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5.2.5.2.1.1.13 FS $field (FS). A value of 0 shall indicate
that the packet docs not contain fast selcct data. A value of 2
or 3 shall indicate that the packet contains fast select data. A
valuc of 2 shall indicate normal fast select operation. A value
of 3 shall indicate fast select with restricted response. An FS
value of I shall be undefined.
5.2.5.2.1.1.14 First packetflag (F). This field shall bc set
to 0 in ~ hfcir st 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 data field (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
reformat-ting 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 Mode S packet to the IS0 8208 packet
shall be the inverse of the processing defined in 5.2.5.2.1.1
with the exceptions as specified in the following paragraph.
5.2.5.2.1.2.2 Called DTE, calling DTE address and length
fields. The calling DTE address shall be composed of the
aircraft address and the value contained in the AM field of the
Mode S packet, converted to BCD (5.2.3.1.3.2). The called
DTE address shall be the ground DTE address contained in the
AG field of thc Mode S packet, converted to BCD. The length
field shall be as defined in IS0 8208.
5.2.5.2.2 CALL REQUEST BY GDLP
5.2.5.2.2.1 Translarion into Mode S packets
5.2.5.2.2.1.1 General. Reception by the GDLP 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 GDLP packetis) (as determined
by S-bit processing (5.2.5.1.4.2)) as follows:
Fields shown in the packet format and not specified in the
following paragraphs shall be set as specified in 5.2.5.2.1.
2811 1/02
No. 77
Annex 10 - Aeronautical Telecomrnu~zications Volume 111
5.2.5.2.2.1.2 Data packet type (DP). This field shall be set
to 0.
5.2.5.2.2.1.3 MSP packet type (MP). This field shall be
set to 1.
5.2.5.2.2.1.4 Supervisory packet (SP). This field shall be
set to 1.
5~2.5.2.2.1.5 Supervisory type (ST). This field shall be set
to 0.
5.2.5.2.2.1.6 Temporary channel numberfield (TC). This
field shall be used to distinguish multiple call requests from a
GDLP. The ADLP reformatting process, upon receipt of a
temporary channel number, shall assign a channel number
from those presently in the READY state, pl.
5.2.5.2.2.1.7 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 calling DTE address
contained in the IS0 8208 packet and converted to binary
representation.
5.2.5.2.2.1.8 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 called D E address contained in the
IS0 8208 packet and converted to binary representation.
5.2.5.2.2.2 Translation into IS0 8208 packets
5.2.5.2.2.2.1 Translation. Reception by the ADLP refomatting
process of a Mode S CALL REQUEST by GDLP packet (or
an S-bit sequence of packets) from the ADCE shall result in the
generation of a corresponding IS0 8208 CALL REQUEST
packet to the local DCE. The translation from the Mode S packet
to the IS0 8208 packet shall be thc inverse of the processing
defined in 5.2.5.2.2.1 with the exceptions as specified in the
following paragraph.
5.2.5.2.2.2.2 Called DTE, calling DTE uddress and length
fields. The called DTE address shall be composed of the
aircraft address and the value contained in the AM field of the
Mode S packet, converted to BCD (5.2.3.1.3.2). The calling
DTE address shall be the ground DTE address contained in the
AG field of the Mode S packet, converted to BCD. The length
field shall be as defined in IS0 8208.
5.2.5.2.3 CALL ACCEPT BY ADLP
5.2.5.2.3.1 Trunslation into Modc S packets
5.2.5.2.3.1.1 Translured pucket fonnat. Reception by the
　
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