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used in these packet formats shall be as follows:
Field
symbol Definition
AG Address, Ground; the 8-bit binary representation
of the ground DTE address (5.2.3.1.3.1 )
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)
CC Clearing cause as defined in IS0 8208
CH Channel number (1 to 15)
DC Diagnostic code as defined in IS0 8208
DP Data packet type (Figure 5-23)
F S-bit sequence, first packet flag
FILL Fill field
FILL1 Has a length of 6 bits for a non-multiplexed
packet in a downlink SLM frame; otherwise it
is 0 bit
FILL2 Has a length of 0 bit for a non-multiplexed
packet in a downlink SLM frame and for a
multiplexing header; oherwise it is 2 bits
FIRST The contents of the first of the multiplexed
PACKET packcts
OD
ODL
OF
P
PR
PS
RC
RT
RTL
S
FS Fast select present
IN Initialization bit
L "More bit" for long-form MSP packets as
specified in 5.2.7.4
LAST The contents of the last of the multiplexed
PACKET packets
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
"More bit" for SVC DATA packets as specified
in 5.2.5.1.4.1
MSP channel number
MSP packet type (Figure 5-23)
Sequence number; the sequence number for
the long form MSP packet
Optional data
Optional data length
Option flag
Priority field
Packet receive sequence number
Packet send sequence number
Resetting cause code as defined in IS0 8208
Route table as defined in 5.2.5.3.3.8
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
Sequence number; the sequence number for
this packet type
Supervisory packet (Figure 5-23)
Supervisory subset number (Figure 5-23)
Supervisory type (Figure 5-23)
Temporary channel number (1 to 3)
User data field
28/11/02
No. 77
Annex 10 - Aeronautical Telecornrnunications
TABLES FOR CHAPTER 5
Table 5-1, ADLP Mode S subnetwork h e r s
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 lin 120 s 5.2.7.4.3
Packet resequencing and S-bit delivery TS 60 s 5.2.6.9
Table 5-2. DCE actions at state transition
- - -
DCE state State definltron Action that shall be taken when enterlng the state
rl PACKET LEVEL READY Return all SVCs to the pl state (scc pl slate explanation)
r2 DTE RESTART REQUEST Return each SVC to the pl state (see pl state explanation). Issue a RESTART
CONFIRMATION 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.
pl READY Release all resources assigncd to SVC. Break the correspondence between the DTE/DCE
SVC and the ADCEIGDCE SVC (the ADCEIGDCE SVC may not yct be in the pl statc).
p2 DTE CALL REQUEST Dckrmine if sufficient resources exist to support rcqucst; if so, allocate resources and
forward CALL REQUEST packet to reformatting process; if not, enter DCE CLEAR
REQUEST to DTE state @7). Determination of resources and allocation is as defined in
IS0 8208.
p3 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.
p5 CALL COLLISION Reassign oulgoing call to another SVC (the DTE in its call collision state ignores thc
incoming call) and enter the DCE CALL REQUEST state @3) for that new SVC. Enter
the p2 state to process the CALL REQUEST from the DTE.
p6 DTE CLEAR REQUEST Rclcasc all resources assigned to SVC, send a CLEAR CONFIRMATION packet to the
DTE and enter pl state.
p7 DCE CLEAR REQUEST lo DTE Forward CLEAR REQUEST packet to DTE
dl FLOW CONTROL READY No action
d2 DTE RESET REQUEST Remove DATA packets transmitted to DTE from window; discard any DATA packets that
reprcscnt partially transmitted M-bit sequences and discard any INTERRUPT packel
awaiting transicr to the DTE; reset all window counters to 0: sct any timers and
　
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