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the DTE and enter pl state.
p7 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
packet awartrng transfer to the DTE; reset all window counters to 0; set any timers
and retransmission parameters relating to DATA and WERRUPT transfer to their
initial value Send RESET CONFIRMATION packet to DTE. Return SVC to dl state.
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Annex 10 - Aeronautical Telecommunications Volume ZZZ
DCE state State definition Action that shall be taken when entering rhe state
d3 DCE W E T 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 INTERRUPT
packet awaiting transfer to the DTE; reset all window counters to 0; set any timers
and retransrmssron parameters relating to DATA and INTERRUPT transfer to their
initial value. Forward RESET REQUEST packet to DTE.
il DTE INTEEWJPT READY No action.
i2 DTE INTERRUPT SENT Forward INTERRUPT packet received from DTE to reformatting process.
11 DCE INTERRUPT READY No action
12 DCE INTERRUPT SENT Forward INTERRUPT packet received from reformatting process to DTE.
fl DCE RECEIVE READY No action.
fl DCE RECEIVE NOT READY No action.
gl DTE RECEIVE READY No action.
82 DTE RECEIVE NOT READY No action
Table 5-3. DCE special cases
DCE special cases
Received from DTE Any state
Any packet less than 2 bytes in length (including a valid data link level frame containing no A=DIAG
packet) D=38
Any packet 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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Annex 10 - Aeronautical Telecommunications
Table 5-8. DTE effect on DCE flow control transfer states
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No. 73
Packet received from DTE
DCE flow control transfer states (see Notes 2 and 3)
M7E RECEIVE READY DCE RECEIVE NOT READY
fl fl
DATA packet wtth less than 4 bytes A=ERROR A=DISCARD
when using modulo 128 numbering S=d3
0=38
(see Note 4)
DATA packet with invalid PR A-ERROR A =ERROR
S=d3 S=d3
D=2 D=2
(see Note 4) (see Note 4)
DATA packet with valtd PR but A=ERROR A=DISCARD
invalid PS or user data field with S=d3 (process PR data)
improper format D= 1 (in valid PS)
D=39 (UD > max negotiated length)
0=82 (UD unaligned)
(see Note 4)
DATA packet with valid PR with A=ERROR A=DISCARD
M-bit set to 1 when the user data S-d3 (process PR data)
field is partially full D=165
(see Note 4)
DATA packet with valid PR, PS A=NORMAL A =RlSCARD
and user data field format (forward) (process PR data)
Packet received from DTE
DCE flow control transfer states (see Notes 2 and 3)
DTE RECEIVE READY DTE RECEIVE NOT READY
g 1 g2
RR, RNR, or REJECT packet with A=DISCARD A=DlSCARD
less than 3 bytes when using
modulo 128 numbering (see Note 1)
RR, RNR, or REJECT packet with an A=ERROR A=ERROR
inval~d PR S=d3 s=d3
0=2 0=2
(see Note 4) (see Note 4)
RR packet with a valid PR A=NORMAL A=NORMAL
S=gl
RNR packet wlth a valid PR A=NORMAL A=NORMAL
S=g2
REJECT packet with a valrd PR A=NORMAL A=hrORMAL
S=gl
NOTES:
1 The reject procedures not required
2. The RR, RNR and REJECT procedures are a Iocf DTUDCE matter and the correspondrng packets are not forwarded to the XDCE.
3. Table entnes are defined as follows: A = achon to k taken, S = the state to Lx entered, D = the diagnostic code to be used 1n
packets generated as a result of this action, DISCARD tndicates that the received packet is to be cleared from the XDLP buffers,
and INVALID Indicates that the packetlstate combinat~on cannot occur.
4. The error procedure consists of perfomtng the specified act~onsw hen entering the d3 state (which ~ncludesF orwarding a RESET
REQUEST packet to the DTE) and sendtng a RESET REQUEST packet to the XDCE (via the reformatting process).
Annex 10 - A~ronuutical Telecommlrnications
Table 5-9. XDCX effect on DCE restart states
Volume XI1
Table 5-10. XDCE effect on DCE call setup and clearing states
Packet received from XDCE
DCE restart states (see Note)
PACKET LEVEL DTE RESTART RCE RESTART
READY REaUEST
rl r2
REQUEST
r3
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No. 71
CALL REQUEST See Table 5-10 Send CLEAR Send CLEAR
REQUEST to REQUEST to
reformatting process reformatting process
　
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