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segment contained in MC (3.1.2.7.4.2.1). NC shall bc coded as a binary number.
3.1.2.7.1.3 MC: Message, Comm-C. This 80-bit (9-88) uplink field shall contain:
a) one of the segments of a sequence used to transmit an uplink ELM to the transponder containing the 4-bit (9-12)
IIS subfield; or
b) control codes for a downlink ELM, the 16-bit (9-24) SRS subfield (3.1.2.7.7.2.1) and the 4-bit (25-28) IIS subfield.
Note.- Message content and codes are not included in this chapter except for 3.1.2.7.7.2.1.
Note.- Interrogation-reply coordination for the above format follows the protocol outli~zcd in Table 3-5
(3.1.2.4.1.3.2.2).
3.1.2.7.3 COMM-DD, OWNLINK FORMAT 24
1 4 5 9 89
The format of this reply shall consist of these fields:
Field Reference
DF downlink format 3.1.2,3.2.2.2
spare - 1 bit
KE control. ELM 3.1.2.7.3.1
ND number of D-segment 3.1.2.7.3.2
MD messagc, Comm-D 3.1.2.7.3.3
AP addresslparity 3.1.2.3.2.1.3
3.1.2.7.3.1 KE: Control, ELM. This 1-bit (4) downlink field shall defme the content of the ND and MD fields.
Coding
KE = 0 signifies downlink ELM transmission
1 signifies uplink ELM acknowledgement
3.1.2.7.3.2 ND: N~imber of D-segment. This Cbit (5-8) downlink field shall designate the number of the message
segment contained in MD (3.1.2.7.7.2). ND shall be coded as a binary number.
3.1.2.7.3.3 MD: Message, Comm-D. This 80-bit (9-88) downlink field shall contain:
a) one of the segments of a sequence used to transmit a downlink ELM to the interrogator: or
b) control codes tor an uplink ELM.
Annex 10 - Aeronautical Telecommunications Volume IV
3.1.2.7.4 MULTTSITE UPLINK ELM PROTOCOL
3.1.2.7.4.1 Multisite uplink ELM reservation. An interrogator shall request a reservation for an uplink ELM by
transmitting a surveillance or Comm-A interrogation containing:
DI = 1
IIS = assigned interrogator identifier
MES = 1 or 5 (uplink ELM reservation request)
Note.- A mulrisite uplink ELM reservation request is normally accompanied by an uplink ELM reservation status
request (RSS = 2). This causes the interrogator identifier of the reserved site to be inserted in the UMfield of the reply.
3.1.2.7.4.1.1 Protocol procedure in response to this interrogation shall depend upon the state of the C-timer which
indicates if an uplink ELM reservation is active. This timer shall run for TR seconds.
Note 1.- The value of TR is given in 3.1.2.10.3.9.
a) If the C-timer is not running the transponder shall grant a reservation to the requesting interrogator by:
1) storing the IIS of the interrogation as the Comm-C I1 and,
2) starting the C-timcr.
b) If the C-timer is running and the IIS of the interrogation equals the Comm-C II, the transponder shall reshrt the Ctimer.
c) If the C-timer is running and the IIS of the interrogation does not equal the Comm-C II, there shall be no change
to the Cornm-C TI or the C-timer.
Note 2.- In case c) tlzc reservution request has been denied.
3.1.2.7.4.1.2 An interrogator shall not start ELM activity unless, during the same scan, having requested an uplink
ELM status report, it has received its own interrogator identifier as the reserved interrogator for uplink ELM in the UM
field.
Note.- lf ELM activity is not started during the same scan as the reservation, a new reservation request may be made
during the next scan.
3.1.2.7.4.1.3 Xf uplink ELM delivery is not completed on the current scan, the interrogator shall ensure that it still
has a reservation before delivexing additional segments on a subsequent scan.
3.1.2.7.4.2 Multisite uplink ELM delively. The minimum length of an uplink ELM shall be 2 segments, the maximum
length shall be 16 segments.
3.1.2.7.4.2.1 initial segment transfer The interrogator shall begin the ELM uplink delivery for an n-segment mcssage
(NC values from 0 to n-1) by a Comm-C transmission containing RC equals 0. The message segment transmitted in the
MC field shall be the last segment of the message and shall carry NC equals n-I.
On receipt of an initializing segment (RC = 0) the transponder shall establish a "setup" defined as:
a) clearing the number and content of previous segment storage registers and the associated TAS field;
b) assigning storage space for the number of segments announced in NC of this interrogation; and
c) storing the MC field of the segment received.
The transponder shall not reply to this interrogation.
Receipt of another initializing segment shall result in a new setup within the transponder
Chapter 3 Annex 10 - Aeronautical Telecommunications
3.1.2.7.4.2.2 nunsrnission ucknowledgement. The transponder shall use the TAS subfield to reporl the segments
received so far in an uplink ELM sequence. The information contained in the TAS subiield shall be conlinually updated
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