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3.1.2.6.1 SORVEIUNCE, ALTITUDE REQUEST, UPWNK FORMAT 4
Thc format of this intcrroga~ions hall consis1 or these fields:
FieM r Reference
UF uplink format
PC protocol
RR reply request
DI designator identification
SD special designator
AP addresslparity
3.1.2.6.1.1 PC; Protocol. This 3-bit, (6-8) uplimk field shall contain operating comrnands to the transponder. The PC
field shall be ignored for the processing of surveillance or Comm-A inlcn-ogations containing DI = 3 (3.1.2.6.1.4.1).
Chapter 3 Annex 10 - Aeronautical Telecommunications
signifies no action
signifies non-selective all-call lockout (3.1.2.6.9.2)
not assigned
not assigned
signifies close our Comm-B (3.1.2.6.1 1.3.2.3)
signifies close out uplink ELM (3.1.2.7.4.2.8)
signifies close out downlink ELM (3.1.2.7.7.3)
not assigned.
3.1.2.6.1.2 RR: Reply request. This 5-bit, (9-13) uplink field shall command the length and content of a requested
reply.
The last four bits of the 5-bit RR code, transformed into their decimal equivalent, shall designate the BDSl code
(3.1.2.6.1 1.2 or 3.1.2.6.11.3) of the requested Comm-B message if the most significant bit (MSB) of the RR code is 1
(RR is equal to or greater than 16).
Coding
RR = 0-15 shall be used to request a reply with surveillance format (DF = 4 or 5);
RR = 16-31 shall be used to rcquest a rcply with Comm-B format (DF = 20 or 21);
RR = 16 shall be used to request transmission of an air-initiated Cornrn-B according to 3.1.2.6.11.3;
= 17 shall be used to request a data link capability report according to 3.1.2.6.10.2.2;
RR = 18 shall be used to request aircraft identification according to 3.1.2.9:
19-31 are not assigned in section 3.1.
Note.- Codes 19-31 are reserved for applications such as dutu link com~municutions, uirbome collision uvoidance
systerns (ACAS), etc.
3.1.2.6.1.3 Dl: Designator identification. This 3-bit (14-16) uplink field shall identify the structure of the SD field
(3.1.2.6.1.4).
Coding
0 signifies SD not assigned except for IIS
1 signifies SD contains multisite and communications control information
2 signifies SD contains control data for extended squitter
3 signifies SD contains SI multisite lockout, broadcast and GICB control information
4-6 signifies SD not assigned
7 signifies SD contains extended data readout request, multisite and communications control
information.
3.1.2.6.1.4 SD: Special designatox This 16-bit (17-32) uplink field shall contain control codes which depend on the
coding in the DI field.
Note.- The special designator (SD) field is provided to accomplish the transfer of rnultisite, lockout and
communications control information from the ground station to the transpondel:
Dl CODE SD FIELD STRUCTURE
17 21
0 IIS
llS MBS MES RSS TMS
-
LOS
Annex 10 - Aeronautical Telecommunications Volume IV
17 23 24 28
. .
3 7 LSS I RRS 1
22 27 32
17 21 24 27 29
2
3.1.2.6.1.4.1 Subfields in SD. The SD field shall contain information as follows:
IS
IIS, the 4-bit (17-20) interrogator identifier subfield shall contain an assigned identifier code of the interrogator
(3.1.2.5.2.1.2.3).
20 23 26 28 32
bits 21-32 are not assigned.
TCS SAS
RRS
MBS, the Zbit (21, 22) rnultisite Comm-B subfield shall have the following codes:
RCS
0 signifies no Comm-B action
LOS
1 signifies air-initiated Comm-B reservation request
(3.1.2.6.11.3.1)
2 signifies Comm-B closeout (3.1.2.6.11 .3.2.3)
3 not assigned.
TMS
MES, the 3-bit (23-25) multisite ELM subfield shall contain reservation and closeout commands for ELM as
follows:
0 signifies no ELM action
1 signifies uplink ELM reservation request (3.1.2.7.4.1)
2 signifies uplink ELM closeout (3.1.2.7.4.2.8)
3 signifies downlink EI.M reservation request (7 1 2.7.7.1.1)
4 signifies downlink ELM closeout (3.1.2.7.7.3)
5 signifies upl~nk ELM reservation request and downlink ELM closeout
6 signifies uplink ELM closeout and downlink ELM reservation request
7 signifies uplink ELM and downlink ELM closeouts.
RSS, the 2-bit (27, 28) reservation status subfield shall request the transponder to report its reservation status
in the UM field. The following codes have been assigned:
0 signifies no request
1 signifies report Comm-B reservation status in UM
2 signifies report uplink ELM reservation status in UM
3 signifies report downlink ELM reservation status in UM.
Chapter 3 Annex 10 - Aeronautical Teleco~n~nunications
LOS, the 1-bit (26) lockout subfield, if set to 1, shall signify a mdtisite lockout command from the interrogator
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