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from a received interrogation with format UF = 11 according to the procedure of 3.1.2.3.3.2 and 3.1.2.3.3.2.1. the address
shall be considered correct for Mode S-only all-call inlerroga~iona cceptance.
3.1.2.4.1.2.3.1.3 Broadcast address. To broadcast a message to all Mode S transponders within the interrogator beam,
a Mode S interrogation uplink format 20 or 21 shall be used and an address of twenty-four consecutive ONEs shall be
substituted for the aircraft address. If the UF code is 20 or 21 and lhis broadcast address is extracted from a received
interrogation according to the procedure of 3.1.2.3.3.2 and 3.1.2.3.3.2.1, the address shall be considered correct for Mode
S broadcast interrogation acceptance.
N o t e . Transponders associated with airborne collision avoidan.ce systems also accept a broadcast with UF = 16.
Chupter 3 Annex 10 - Aeronautical Telecommunicutiorzs
3.1.2.4.1.3 Transponder replies. Mode S transponders shall transmit the following reply types:
a) Mode A and Mode C replies; and
b) Mode S replics.
3.1.2.4.1.3.1 Mode A an.d Mode C replies. A Mode A (Mode C) reply shall be transmitted as specified in 3.1.1.6 when
a Mode A (Mode C) intcaogation has been accepted.
3.1.2.4.1.3.2 Mode S replies. Replies to other than Mode A and Mode C interrogations shall be Mode S replies.
3.1.2.4.1.3.2.1 Replies to intennode interrogations. A Mode S reply with downlink format 11 shall be transmitted in
accordance with thc provisions of 3.1.2.5.2.2 when a Mode A/C/S all-call interrogation has been accepted.
Note.- Since Mode S transponders do not accept Mode A/C-only all-call interrogations, no reply is generuted.
3.2.2.4.1.3.2.2 Replies to Mode S interrogations. The information content of a Modc S reply shall reflect the
conditions existing in thc transponder after completion of all processing of thc intcrrogution eliciting that reply. The
correspondence between uplink and downlink formats shall be as summarized in Table 3-5.
Note.- Four categories of Mode S replies may be transmitted in response to Modc S intermgations:
a) Mode S all-call replies (DF = 11);
b) surveillance and standard-length communications replies (DF = 4, 5, 20 and 21);
c) extended length communications replies (DF = 24); and
d) air-air surveillunae replies (DF = 0 und 16).
Table 3-5. Interrogation - reply protocol summary
Interrogation Reply
UF Special conditions DF
0 RL (3.1.2.8.1.2) equals 0 0
RL (3.1.2.8.1.2) equals 1 16
4 KK (3.1.2.6.1.2) less than 16
RR (3.1.2.6.1.2) equal to or greater than 16
5 RR (3.1.2.6.1.2) less than 16
RR (3.1.2.6.1.2) equal to or greater than 16
11 Transponder locked out to interrogator code, IC (3.1.2.5.2.1.2)
Stochastic reply test fails (3.1.2.5.4)
Otherwise
20 RR (3.1.2.6.1.2) less than 16
RR (3.1.2.6.1.2) equal to or greater than 16
AP contains broadcast addrcss (3.1.2.4.1.2.3.1 -3)
2 1 RR (3.1.2.6.1.2) less than 16
RR (3.1.2.6.1.2) equal to or greater than 16
AP contains broadcast address (3.1.2.4.1.2.3.1.3)
24 RC (3.1.2.7.1.1) equals 0 or 1
RC (3.1.2.7.1.1) equals 2 or 3
No reply
No reply
11
4
20
No reply
5
2 1
No reply
No reply
24

Chapter 3 Annex 10 - Aeronautical Telecommunications
3.1.2.5.2.1 Mode S-only all-call interrogation, uplir1.k formal I1
The format of this interrogation shall consist of these fields:
Field Reference
UF uplink format 3.1.2.3.2.1.1
PR probability of reply 3.1.2.5.2.1.1
IC interrogator code 3.1.2.5.2.1.2
CL code label 3.1.2.5.2.1.3
spare - 16 bits
AP addresslparity 3.1.2.3.2.1.3
3.1.2.5.2.1.1 PR: Probability of reply. This 4-bit (6-9) upliilk ficld shall contail1 commands to h e transponder
specifying the probability of reply to that interrogation (3.1.2.5.4). Codes are as follows:
signifies reply with probability of 1
signifies reply with probability of 112
signifies reply with probability of 114
signifies reply with probability of 118
signifies reply with probability of 1/16
not assigned
signifies disregard locko~itr, eply with prohability nf 1
signifies disregard lockout, reply with probability OF 112
signifies disregard lockout, reply with probability OF 114
signifies disregard lockout, reply with roba ability of 118
signifies disregard lockout, rcply with probability of 1/16
not assigned.
3.1.2.5.2.1.2 IC: Interrogator code. This 4-bit (10-13) uplink field s11all con lair^ eilhe~11 1t: 4-bit interrogator idenlific~
code (3.1.2.5.2.1.2.3) or the lower 4 bits of lhe 6-bit surveillance identifier code (3.1.2.5.2. I .2.4) depending on the value
of the CL ficld (3.1.2.5.2.1.3).
3.1.2.5.2.1.2.1 Recommendation.- It is recommended that whenever possible an interrogator slznuld operate using
　
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