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ADLP rerormatting process ol an IS0 8208 CALL ACCEPT
packet from the local DCE shall result in the generation of
corresponding Mode S CALL ACCEPT by ADLP 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.
5.2.5.2.3.1.2 Data packet type (DP). This field shall be set
to 0.
5.2.5.2.3.1.3 MSP packet type (MP). This field shall be
set LO 1.
5.2.5.2.3.1.4 Supervisory pucket (SP). This field shall be
set to 1.
5.2.5.2.3.1.5 Supzrvisoly type (ST). This field shall be set
to 1.
5.2.5.2.3.1.6 Xemporav channel number (TC). The TC
value in the originating Modc S CALL REQUEST by GDLP
packet shall be returned to the GDLP along with the channel
number (CH) assigned by the ADLP.
5.2.5.2.3.1.7 Channel number (CH). The field shall bc set
equal to the channcl number assigned by the ADLP as
determined during the CALL REQUEST procedures for the
Mode S connection.
5.2.5.2.3.1.8 Address, mobile and address. ground. The
AM and AG values in the originating Mode S CALL
REQUEST by GDLP packet shall be returned in these ficlds.
When present, DTE addresses in the IS0 8208 CALL
ACCEPT packet shall be ignored.
5.2.5.2.3.2 Translation into IS0 8208 packets
5.2.5.2.3.2.1 Tramlation. Reception by the GDLP reformatting
proccss of a Mode S CALL ACCEPT by ADLP packet (or
an S-bit sequence of packets) from the GDCE shall result in the
generation of a corresponding IS0 8208 CALL ACCEPT packet
to the local DCE. The translation from the Mode S packet to the
IS0 8208 packet shall be the inverse of the processing defmed in
5.2.5.2.3.1 with the exceptions as specified in the following
paragraph.
5.2.5.2.3.2.2 Called DTE, calling DTE address and length
$fields. Whcrc present, the called DTE address shall be
composed of thc aircraft address and the value contained in the
AM field of the Mode S packet, convcrtcd to BCD
(5.2.3.1.3.2). Where present, the calling DTE address shall be
the ground DTE address contained in thc AG ficld of the
Mode S packet, converted to BCD. The length field shall be
as defined in IS0 8208.
2811 1/02
No. 77
Part 1 Annex 10 - Aeronautical Telecummunications
Note.- Tlze culled and calling DTE addresses are optional
in the corresponding IS0 8206 pucket and are not requiredjor
correct opcrution of the Mode S subnetwork.
5.2.5.2.4 CALL ACCEPT BY GDLP
Modc S packet, converted to BCD. The length field shall be as
defined in IS0 8208.
Note.- The called and calling DTE addresses ure oprional
in thc corresponding IS0 8208 packet and are rtot required for
correct operation of the Mode S subnetwork.
5.2.5.2.4.1 Translution into Mode S packets
5.2.5.2.5 CLEAR REQUEST BY ADLP
5.2.5.2.4.1.1 Translated packet format. Rcccption by the
GDLP reformatting process of an IS0 8208 CALL ACCEPT
packet from the local DCE shall result in the generation of
corresponding Mode S CALL ACCEPT 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.
5.2.5.2.4.1.2 Data packet rype (DP).T his field shall be set
to 0.
5.2.5.2.4.1.3 MSP packet type (MP). This field shall be
set to 1.
5.2.5.2.4.1.4 Supervisory packet (SP). This field shall be
set to I.
5.2.5.2.4.1.5 Supewisory type (ST). This field shall be set
to 1.
5.2.5.2.4.1.6 Address, mobile and address, ground. The
AM and AG values in the originating Mode S CALL
REQUEST by ADLP packet shall be returned in these fields.
When present, DTE addresses in the IS0 8208 CALL
ACCEIT packet shall be ignored.
5.2.5.2.4.2 Translation into I S 0 8208 packets
5.2.5.2.4.2.1 Translation. Reception by the ADLP reformatting
process of a Mode S CALL ACCEPT by GDLP packet (or
an S-bit sequence of packets) from the D C E shall result in the
generation of a corresponding IS0 8208 CALL ACCEPT packet
to the local DCB. The translation Crom the Mode S packet to he
IS0 8208 packet shall be thc inverse of the proccssing delincd in
5.2.5.2.4.1 with the exceptions as specified in the following
paragraph.
5.2.5.2.4.2.2 Called DTE, calling DTE address and length
Jields. Where present, the calling DTE address shall be
composed of the aircraft address and Lhe value contained in
the AM field of thc Mode S packet, converted to BCD
(5.2.3.1.3.2). Where present, the called DTE address shall be
the ground DTE address contained in the AG field of the
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