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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 equul to 28 bytes (7 bytes for 4 Comrn-B
segments) nzinus tlzc 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.
5.2.2.6.2 GnLP PRIORITY MANAGEMENT
Recommendation.- Uplink frames should be transferred
in the following order ofpriority (highestfirst):
a) Mode S specific services;
b) frumes contairzirzg at least one Mode S ROUTE
packet (5.2.8.1);
c) frarnes corltaining at least orie lzigh priority SVC
packet; and
d) frarnes containir~g orlly low prior-it)' SVC 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 betwcen the
XDLP and the DTE(s) shall conform to IS0 8208 packet layer
protocol (PLP). 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
DTEIDCE inte$ace. The requirements are:
a) the interface shall be code and byte indcpcndcnt and
shall not impose restrictions on the sequence, order, or
pattern of the bits transferred within a packet; and
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:
Xo shall be the most significant digit. Ground DTE 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 Tr (Table 5-1) between their coveragc areas shall be
regarded as having overlapping coverage.
5.2.3.1.3.2 Mobile DTE address. The mobile DTE address
shall have a total length of 10 BCD digits, as follows:
Xo shall bc the most significant digit. The digits Xo to X7 shall
contain the octal representation of the aircraft address coded in
BCD. The digits X8Xg shall identify a sub-address for specific
DTEs on board an atrcraft. 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 Illegal DTE addresses. DTE addresses
ou~side 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 illcgal DTE
28/11/02
No. 77
Part 1 Annex 10 - Aeronautical Telecommunications
addresses. The detection of an illegal DTE address in a CALL 5.2.3.3 ADLP/TRANSPONDERIN TERFACE
REQUEST packet shall lead to a rejection of the call as
specilicd in 5.2.5.1.5. 5.2.3.3.1 TRANSPONDTEOR A DLP
5.2.3.1.4 PACKET IAYER PROTOCOL REQUIRXMEN~S 5.2.3.3.1.1 The ADD shall accept an indication of
OF THE DTE/DCE INTERFACE protocol type from the transponder in connection with data
transferred from the transponder to the ADLP This shall
5.2.3.1.4.1 Capabilities. The interface between the DTE include the following types of protocols:
and the DCE shall conform to IS0 8208 with the following
capabilities: a) surveillance interrogation;
a) expedited data delivery, i.e. the use of INTERRUF'T b) Comm-A interrogation;
packets with a user data field of up to 32 bytes;
b) priority facility (with two levels, 5.2.5.2.1.1.6); c) Comm-A broadcast interrogation; and
c) fast select (5.2.5.2.1.1.13, 5.2.5.2.1.1.16); and d) uplink ELM.
d) callcd/calling address extension facility, if required by
local conditions (i.e. the XDLP is connected to the DTE
via a network protocol that is unable to contain the
Mode S address as defined).
Other IS0 8208 facilities and the D-bit and the Q-bit shall not
be invoked for transfer over the Mode S packet layer protocol.
5.2.3.1.4.2 Parameter values. The timer and counter
parameters for the DTEIDCE interface shall conform to the
default IS0 8208 values.
5.2.3.2 MODE S SPECIFIC
SERVICES INTERFACE
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