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to an interrogation containing a downlink ELM closeout if another multisite directed message is waiting for that IT code,
nr if a downlink message is waiting that has not been assigned a II code (3.1.2.7.9.2).
3.1.2.7.9.4 Enhanced non.-selective downlink ELM protocol. The availability of a non-selective downlink ELM
message shall be announced to all interrogators. Otherwise, the protocol shall be as specified in 3.1.2.7.7.
3.1.2.8 AIR-AIR SERVICE AND SQUITTER TRANSACTIONS
Note.- Airborne collision avoidance system (ACAS) equipment uses the formats UF or DF equals 0 or 16 for air-air
sur veillunce.
3.1.2.8.1 SHORT AIR-AIR SURVEILLANCE, UPLINK FORMAT 0
The format of this interrogation shall consist of these ficlds:
Field Reference
UF uplink format
spare - 3 bits
RL reply length
spare - 4 bits
AQ acquisition
DS data selector
spare - 10 bits
AP addresslparity
3.1.2.8.1.1 AQ: Acquisition. This 1-bit (14) uplink field shall contain a code which controls the content of the RI field.
3.1.2.8.1.2 RL: Reply length. This 1-bit (9) uplink field shall command the format to be used for the reply.
Coding
0 signifies a reply with DF - 0
1 signifies no reply
Note.- A trunsponder associuted with airborne collision uvoidance equipment would reply with DF equals 16 in
response to an interrogution with RL equals I .
3.1.2.8.1.3 DS: Data sekctor: This 8-bit (15-22) uplink Field shall contain the BDS code (3.1.2.6.1 1.2.1) of thc GICB
register whose contents shall be returned to the corresponding reply with DF equals 16.
Chapter 3 Annex I0 - Aeronautical Telecommunications
This reply shall be sent in response to an interrogation with UF equals 0 and RL equals 0. The format of this reply shall
consist of these fields:
Field Reference
DF downlink format
VS vertical status
CC cross-link capability
spare - 6 bits
RI reply information
spare - 2 bits
AC altitude code
AP addresslpatity
3.1.2.8.2.1 VS: Vertical status: This 1-bit (6) downlink field shall indicate the status of the aircraft (3.1.2.6.10.1.2).
Coding
0 signifies that the aircraft is airborne
1 signifies that the aircraft is on the ground
3.1.2.8.2.2 RI: Reply information, air-air: This 4-bit (14-17) downlink field shall report the aircraft's maximum
cruising true airspeed capability and type of reply to interrogating aircraft. The coding shall be as follows:
signifies a reply to an air-air interrogation UF = 0 with AQ = 0, no operating ACAS
reserved for ACAS
signifies a reply to an air-air interrogation UF = 0 with AQ = 1 and that the maximum airspeed
is as follows:
no maximum airspeed data available
maximum airspeed is .LE. 140 kmh (75 kt)
maximum airspeed is .GT. 140 and .LE. 280 km/h (75 and 150 kt)
maximum airspeed is .GT. 280 and .LE. 560 kmlh (150 and 300 kt)
maximum airspeed is .GT. 560 and .LE. 1 110 km/h (300 and 600 kt)
maximum airspeed is .GT. 1 110 and .LE. 2 220 kmlh (600 and 1 200 kt)
maximum airspeed is more than 2 220 km/h (1 200 kt)
not assigned.
Note.- ".LE." means "less than or equal to" and ".GTr' means "greater than".
3.1.2.8.2.3 CC; Cross-link capability. This 1-bit (7) downlink field shall indicate the ability of the transponder to
support the cross-link capability, i.e. decode the contents of the DS field in an interrogation with UF equals 0 and respond
with the contents of the specified GICB register in the corresponding reply with DF equals 16.
Coding
0 signifies that the transponder cannot support the cross-link capability
1 signifies that the transponder supports the cross-link capability.
Annex 10 - Aerorzautical Telecommunications Volume IV
3.1.2.8.3 LONG AIR-AIR SURVEILLANCE, DOWNLINK FORMAT 16
This reply shall be sent in response to an interrogation with UF equals 0 and RL equals 1. The format of this reply shall
consist oS these fields;
Field Reference
DF downlink format
VS vertical status
spare - 7 bits
RI reply information
spare - 2 bits
AC altitudc code
MV message, ACAS
AP address/parity
3.1.2.8.3.1 MV: Message, ACAS. This 56-bit (33-88) downlink field shall contain GICB information as requested in
the DS field of the UF 0 interrogation that elicited the reply.
Note.- The MVfield is also used by ACAS for air-air coordination (4.3.8.4.2.4).
3.1.2.8.4 AIR-AIR TRANSACTION PROTOCOL
Note.- Interrogation-reply coordination for the uir-air formats follows the protocol outlined in Table 3-5
(3.1.2.4.1.3.2.2).
Tlie most significant bit (bit 14) of the lU field of an air-air reply shall replicate the value of the AQ field (bit 14) received
in an interrogation with UF equals 0.
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