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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 jelds. 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 the 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 Translation 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 packet(s) (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.
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 packer type (MP). This field shall be
set to 1.
5.2.5.2.2.1.4 Supervisorypacket (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 numberjeld (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 DTE 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
reformatting 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 E E . The translation from the
Mode S packet to the IS0 8208 packet shall be the inverse of
the processing defined in 5.2.5.2.2.1 with the exceptions as
specified in the following paragraph.
5.2.5.2.2.2.2 Called DTE, calling DTE address and
length jelds. 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 ADEP
5.2.5.2.3.1 Translation into Mode S packets
5.2.5.2.3.1.1 Translatedpacketformar. Reception by the
ADLP reformatting process of an IS0 8208 CALL ACCEPT
230
Part I Annex 10 - Aeronautical Telecommunications
packet from the local DCE shall result in the generation of the ground DTE address contained in the AG field of the
corresponding Mode S CALL ACCEPT by ADLP packet(s) Mode S packet, converted to BCD. The length field shall be
(as determined by S-bit processing (5.2.5.1.4.2)) as follows: as defined in IS0 8208.
Note.- The called and calling DTE addresses are oprionnl
in the corresponding IS0 8208 packet and are not required
for correct operation of the Mode S subnetwork.
5.2.5.2.4 CALL ACCEPT BY GDLP
Fields shown in the packet format and not specified in the
following paragraphs shall be set as specified i11 5.2.5.2.1. 5.2.5.2.4.1 Translarion into Mode S packets
5.2.5.2.3.1.2 Data packet type (DP). This field shall be 5.2.5.2.4.1.1 Translatedpacket format. Reception by the
set to 0. GDLP reformatting process of an IS0 8208 CALL ACCEPT
packet from the local DCE shall result in the generation of
5.2.5.2.3.1.3 MSP packet Ope (MP).T his field shall be corresponding Mode S CALL ACCEPT by GDLP packet(s)
set to 1. (as determined by S-bit processing (5.2.5.1.4.2)) as follows;
5.2.5.2.3.1.4 Supervisory packet (SP). This field shall be
set to 1.
5.2.5.2.3.1.5 Supervisory type (ST). This field shall be
set to 1.
Fields shown in the packet format and not specified in the
5.2.5.2.3.1.6 Temporary channel number (TC). The TC following paragraphs shall be set as specified in 5.2.5.2.1.
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