTE packets, clear all SVCs
associated with the ADLP, as specified in 5.2.6.3.3,
and discard the search rcquest. This shall cause the
ADLP to initialize the I1 code-DTE cross-reference
table; and
f) on receipt of an update request (Table 5-23), a GDLP
shall respond with one or more Mode S ROUTE
packets and discard the update request. This shall
cause the ADLP to update the I1 code-DTE
cross-reference table.
Note.- The update request may be used by the ADLP
under exceptional circumstances (e.g. changeover to standby
unit) to verifi the contents of its If code-DTE cross-reference
table.
5/11/98
No. 73
Part I Annex 10 - Aeronautical Telecommunications
5.2.8.1.3 PROCEDUREFSO R DOWNLINKING
MODE S PACKETS
5.2+8.1.3.1 When the ADLP has a packet to downlink,
the following procedures shall apply:
a) CALL REQUEST packet. If the packet to be transferred
is a Mode S CALL REQUEST, the ground
DTE address field shall be examined and shall be
associated with a connected Mode S interrogator using
the II code-DTE cross-rtference table. The packet shall
be downlinked using the rnultisite-directed protocol. A
request to transfer a packet to a DTE address not in
the cross-reference table shall result in the action
specified in 5.2.6.3.3.1.
b) Other SVC packets. For an SVC, a request to send a
packet to a ground DTE shall cause the packet to be
multisite-directed to the last Mode S interrogator used
to successfully transfer (uplink or downlink) a packet
to that DTE, provided that this Mode S interrogator is
currently in the IJ code-DTE cross-reference table.
Otherwise, an SVC packet shall be downlinkcd using
the multisite-directed protocol to any other Mode S
interrogator associated with the specified ground DTE
address.
Level 5 transponders shall be permitted to use additional
interrogators for downlink transfer as indicated in the I1 code-
DTE cross-reference table.
5.2.8.1.3.2 A downlink frame transfer shall be defined
to be successful if its Comrn-B or ELM close-out is received
from the transponder within Tz seconds as specified in
Table 5-1. If the attempt is not successful and an SVC packet
is to be sent, the I1 code-DTE cross-reference table shall be
examined for another entry with the same called ground DTE
address and a different Mode S I1 code. The procedure shall
be retried using the multisite-directed protocol with the new
Mode S interrogator. If there are no entries for the required
called DTE, or all entries result in a failed attempt, a link
failure shall be declared (5.2.8.3.1).
5.2.8.2 SUPFORTF OR THE DTE(s)
5.2.8.2.1 GDLP connectivity reporting. The GDLP shall
notify the ground DTE(s) of the availability of a Mode $ data
link-equipped aircraft ("join event"). The GDLP shall also
inform the ground DTEs when such an aircraft is no longer in
contact via that GDLP ("leave event"). The GDLP shall
provide for notification (on request) of all Mode S data linkequipped
aircraft currently in contact with that GDLP. The
notifications shall provide the ground ATN router with the
subnetwork point of attachment (SNPA) address of the mobile
ATN router, with the position of the aircraft and quality of
service as optional parameters. The SNPA of the mobile ATN
router shall be -the DTE address formed by the aircraft address
and a sub-address of 0 (5.2.3.1.3.2).
5.2.8.2.2 ADLP cortnectivity reporting. The ADLP shall
notify all aircraft DTEs whenever the last remaining entry for
a ground DTE is delctcd from the I1 code-DTE cross-reference
table (5.2.8.1.1). This notification shall include the address of
this DTE.
5.2.8.2.3. Cornntunications requirements. The mechanism
for communication of changes in subnetwork connectivity
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