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packets shall be combined to the extent possible as dictated by
the M-bit, when transmitting a Mode S DATA packet. If the 5:2.5.1.5.6 Illegal called DTE address. If the XDLP
packet size is smaller on the D C E interface than that defined ,c,;,es a call request with an illegal called ~m
on the DTE/DCE interface, packets shall be fragmented to fit (5.2.3.1.3.3), he XDLP shall dear the virtual circuit using
into the smaller Mode S packet using M-bit assembly. DC= 67 and CC= 141.
5.2.5.1.4.1.3 A packet shall be combined with subsequent
packets if the packet is filled and more packets exist in 5.2.5.2 REFOKMK~IPNRGOC ESS
thc M-bit sequence (M-bit = I). A packet smaller than the
maximum packet size defined for this SVC (partial packet) Note.-- The reformatting process is divided into two
shall only be allowed when the M-bit indicates the end of an suhprocesses: uplink formatting and downlink farrmtting. For
M-bit sequence. A received packet sinaller than the maximum the ADLP, the uplink process reformats Mode S packets ihto
packet size with M-bit equal to 1 shall cause a reset to be I S 0 8208 packets and the downlink process refomts IS0
generated as specified in IS0 8208. 8208 packets into Mode S packets. For the GDLR the uplink
7/11/96
No. 71
Part I Annex 10 - Aeronautical Telecommunications
process refonnuts IS0 8208 packets into Mode S packers and
the downlink process reformats Mode Spackets into IS0 8205
packets.
5.2.5.2.1 CALL REQUEST BY ADLP
5.2.5.2.1.1 Translation into Mode S packets
5.2,5.2.1.1.1 Translatedpacket format- Reception by the
ADLP reformatting process of an IS0 8208 CALL REQUEST
packet from the local DCE shall result in the generation of
corresponding Mode S CALL REQUEST by ADLP packet(s)
(as determined by $-bit processing (5.2.5.1.4.2)) as follows:
5.2.5.2.1.1.2 Data packet type (DP).T his field shall be
set to 0.
5.2.5.2.1.1.3 MSP packet ope (MP). This field shall be
set to 1.
5.2.5.2.1.1.4 Supervisory packet (SP). This field shall be
set to 1.
5.2.5+2.1.1.5 Supervisory iype (ST). This field shall be
set to 0.
5.2.5.2.1.1.6 Priority (P). This field shall be set to 0 for
a low priority SVC and to 1 for a high priority SVC. The
value for this field shall be obtained from the data transfer
field of the p~orityfa cility of the IS0 8208 packet, and shall
be set to 0 if the IS0 8208 packet does not contain the priority
facility or if a priority of 255 is specified. The other fields of
the priority facility shall be ignored.
5.2.5.2.1.1.7 Sequence number (SN). For a particular
SVC, each packet shall be numbered (5.2.6.9.4).
5.2.5.2.1.1.8 Channel number (CH). The channel
number shall be chosen from the pool of SVC channel
numbers available to the ADLP. The pool shall consist of 16
values from 0 through 15. The highest available channel
number shall be chosen from the pool. An available channel
shall be defined as one in state pl. The correspondence
between the channel number used by the Mode S subnetwork
and the number used by the DTEJDCE interface shall be
maintained while the channel is active.
Note.-- Also refer to 5.2.5.1.2 on channel pool management.
5.2.5.2.1.1.9 Address, mobile (AM). This address shall
be the mobile DTE sub-address (5.2.3.1.3.2) in the range of 0
to 15. The address shall be extracted from the two least
significant digits of the calling DTE address contained in the
IS0 8208 packet and converted to binary representation.
Note.- The 24-bit aircraft address is tratlsferred within
the Mode S link layer.
5.2.5.2.1.1.10 Address, ground (AG). This address shall
be the ground DTE address (5.2.3.1.3.1) in the range of 0 to
255. The address shall be extracted from the called DTE
address contained in the IS0 8208 packet and converted to
binary representation.
5.2.5.2.1.1.11 Fill $eld. The fill field shall be used to
align subsequent data fields on byte boundaries. When indicated
as "FnL:n" the fill field shall be set to "n" bits. When
indicated as "FlLLl: 0 or 6", the fill field shall be set to 6 bits
for a downlink SLM frame and 0 bit for all other frames.
When indicated as "FILL2: 0 or 2", the fill field shall be set
to 0 bit for a downlink SLM frame and 2 bits for all other
frames.
5.2.5.2.1.1.12 Sfield (S). A value of 1 shall indicate that
the packet is part of an S-bit sequence with more packets in
the sequence to follow. A value of 0 shall indicate that the
sequence ends with this packet. This field shall be set as
specified in 5.2.5.1.4.2.
5.2.5.2.1.1.13 FSfield (FS). A value of 0 shall indicate
that the packet does not contain fast select data. A value of 2
　
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