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Sequence number; thc 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
Resctting 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 subsct number (Figure 5-23)
Supervisory type (Figure 5-23)
Temporary channel number (1 to 3)
User data field
711 1/9/96
No. 71
Part I 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
Packet resequencing and S-bit delivery Tq 60 s 5.2.6.9
Table 5-2. DCE actions at state transition
DCE stale State de9nition Acriofi thut shall be taken when entering the state
rl PACKET LEVEL READY Return all SVCs to the pl state (see pl state explanation).
r2 DTE RESTART IZEQUEST Return each SVC to the pl state (scc 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.
P 1 READY Relcase all resources assigned to SVC. Break the correspondence between the
DTWDCE SVC and the ADCEIGDCE SVC (the ADCWGDCE SVC may not yet be
in the pl state).
~2 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 8208.
~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 defincd in
IS0 8208.
P4 DATA TRANSFER No action.
~5 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.
~6 DTE CLEAR REQUEST Release all resources assigned to SVC, send a CLEAR CONFIRMATION packet to
the DTE and enter pl state.
~7 DCE CLEAR REQUEST to 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 represent partially transmitted M-bit sequences and discard any INTERRUPT
packct awaiting transfcr to the DTE; reset all window counters to 0; set any timers
and retransmission parameters relating to DATA and INTERRUPT transfer to their
initial value. Send RESET CONFIRMATION packet to DTE. Return SVC to dl state.
d3 DCE RESET REQUEST to DTE Remove DATA packets transmitted to DTE from window; discard any DATA packets
that represent partially transmitted M-bit sequences and discard any INTERRUFT
packet awaiting transfer to the DTE; reset all window counters to 0; set any timers
and retransmission parameters relating to DATA and INTERRUPT transfer to their
initial value. Forward RESET REQUEST packet to DTE.
7/11/96
249 No. 71
Annex 10 - Aeronautical Te~ecommunications Volume ZZZ
DCE state State deptzition Action that shall he taken when entering the state
i l DTE INTERRUPT READY No action.
i2 DTE INTERRUPT SENT Forward INTERRUPT packet received from DTE lo reformatting process.
11 DCE INTERRUPT READY No action.
j2 DCE INTERRUPT SENT Forward INTERRUPT packet received from reformatting process to DTE.
fl DCE RECETVE READY No action.
fl DCE RECEIVE NOT READY No action.
g 1 DTE RECEIVE READY No action.
g2 DTE RECEIVE NOT READY No action.
Table 5-3. DCE special cases
DCE special cases
Received from DTK Any state
Any packet less than 2 bytes in length (including a valid data link levd frame containing no A=DIAG
packet) D=38
Any packt with an invalid general format identifier A=DIAG
D=40
Any packet with a valid general format identifier and an assigned logical channel identifier
(includes a logical channel identifier of 0) See Table 5-4
　
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