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request with a connection priority value equal to 2 through
254, the XDLP shall clear the virtual circuit using DC = 66
and CC = 13 1. The use of CC is optional.
5.2.5.1.5.4 Unsupported facility. If the XDLP receives a
call request with a request for a facility that it cannot support,
the XDLP shall clear the virtual circuit using DC = 65 and
CC = 131. The use of CC is optional.
5.2.5.1.5.5 Illegal calling DTE address. If the XDLP
receives a call request with an illegal calling DTE address
(5.2.3.1.3.3), the XDLP shall clear the virtual circuit using
DC= 68 and CC = 141. The use of CC is optional.
5.2.5.1.5.6 Illegal called DTE address. If the XDLP
receives a call request with an illegal called DTE address
(5.2.3.1.3.3), the XDLP shall clear the virtual circuit using
DC - 67 and CC -. 141. The use of CC is optional.
5.2.5.2 REFORMATTING PROCESS
Note.- The reformatting process is divided into two
subpmcesses: uplink formatting and downlink formatting. For
the ADLT: the uplink process reformats Mode S packets into
IS0 8208 packets and the downlink process reformats IS0
8208 packets into Mode S packets. For the GDLT: the uplink
process reformats IS0 8208 packets into Mode S packets and
the downlink process reformats Mode S packets into IS0 8208
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 Translated packet 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 S-bit processing (5.2.5.1.4.2)) as follows:
5.2.5.2.1.1.2 Data packet type (DP). This field shall be set
to 0.
5.2.5.2.1.1.3 MSP packet type (MP). This field shall. be
set to I.
5.2.5.2.1.1.4 Supervisoly packet (SP). This field shall be
sel lo 1.
28111102
No. 77
Part 1 Annex 10 - Aeronautical Tehcommunications
5.2.5.2.1.1.5 Supervisory type (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 I for a high priority SVC. The value
for this ficld shall be obtained from the data transfer field of
the priority facility 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
prionty facility shall be ignored.
5.2.5.2.1.1.7 Seg~lence nl~rnbcr (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 15 values
from 1 rhrough 15. The highest available channel number shall
be chosen from the ~ o o lA. n 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 DTWDCE 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 transferred within the
Mode S link layer:
5.2.5.2.1.1.10 Address, ground (AG). This address shall
be the ground D E 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.
5.2.5.2.1.1.1 1 Fill field. The fill field shall be used to
align subsequent data 15elds on byte boundaries. When
indicated as ''FILL:nW, the fill field shall be set to a length of
"n" bits. When indicated as "FILL1 : 0 or 6", the fill 15eld shall
be set to a length of 6 bits for a non-multiplexed packet in a
downlink SLM framc and 0 bit for all other cases. When
indicated as "FILL2: 0 or 2", the fill field shall be set to a
length of 0 bit for a non-multiplexed packet in a downlink
SLM frame or for a multiplexing header and 2 bits for all other
cases.
5.2.5.2.1.1.12 Sfield (S). A valuc 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.
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