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Note.- The enhanced do,vnlink ELM protocol provides a higher data link capacity by permitting parallel delively of
downlink ELM messuges by up to sixteen interrogators, one for each II code. Operation without the need for muhisite
downlink ELM reservations is possible in regions of overlapping coverage for interrogators equipped for the enhanced
downlink ELM protocol. The protocol is fully confonnant to the standard multisite protocol and thus is cornputible with
interrogators that are not equipped for the enhanced protocol.
3.1.2.7.9.1 General
3.1.2.7.9.1.1 The intcrrogator shall determine from the data link capability report wherher the transponder supports
the enhanced protocols. If the enhanced protocols are supported, downlink ELMs delivered using the multisile-directed
protocol may be delivered without a prior reservation. If the enhanced protocols are not supported by both the interrogator
and the transponder, the multisite reservation protocols specified in 3.1.2.6.11 shall be used for multisite and multisitedirected
downlink ELMs.
3.1.2.7.9.1.2 Recommendation.- If the transponder and the interrogator are equipped for the enhanced protocol,
the interrogator should use the enhanced downlink protocol.
3.1.2.7.9.2 Enhanced multisite downlink ELM protocol
3.1.2.7.9.2.1 The transponder shall be capable of storing a sixteen segmcnt message for each of the sixteen II codes.
3.1.2.7.9.2.2 Initialization. A multisite message input into the transponder shall be stored in the registers assigned
to I1 = 0.
3.1.2.7.9.2.3 Announcement and extraction. A waiting multisite downlink ELM message shall be announced in the
DR field of the replies to all interrogators for which a multisite directed downlink ELM message is not waiting. The UM
field of the announcement reply shall indicate thal the message is not reserved for any I1 code, i.e. the IIS subfield shall
be set to 0. When a command to reserve this message is received from a given interrogator, the message shall be reservcd
for the II code contained in the interrogation from that interrogator. After readout and until closeout, the message shall
continue to be assigned to that 11 code. Once a message is assigned to a specific 11 code, announcement of this message
shall no longer be made in the replies to interrogators with other TI codes. If the message is not closed out by the associated
interrogator for the period of the D-timer, the message shall revert back to multisite status and the process shall repeat.
Only one multisite downlink ELM message shdl be in process at a time.
3.1.2.7.9.2.4 Closeout. A closeout for a multisite message shall only be accepted from the interrogator that was
assigned most recently to transfer the message.
3.1.2.7.9.2.5 Announcement of the next message waiting. The DR field shall indicate a message waiting in the reply
to an interrogation containing a downlink ELM closeout if an unassigned multisite downlink ELM is waiting, or if a
multisite directed message is waiting for that I1 code (3.1.2.7.9.2).
3.1.2.7.9.3 Enhanced multisite directed downlink ELM protocol
3.1.2.7.9.3.1 Initialization. When a multisite directed message is input into the transponder, it shall bc placed in
the downlink ELM registers assigned to the II code specified for the message. If the registers for this I1 code are already
in use (i.e. a multisite directed downlink ELM message is already in process for this I1 code), the new message shall
be queued until the current transaction with that 11 code is closed out.
3.1.2.7.9.3.2 Announcement. Announcement of a downlink ELM message waiting transfer shall be made using the
DR field as specified in 3.1.2.7.7.1 with the destination interrogator TT code contained in the IIS subfield as specified in
3.1.2.6.5.3.2. The DR field and IIS subfield contents shall be set specifically for the interrogalor that is to receive the reply.
A waiting multisite directed message shall only be announced in the replies to the intendcd interrogalor. It shall not be
announced in replies to other interrogators.
Annex 10 - Aeronautical Teleco~nrnunications Volume IV
3.1.2.7.9.3.3 Delivery. An interrogator shall determine if it is the reserved site through coding in the UM field and,
il' so, it may procced to request dellvery of the downlink ELM. Thc delivery shall be performed as specified in 3.1 .?.7 7.2.
The transponder shall transmit the message containcd in the buffer associated with the LI code specified in the IIS subfield
of the segment request interrogation.
3.1.2.7.9.3.4 Closeout. Closeout shall be accomplished as specified in 3.1.2.7.7.3 except that a message closeout shall
only be accepted from 1he interrogaror with a I1 code equal to the one that transferred the message.
3.1.2.7.9.3.5 Anno~inccnent of the next message waiting. Tlle DR field shall indicate a messagc waiting in the reply
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