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the interrogator that transmitted the frame. ADLP frame
processing shall transfer to the transponder the II code of the
interrogator or cluster of interrogators that shall receive a
multisite-directed frame.
5.2.2.5.4 Mode S protocol type ident$cation. ADLP
frame processing shall indicate to the transponder the protocol
to be used to transfer the frame: ground-initiated, air-initiated,
broadcast, multisite-directed, standard length or extended
length.
5.2.2.5.5 Frame cancellation. ADLP frame processing
shall be capable of cancelling downlink frames previously
transfcrrcd to the transponder for transmission but for which
a close-out has not been indicated. If more than one frame is
stored within the transponder, the cancellation procedure shall
be capable of cancelling the stored frames selectively.
5.2.2.5.6 Frame determination. A Mode S packet (including
multiplexed packets but excluding MSP packets) intended
for downlink and less than or equal to 222 bits shall be sent
as an SLM frame. A Mode S packet greater than 222 bits shall
be sent as a downlink ELM frame for transponders with ELM
capability using M-bit processing as necessary (5.2.5.1.4.1). 1l
the transponder does not have ELM capability, packets greater
than 222 bits shall be sent using the M-bit or S-bit
(5.2.5.1.4.2) assembly procedures and multiple SLM frames.
Note.- The maximum length of a downlink SLM frame is
222 bits. This is equal to 28 bytes (7 bytes for 4 Comm-B
segments) minus the 2-bit linked Comm-B subfield
(5.2.2.2.1.1).
5.2.2.6 PRIORITY MANAGEMENT
5.2.2.6.1 ADLP priority management. Frames shall be
transferred from the ADLP to the transponder in the following
order of priority (highest first):
a) Mode S specific services;
b) search requests (5.2.8.1);
c) frames containing only high priority SVC packets; and
d) frames containing only low priority SVC packets.
Recommendation.- Uplink frames should be transferred in
the following order of priority (highestjirst):
a) Mode S specific services;
b) frames containing at least one Mode S ROUTE
packet (5.2.8.1);
c) frames containing at least one high priority SVC
packet; and
d) franzes containing only low priority SIT packets.
5.2.3 Data exchange interfaces
5.2.3.1 THE DTE IS0 8208 INTERFACE
5.2.3.1.1 General provisions. The interface between the
XDLP and the DTE(s) shall conform to IS0 8208 packet layer
protocol (PIP). The XDLP shall support the procedures of the
DTE as specified in IS0 8208. As such, the XDLP shall
contain a DCE (5.2.4).
5.2.3.1.2 Physical and link layer requirements for the
DTUDCE inte$ace. The requirernerlts are:
a) the interface shall be code and byte independent and
shall not impose restrktions on the sequence, order, or
pattern of the bits transferred within a packet; and
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Part I Annex 10 - Aeronautical Telecommunications
b) the interface shall support the transfer of variable
length network layer packets.
5.2.3.1.3 DTE ADDRESS
5.2.3.1.3.1 Ground DTE address. The ground DTE
address shall have a total length of 3 binary coded decimal
(BCD) digits, as follows:
X, shall be the most significant digit. Ground Dm addresses
shall be decimal numbers in the range of 0 through 255 coded
in BCD. Assignment of the DTE address shall be a local issue.
All DTEs connected to GDLPs having overlapping coverage
shall have unique addresses. GDLPs which have a flying time
less than T, (Table 5-1) between their coverage areas shall be
regarded as having overlapping coverage.
5.2.3.1.3.2 Mobile DTE aridress. The mobile DTE
address shall have a total length of 10 BCD digits, as follows:
X, shall be the most significant digit. The digits X, to X, shall
contain the octal representation of the aircraft address coded
in BCD. The digits X8X9 shall identify a sub-address for
specific DTEs on board an aircraft. This sub-address shall be
a decimal number in the range of 0 and 15 coded in BCD. The
following sub-address assignments shall be used:
00 ATN router
01 to 15 Unassigned
5.2.3.1.3.3 lllegal DTE addresses. DTE addresses
outside of the defined ranges or not conforming to the formats
for the ground and mobile DTE addresses specified in
5.2.3.1.3.1 and 5.2.3.1.3.2 shall be defined to be illegal DTE
addresses. The detection of an illegal DTE address in a CALL
REQUEST packet shall lead to a rejection of the call as
specified in 5.2.5.1.5.
5.2.3.1.4 PACKET LAYER PROTOCOL REQUIREMENXY
OF THE DTmCE INTERFACE
5.2.3.1.4.1 Capabilities. The interface between the DTE
and the DCE shall conform to IS0 8208 with the following
　
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