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indicates that the packet/state combination cannot occur
Packct receivcd
from XDCE
DCE call setup and clearing states (see Note)
DCE CLEAR
DTE CALL DCE CALL DATA CALL DTE CLEAR REQUEST to
READY REQUEST REQUEST TRANSFER COLLISION REQUEST DTE
P' P2 ~3 P4 P5 p6 P7
CALL REQUEST A-NORMAL INVALID INVALID INVALID INVALID INVALID INVALID
S=p3
(forward)
CALL ACCEPT A=DISCARD A=NORMAL INVALID INVALID INVALID A=DISCARD A=DISCARD
S=p4
(forward)
CLEAR REQUEST A=DISCARD A=NORMAL A=NORMAL A=NORMAL lNVALlD A=DISCARD .A=DISCARD
S=p7 S=p7 S=p7
(forward) (forward) (forward)
DATA, A=L)ISCARD INVALID INVALID See Table 5-1 1 lNVALlD A=DISCARD A=DISCARD
INTERRUPT,
INTERRUPT
CONFIRMATION,
or RESET
REQUEST
Note.- Table entries are defined as follows: A = action to be taken, S = the stare to be entered, D = the diagnostic code to be used m
pockets generated as a result ofthis acnon, DISCARD lndrcates that the recelved pucket u to be cleared from the XDLP burer.~, and INVALID
indicates thar the packedstate combination cannot occur
Part l Annex 10 - Aeronautical Telecomrnu~lications
Table 5-11. XDCE effecl on DCE reset states
I DCE reset states (see Note)
1 INTERRUPT See Table 5-12 A=DISCARD A =DISCARD
Packet received from XDCE
I INTERRUPT CONFIRMATION See Table 5-12 A=DISCARD INVALID
FLOW CONTROL DCE RESET
READY DTE RESET REQUEST REQUEST to DTE
dl d2 (13
"- --
DATA
RESET REQUEST A =NORMAL A=NORMAL A =DISCARD
S=d3 $=dl
(forward) (forward)
A=NORMAL A=DISCARD A=DISCAKD
(forward)
Note.- Tahle entries are defined m,follows: A = action to he taken, S = the state to be entered, D = the diagnostic code to be used in packets
generated as a result o f this action, DISCARD indicates that the receiiled packet is to he cleared from the XDLP buffers, and INVALID indicates
that the packet/state comhination cannot occur
2811 1102
No. 77
Table 5-12. XDCE effect on DCE interrupt transfer slates
7 DCE interrupt ~ransfer states (scc Note)
INTERRUPT CONFIRMATION
Packet received from XDCE
INVALID
DTE INTERRUPT READY DTE INTERRUPT SENT
i l i2
A=NOKMAL
S=il
(forward)
I I DCE interrupt transfer states (see Note)
INTERRUPT
Packet received from XDCE
A=NORMAL
S=j2
(forward)
DCE INTERRUPT READY DCE INTERRUPT SENT
I 1
INVALID
Note.- Table entries at-e defined as,followsr A = action to be taken, S = the stute to be enrered, D = the diagnostic code to be used in packers
generated as a result qf this action. DISCARD indicates that the receivedpacket is to be cleared fmm the XDLP buffers, arid INVALID indicates
the packet/stare combinntion cannor occur
Table 5-13. GDLP Mode S subnetwork timers
-fimer name Timer label Nominal value Reference
Aclive channel-GDLP Tx 300 s 5.2.8.3.2
L-bit delivery-GDLP Tm 120 s 5.2.7.4.3
Packct resequencing and S-bit delivery T9 60 s 5.2.6.9
2811 1/02
No. 77
Part Z Annex I0 - Aervnautical Telecommunicativns
Table 5-14. XDCE actions at state transition
~ D C sEla te Store definition Action that shall be toketi when el~reringt he stare
PACKET LEVEL READY
READY
Return all SVCs to the pl state.
Release all resourccs assigned to the SVC. Break the correspondence between the
ADCWGDCE SVC and the DTEIDCE SVC (the DTEDCF, SVC may not yet be in apl
stale).
CDLP(ADLP) CALL REQUEST Determine if sufficient rcsourccs cxist to support request; if so allocate resources and
forward Mode S CALL REQUEST packet to reformatting process; if not, enter
ADCE(GDCE) CLEAR REQUEST to GDLP(ADLP) state @7).
ADCE(GDCE) CALL REQUEST Determine if sufficient resources exist to support request; if so, allocate resources and
forward Mode S CALL REQUEST packet to frame processing; if not, send Mode S
CLEAR REQlJEST to rcformatting process and go to state p l . Do not forward the Mode
S CALL REQUEST to the peer XDCE.
DATA TRANSFER
GDLP(ADLP) CLEAR REQUEST
No action.
Release all resources, send a Mode S CLEAR CONFIRMATlON packer to the peer
XDCE and enter the p l state.
ADCE(GDCE) CLEAR REQUEST to
GDLP(ADLP)
FLOW CONTROL READY
Forward Mode S CLEAR REQUEST packet to the peer XDCE via frame processing.
No action.
Remove Mode S DATA packets transmitted to peer XDCE from window; discard any
DATA packets that represent partially transmitted M-bit scquences and discard any Mode
S INTERRUPT packets awaiting transfer to the peer XDCB; reset all flow control
window counters to 0 (5.2.6.7.1). Send Mode S RESET CONFIRMATION packet to the
peer XDCE. Return SVC to dl state. Forward Mode S RESET REQUEST packet to
　
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