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(forward)
Nore.- Tahle enlries are defined as follows: A = acrion lo be mken, S = the stare to be entered, D = the diagnostic code to be used in
packets generated nr a result of this acrion, DISCARD indicates that the received packer is to be clearedfmm the XDLP buffers, and
INVALID indicates that the packe.V.state combination cannot occur:
Annex I0 - Aeronautical TeZecommunications
Table 5-12. XDCE effect on DCE interrupt transfer states
Volume IIZ
Table 5-13. GDLP Mode S subnetwork timers
Packet received from XDCE
. . .. --
Timer name Timer label Nominal value Reference
DCE interrupt transfer states (see Note)
DTE INTERRUPT READY DTE INTERRUPT SENT
i 1 i2
Active channel-GDLP Tx 5.2.8.3.2
L-bit dclivcry-GDLP Tm 5.2.7.4.3
Packet resequencing and S-bit delivery T9 60 s 5.2.6.9
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INTERRUPT CONFIRMATION INVALID - A=NORMAL
S=il.
(forward)
Packet received from XDCE
DCE interrupt transfer states (see Note)
DCE INTERRUPT READY DCE INTERRUPT SENT
jl j2
INTERRUPT A=NORMAL INVALID
S=j2
(forward)
Nore.- Table entries are defined us follows: A = action ro be taken, S = the stare to be entered, D = the diagnostic code to be used in
packers generared as a resulr of [his acrion, DISCARD indicares rhnr rhe received packer is m be cleared from the XDLP buffets, and
INVAWD indicares that the packet/smre combination cunnor occur:
Annex 10 - Aeronautical Telecommunications
Table 5-14. XDCE actions at state transition
XDCE stare State defirrition Acrion rhar shall be taken when enrering the srare
t 1 PACKET LEVEL READY Return all SVCs to the pl state.
P 1 READY Release all resources assigned to the SVC. Break the correspondence between
the ADCEIGDCE SVC and the DTEDCE SVC (the DTEJDCE SVC may not
yet be in a p1 state).
~2 GDLP(ADLP) CALL REQUEST Determine if sufficient resources exist to support request; if so alIocate
resources and forward Mode S CALL REQUEST packet to reformatting
process; if not, enter ADCE(GDCE) CLEAR REQUEST to GDLP(ADLP) state
@7).
~3 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 REQUEST to reformatting process and go to state
pl. Do not forward the Mode S CALL REQUEST to the peer XDCE.
P4 DATA TRANSFER No action.
~6 GDLP(p'pLP) CLEAR REQUEST Release all resources, send a Mode S CLEAR CONFlRMATlON packet to the
peer XDCE and enter the pl state.
P7 ADCE(GDCE) CLEAR REQUEST to Forward Mode S CLEAR REQUEST packet to the peer XDCE via frame
GDLP(ADLP) processing.
dl FLOW CONTROL READY No action.
d2 GDLP(ADLP) RESET REQUEST Remove Mode S DATA packets hansmitted to peer XDCE from window;
discard any DATA packets that represent partially transmitted M-bit sequences
and discard any Mode S INTERRUFT packets awaiting transfer to the peer
XDCE; 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 reformatting process.
d3 ADCE(GDCE) RESET REQUEST to Remove Mode S DATA packets transmitted to peer XDCE from window;
GDLP( ADLP) discard any DATA packets that represent partially transmitted M-bit sequences
and discard any Mode S INTERRUPT packets awaiting hansfer to the peer
XDCE; reset all flow control window counters to 0 (5.2.6.7.1). Forward Mode S
RESET REQUEST packet to peer XDCE via frame processing.
il GDLP(ADLP) INTERRUPT READY No acrion.
i2 GDLP(ADLP) INTERRUPT SENT Fonvard Mode S INTERRUPT packet received from peer XDCE to the
reformatting process.
j 1 ADCE(GDCE) INTERRUPT READY No action.
j2 ADCE(GDCE) INTERRUPT SENT Forward Mode S INTERRUPT packet received from the reformatting process.
fl ADCE(GDCE) RECEIVE READY No action.
fl ADCE(GDCE) RECEIVE NOT No action.
READY
s 1 GDLP(ADLP) RECEIVE READY No action.
g2 GDLP(ADLP) RECEIVE NOT No action.
READY
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Annex I0 - Aeronautical Telecommunications Volume I11
Table 5-15. GDLP (ADLP) effect on ADCE (GDCE) packet layer ready states
7111196
Nu. 71
Packet received from GDLP (ADLP)
(see Note 2)
ADCE (GDCE) stales
(see Notes 1 and 3)
PACKET LEVEL READY
rl
Channel number 0 See Table 5-16
Unassigned packer header A= DISCARD
Call Setop, call cleating, DATA, interrupt, flow conrtol, or reset See Table 5- 16
NOTES:
1. The XDCE state is not necessarily the same state as the DTElDCE interface.
2. All packets from the peer XDLP have been checked for duplication before evaluation as represented by this table.
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