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necessary; and
5.2.7.3.1.5 User data (UD). The user data field shall
contain message data received From the Mode S specific Note.- Truncation of the user data field is a condition
services interface (5.2.3.2.2). that canrzot be reported.
5.2.7.3.2 Long form MSP packet. The format for this e) if an error is detected in the processing of an MSP
packet shall be as follows: packet, the packet shall be discarded.
5.2.7.4.2 In the processing of an L-bit sequence, the
XDLP shall discard any MSP packets that have duplicate
M/SN values. The XDLP shall discard the entire L-bit
Fields shown in the packet fomat and not specified in the Sequence if a long fo* hlSP packet is determined to be
following paragraphs shall be set as specified in 5.2.5.2.1 and missing by use the
5.2.7.3.1.
5.2.7.4.3 The packets associated with any L-bit sequence
5.2.7-3.3 D~~~ type ( ~ p ) h.i ^ field ,.hall be set whose reassembly is not completed in Tm seconds (Tables 5-1
to 0. and 5-1 3) shall be discarded.
5.2.7.3.3.1 MSPpacket type (MP). This field shall be set
to 1.
5.2.7.5 Broadcast format. The first byte of the 7-byte
broadcast message shall contain the broadcast identifier as
specified in Table 5-23.
5.2.7.3.3.2 Supervisory packet (SP). This field shall be
set to 0.
5.2.8 Mode S subnetwork management
5.2.7.3.3.3 L fzeld (L). A value of 1 shall indicate that
the packet is part of an L-bit sequence with more packets in
the sequence to follow. A value of 0 shall indicate that the
sequence ends with this packet.
5.2.7.3.3.4 MSP sequence number $eld (M/SN). This
field shall be used to detect duplication in the delivery of L-bit
5.2.8.1 INTERROGATLOINRK DETERMINATION FUNCTION
Note.- The ADLP interrogator link determinationfunction
selects the II code of the Mode S interrogator through which
a Mode S subnetwork packet may be routed to the desired
destination ground DTE.
71111Y6
No. 71
Annex 10 - Aeronautical Telecommunications Volume IZZ
5.2.8.1.1 I1 code-DTE address correlation. The ADLP
shall construct and manage a Mode S interrogator-data
terminal equipment (DTE) cross-reference table whose entries
are Mode S interrogator identifier (11) codes and ground DTE
addresses associated with the ground ATN routers or other
ground DTEs. Each entry of the 11 code-DTE cross-refercncc
table shall consist of the bbit Mode S 11 code and the 8-bit
bin<uy representation of the ground DTE.
Note 1.- Due to, the requirement for non-ambiguous
addresses, a DTE address also uniquely identifies a GDLP
Nore 2.- An ATN router may have more than one ground
DTE address.
5.2.8.1.2 Protocol. The following procedures shall be
used:
a) CAI,[, REQUEST packet. I f the packet to be transferred
is a Mode S CALL REQUEST, the ground
DTE address field shall be examined and shall be
associated with a connected Mode S interrogator using
the I1 code-DTE cross-reference table. The packe-t shall
be downlinked using the multisite-directed protocol. A
request to transfer a packet to a DTE address not in
the cross-refcrcnce table shall result in the action
spccified in 5.2.6.3.3.1.
b) Other SVC packets. For an SVC, a request to send a
packet to a ground DTE shall cause the packet to be
multisite-directed to the last Mode S interrogator used
to successfully transfer (uplink or downlink) a packet
to that DTE, provided that this Mode S interrogator is
currently in the I1 code-DTE cross-reference table.
Otherwise, an SVC packet shall be downlinked using
a) when the GDLP initially detects the presence of a data the multisite-directed protocol to any other Mode S
link equipped aircraft, or detects contact with a interrogator associated with the specified ground DTE
currently acquired aircraft through an interrogator with address.
a new fi cohe, the GDLP shall uplink one or more
Mode S ROUTE packets as specified in 5.2.5.3.3. This Level- 5 transponders shall be permitted to use additional
information shall relate the Mode S interrogator interrogators for downlink transfer as indicated in the Il codeidentifier
(11) code with the ground DTE addresses DTE cross-reference
accessible through that interrogator. The ADLP shall
update the 11 code-DTE cross-reference table and then
discard the Mode S ROUTE packet(s);
b) a II code-DTE cross-reference table entry shall be
deleted when commanded by a Mode S ROUTE
packet or when the ADLP recognizes that the transponder
has not been sclectivcly interrogated by a
Mode S interrogator with a gven I1 code for Ts
seconds by monitoring the IIS subfield in Mode S
surveillance or Comm-A interrogations (Table 5-1);
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