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5.2.5.2.5.1 Translation into Mode S packets
5.2.5.2.5.1.1 Tran.slated packet ,format Reception by the
ADLP reformatting process of an IS0 8208 CLEAR
REQUEST packct from the local DCE shall result in the
generation of a corresponding Mode S CLEAR REQUEST by
ADLP 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 and
5.2.5.2.2.
5.2.5.2.5.1.2 Data packet type (DP). This field shall be set
to 0.
5.2.5.2.5.1.3 MSP packet type (MP). This field shall be
set to 1.
5.2.5.2.5.1.4 Supervisory packet (SP). This field shall be
set to 1.
5.2.5.2.5.1.5 Channel number (CH): If a channel number
has been allocated during the call acceptance phase, then CW
shall be set to that value, otherwise it shall be set to zero.
5.2.5.2.5.1.6 Temporaly channel (TC): If a channel
number has been allocated during the call acceptance phase,
then TC shall be set to zero, otherwise it shall be set to the
value used in the CALL REQUEST by GDLp
5.2.5.2.5.1.7 Supervisory type (ST). This field shall bc s a
to 2.
5.2.5.2.5.1.8 Address, ground or address, mobile. The AG
and AM values in the originating Mode S CALL REQUEST
by ADLP or CALL REQUEST by GDLP packets shall be
returned in these fields. When present, DTE addresses in the
IS0 8208 CLEAR REQUEST packet shall be ignored.
5.2.5.2.5.1.9 Clearing cause (CC) and diagnostic code
(DC).fields. These fields shall be transferred without modification
from the IS0 8208 packet to the Mode S packet when the
28/11/02
No. 77
Annex 10 - Aeronautical Telecommunications Volume 111
DTE has initiated the clear procedure. If the XDLP has 5.2.5.2.6.1.6 Temporary channel (TC): If a channel
initiated the clear procedure, the clearing cause field and number has been allocated during the call acceptance phase,
diagnostic field shall be as defined in the state tables for the then TC shall be set to zero, otherwise it shall be set to the
DCE and XDCE (see also 5.2.6.3.3). Thc coding and value used in the CALL REQUEST by GDLP.
definition of these fields shall be as specified in IS0 8208.
5.2.5.2.6.1.7 Supewisoly type (ST). This field shall be set
to 2.
5.2.5.2.5.2 Translation into IS0 8208 packets
5.2.5.2.6.2 Translation into IS0 8208 packets
5.2.5.2.5.2.1 Translation. Reception by the GDLP reformatting
process of a Mode S CLEAR -WQL~ST by ADLP packet 5*2.5.2.6.2.1 Translation Reception by the ADLP
(or an S-bit sequcnce of packets) from the local GDCE shall reformatting process of a Mode CLEAR REQUEST by
in the generation of a corresponding IS' 8208 CLEAR GDLP packet (or an S-bit sequence of packets) from the local
REQUEST packet to the local DCE. The from Ihe ADCE shall result in the generation of a corresponding IS0
Mode S packet to the IS0 8208 packct shall be the inverse of the 8208 CLEm REQUEST packet to the local DCE. The Lransprocessing
defined in 5.2.5.2.5.1 with the exceptions specified in lation from the Mode to ISO 8208 packet shall be
the following paragraphs. the inverse of thc processing defined in 5.2.5.2.6.1.
5.2.5.2.5.2.2 Called DTE, calling DTE and length fields.
Thesc lields shall be omitted in the IS0 8208 CLEAR
REQUEST packet.
5.2.5.2.5.2.3 Clearing Cause Field. This field shall be set
taking account of 5.2.6.3.3.
5.2.5.2.6 CLEAR REQUEST BY GDLP
5.2.5.2.6.1 Translation into Mode S packets
5.2.5.2.6.1.1 Translated packet format. Reception by the
GDLP reformatting process of an IS0 8208 CLEAR
REQUEST packet from thc local DCE shall result in thc
generation of corresponding Mode S CLEAR 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 and 5.2.5.2.5.
5.2.5.2.6.1.2 Data packet type (LIP). This ficld shall be set
to 0.
5.2.5.2.6.1.3 MSP packet type (MP). This field shall be
set to 1.
5.2.5.2.6.1.4 S~lpemisoryp acket (SP). This field shall be
set to 1.
5.2.5.2.6.1.5 Clzannel rz~lrnber( CH): If a channel number
has been allocated during the call acceptance phase, thcn CH
shall bc set to that value, otherwisc it shall be set to zero.
5.2.5.2.6.2,2 Called DTE, calling DTE and length fields.
These fields shall be omitted in the IS0 8208 CLEAR
REQUEST packet.
5.2.5.2.7 DATA
5.2.5.2.7.1 Translation into Mode S packets
5.2.5.2.7.1.1 Translated packet format. Reception by the
XDLP reformatting process of IS0 8208 DATA packet(s) from
the local DCE shall result in the generation of corresponding
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