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in 5.2.6.3.3.3. Otherwise, the W 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 request by
sending a broadcast Comm-B message with broadcast
identifier equal to 255 (FFI6, 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 request. This shall cause the
ADLP to initialize the I1 code-DTE cross-reference
table; and
f ) on rcceipt 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.
N o t e . The update request may be used by the ADLP
under exceprion,al circumstances (e.g changeover to standby
unit) to vertfi the contents of its II code-DTE cross-reference
table.
5.2.8.1.3 PROCEDURFOERS D O WNLINKING
MODE S PACKETS
5.2.8.1.3.1 When the ADLP has a packet to downlink,
the fullowing procedures shall apply:
a) CALL REQUESTpacket. 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 I1 code-DTE
cross-refercncc [able. The packet shall be downlinked
using the multisite-directed prolocol. A request to
Part I Annex 10 - Aeronautical P'elecommunicaiwrzs
transfer a packet to a DTE address no1 in the crossreference
table shall result in the action specified in
5.2.6.3.3.1.
b) Orher SVC packets. For an SVC, a rcqucst to send a
packet to a ground DTE shall cause the packet to be
multisite-directed to the last Mode S interrogator used to
successl'ully transfer (uplink or downlink) a packet to
that DTE, provided that this Mode S interrogator is
currently in the II code-DTE cross-reference table.
Otherwise, an SVC packet shall be downlinked using the
niultisite-directed protocol to any other Mode S
interrogator associated with the specified ground DTE
address.
Lcvcl 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 Cornrn-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 bc 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 II code. The procedure shall be
retried using the multisite-directed protocol with the new
Mode S interrogator. If there arc no entries for the required
callcd DTE, or all entries result in a failed attempt, a link
failure shall be declared (5.2.8.3.1).
5.2.8.2 SUPPORT FOR THE DTE(S)
5.2.8.2.1 GDLP cont~ectivity reporting. The GDLP shall
notify the ground DTE(s) of h e availability of a Mode S 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 GDEP ("leave event"). The GDLP shall
provide for notification (on requesl) 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 h e position of the aircraft and quality of
scrvice 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 cont1ectivil)i reporting. The ADLP shall
notify a11 aircraft DTEs whenever the last remaining entry lor
a ground DTE is dclcted Crom the 11 code-DTE cross-reference
table (5.2.8.1.1). This notification shall include the address of
this DTE.
5.2.8.2.3 Commz~nications requirements. The mechanism
for communication of changes in subnetwork connectivily
shall be a confilmed service, such as the jointleave events that
allow notification of the connectivity status.
5.2.8.3 ERRORPR OCEDUKES
5.2.8.3.1 Link ,failure. The failure to deliver a packet la
the referenced XDLP after an atlempf. has been made lo deliver
this packet via all available interrogators shall be declared to
be a link level failure. For an SVC, the XDCE shall enter the
statc pl, and release all resources associated with that channel.
　
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