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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 $-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 datafield (UID). 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 8205 packets
5.2.5.2.1.2.1 Translation. Reception by the GDLP
reformatting process of a Mode S CALL REQUEST by ADLP
7/11/96
No. 71
Annex 119 - Aeronautical Telecommunications Volume III
packet (or an S-bit sequence of packets) from the GDCE shall 5.2.5.2.2.1.8 Address, mobile (AM). This address shall
result in the generation of a corresponding IS0 8208 CALL be the mobile DTE sub-address (5.2.3.1.3.2) in the range of 0
REQUEST packet to the local DCE. The translation from the to 15. The address shall be extracted from the two least
Mode S packet to the IS0 8208 packet shall be the inverse of si~ificantd igits of the called DTE address contained in the
the processing defined in 5.2.5.2.1.1 with the exceptions as IS0 8208 packet and converted to binary representation.
specified in the following paragraph.
5.2.5.2.1.2.2 Called DTE, calling DTE address and 5.2.5.2.2.2 Translation inlo 8208 packets
len~thfi elds. The calling DTE address shall be composed of
the-aircraft address and the value contained in the AM field of 5.2.5.2.2.2.1 Translation. Reception by the ADLP
the Mode S puket, convened to BCD (5.2.3.1.3.2). The called process of a Mode REQUEST by GDLP
DTE address shall be the ground DTE address contained in the packet (or an #&bit sequence of packets) from the ADCE shall
field of the Mode packet, convened lo BCD. The length
result in the of a corresponding IS0 8208 C A u
field shall be as defined in IS0 8208. REQUEST packet to the local DCE. The translation from the
5.2.5.2.2 CALL REQUEST BY GDLP
5.2.5.2.2.1 Translation into Mode S packers
ode S pcket to the IS0 8208 packet shall be the inverse of
the processing defined in 5.2.5.2.2.1 with the exceptions ;is
specified in the following paragraph.
5.2.5.2.2.2.2 Culled DTE, calling DTE address and
length Jields. The called DTE address shall be composed of
5.2.5.2.2.1.1 General. Reception by the GDLP reformat- the aircraft address and the value contAned in the AM field of
ting process of an IS0 8208 CALL REQUEST packet from
the local DCE shall result in the generation of corresponding
the Mode S packet, converted to BCD (5.2.3.1.3.2). The
calling DTE address shall be the ground DTE address
Mode CALL REQUEST by packet(s) (as contained in the AG field of the Mode S packet, converted to
by S-bit processing (5.2.5.1.4.2)) as follows: 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 Translation into Mode S packets
Fields shown in the packet format and not specified in the 5.2.5.2.3.1.1 Translcrtedpacketformat. Receptiorl by the
following paragraphs shall be sct as specified in 5.2.5.2.1. ADLP reformatting process of an IS0 8208 CALL ACCEPT
vacket from the local DCE shall result in the generation of
5.2.5.2.2.1.2 Data pacht type (DP).T his field shall be ~ o ~ ~ sMoPde o C~AL~L A~CC~EP~T " ~ ~acket(s)
set to 0. (as determined by S-bit processing (5.2.5.1.4.2)) as follows:
5.2.5.2.2.1.3 hlSP 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 ficld shall be
set to 0,
5.2.5.2.2.1 -6 Temporary channel nurnberJield (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.
Fields shown in the packet format and not specified in the
　
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