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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 IS 0 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 packer type (MP). This field shall be
set to 1.
5.2.5.2.1.1.4 Supervisory packer (SP). This field shall be
set to 1.
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 1 for a high priority SVC. The
value for this field 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 I S 0 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 chan~lel
number shall be chosen from the pool of SVC channel
numbers available to the ADLP. The pool shall consist of 15
values from I 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 bc
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 aircrafi address is transferred within
the Mode S link layet:
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 field The fill field shall be used to
align subsequent data fields on byte boundaries. When indicated
as "F'ILL:nv, the fill field shall be set to a length of "n"
bits. When indicated as "FILLI: 0 or 6", the fill field shall be
set to a length of 6 bits for a non-multiplexed packet in a
downlink S Mfr ame 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 Sjeld (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.
Annex 10 - Aeronautical Telecommunications Volume 111
5.2.5.2.1.1.13 FS jeld (FS). A value of 0 shall indicate
that the packet does not contain fast select data. A value of 2
or 3 shall indicate that the packet contains fast select data. A
value of 2 shall indicate normal fast select operation. A value
of 3 shall indicate fast select with restricted response. An FS
value of 1 shall be undefined.
5.2.5.2.1.1.14 First packet flag (F). This field shall be
set to 0 in the first packet of an S-bit sequence and in a packet
that is not part of an S-bit sequence. Otherwise it shall be set
to 1.
5.2.5.2.1.1.15 User data length (LV). This field shall
indicate the number of full bytes used in the last SLM or ELM
segment as defined in 5.2.2.3.1.
5.2.5.2.1.1.16 User datajeld (UD). This field shall only
be present if optional CALL REQUEST user data (maximum
16 bytes) or fast select user data (maximum 128 bytes) is
contained in the IS0 8208 packet. The user data field shall be
transferred from IS0 8208 packet unchanged using S-bit
processing as specified in 5.2.5.1.4.2.
5.2.5.2.1.2 Translation into IS0 8208 packets
5.2.5.2.1.2.1 Translation. Reception by the GDLP
reformatting process of a Mode S CALL REQUEST by ADLP
packet (or an S-bit sequence of packets) from the GDCE shall
result in the generation of a corresponding IS0 8208 CALL
REQUEST packet to the local DCE. The translation from the
　
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