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table-specific notes that follow each state table. "More bit" for long-form MSP packets as
specified in 5.2.7.4
Note 5.- All diagnostic and cause codes are interpreted
as decimal numbers. LAST
PACKET
The contents of the last of the multiplexed
packets
Note 6.- An SVC between an ADCE and a GDCE may be
identijed by n temporary andor permanent channel numbet,
as de$ned in 5.2.5.1.2.
LENGTH The length of a multiplexed packet in bytes
expressed as an unsigned binary number
User data field length; number of user bytes as
specified in 5.2.2.3.1
5.4 MODE S PACKET FORMATS "More bit" for SVC DATA packets as
specified in 5.2.5.1.4.1
5.4.1 Formats. The Mode S packet formats shall be as
specified in Figures 5-3 to 5-22. IWCH
MFJ
IWSN
MSP channel number
5.4.2 Signi$cance of cantmlfields. The structure of the
format control fields used in Mode S packets shall be as
specified in Figure 5-23. The significance of all control fields
used in these packet formats shall be as follows:
MSP packet type (Figure 5-23)
Sequence number; the sequence number for
the long form MSP packet.
Optional data
Field
symbol De$nition ODL Optional data length
AG Address, Ground; the 8-bit binary represen- Option flag
tation of the ground DTE address (5.2.3.1.3.1) Priority field
AM Address, Mobile; the 4-bit binary representation
of the last two BCD digits of the mobile
DTE address (5.2.3.1.3.2)
PR
PS
RC
RT
RTL
S
Packet receive sequence number
Packct send sequence number
CC Clearing cause as defined in IS0 8208 Resetting cause code as defined in IS0 8208
CH Channel number (1 to 15) Route table as defined in 5.2.5.3.3.8
DC Diagnostic code as defined in IS0 8208 Route table length expressed in bytes
"More bit" for CALL REQUEST, CALL
ACCEPT, CLEAR REQUEST and
INTERRUPT packets as specified in
5.2.5.1.4.2
DP Data packet type (Figure 5-23)
F S-bit sequence, first packet flag
FILL Fill field
Sequence number; the sequence number for
FILL1 Has a length of 6 bits for a non-multiplexed this packet type
packet in a downlink SLM frame; otherwise it
is 0 bit
Supervisory packet (Figure 5-23)
Supervisory subset number (Figure 5-23)
FILL2 Has a length of 0 bit for a non-multiplexed
packet in a downlink SLM frame and for a
multiplexing header; othemise it is 2 bits
Supervisory type (Figure 5-23)
Temporary channel number (1 to 3)
FIRST The contents of the first of the multiplexed
PACKET packets User data field
Part Z Annex 10 - Aeronautical Telecommunications
TABLES FOR CHAPTER 5
Table 5-1. ADLP Mode S subnetwork timers
Timer name Timer label Nominal value Reference
Channel retirement Tr 600 s 5.2.8.3.1
Active channel-ADLP Tx 420 s 5.2.8.3.2
Interrogator interrogation Ts 60 s 5.2.8.1.2
interrogator link Tz 30 s 5.2.7.1.1.4.2, 5.2.8.1.3.2
Link frame cancellation Tc 60 s 5.2.2.1.1.4.5
L-bit delivery-ADLP Tm 120 s . 5.2.7.4.3
Packa resequencing and S-bit delivery T9 60 s 5.2.6.9
Table 5-2. DCE actions at state transition
DCE state State definition Action that shall be taken when entering the stare
rl PACKET LEVEL READY Return all SVCs to the pl state (see pl state explanation).
r2 DTE RESTART REQUEST Return each SVC to the pl state (see pl state explanation). Issue a RESTART
CONFIRMATlON to the DTE.
r3 DCE RESTART REQUEST Issue a RESTART REQUEST to the DTE. Unless entered via the r2 state, send a
RESTART REQUEST to the reformatting process.
PI READY Release all resources assrgned to SVC. Break the correspondence between the
DTUDCE SVC and the ADCVGDCE SVC (the ADCWGDCE SVC may not yet be
in thepl state).
p2 DTE CALL REQUEST Determine if sufficient resources exist to support request; if so, allocate resources and
forward CALL REQUEST packet to reformatting process; if not, enter DCE CLEAR
REQUEST to DTE state (p7). Determination of resources and allocation is as defined
in IS0 $208.
~3 DCE CALL REQUEST Determine If sufficient resources exist to support request: if so allocate resources and
forward CALL REQUEST packet to DTE; if not, send a CLEAR REQUEST packet
to the reformatting process. Determination of resources and allocation is as defined in
IS0 8208.
p4 DATA TRANSFER No action.
PS CALL COLLISION Reassign outgoing call to another SVC (the DTE in its call collision state ignores the
incoming call) and enter the DCE CALL REQUEST state (p3) for that new SVC.
Enter the p2 state to process the CALL REQUEST from the DTE
p6 DTE CLEAR REQUEST Release all resources assigned to SVC, send a CLEAR CONFIRMATION packet to
　
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