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retransmission parameters relating to DATA and INTERRYPT transfcr to their initial
value. Send RESET CONPlRMATION packet to DTE. Return SVC to dl slate.
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No. 77
Annex 10 - AeronauticaE Teleconznzunications Volume 111
DCE state Stnte definirion Aclion rhar shall be taken when entering the 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 INTERRUPT packet
awaiting transfer to the DTE; reset all window counters to 0; set any timers and
retransmission paramters relating to DATA and INTERRUPT transfer to their initial
value. Forward RESET REQUEST packet to DTE.
i 1 DTE INTERRUPT READY No action.
i2 DTE INTERRUPT SENT Forward INTERRUPT packet received from Dm to reformatting process.
jl DCE INTERRUPT READY No action.
j2 DCE INTERRUPT SENT Forward INTERRUPT pacht received from reformatting process to DTE.
fl DCE RECEIVE READY No action.
j2 DCE RECEIVE NOT READY No action.
gl DTE RECEIVE READY No action.
g2 DTE RECENE NOT READY No action.
Table 5-3. DCE special cases
DCE special cases
Received from DTE Any slate
Any packet less than 2 bytes in length (including a valid data link level frame containing no packet) A=DIAG
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 See Table 5-4
a logical channel identifier of 0)
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Part I Annex 10 - Aeronautical Telecommunications
Table 5-4. DTE effect on DCE restart states
DCE restart states (see Note 5)
Packet received from DTE
PACKET LEVEL DTE RESTART DCE RESTART
READY (see Note 1) REQUEST REQUEST
rl 1-2 r3
Packets having a packet type identifier shorter than 1 byte
and logical channel idemifier not equal, to 0
Any packet, except RESTART, REGISTRATION
(if supporlcd) with a logical channel identiher of 0
Packet with a packet type identifier which is undefined or
not supported by DCE
See Table 5-5 A=ERROR
S=r3
D=33
(see Nok 4)
RESTART REQUEST, RESTART CONFIRMATION,
or REGISTRATION (if supported) packet with a logical
channel identifier unequal to 0
See Table 5-5 A =ERROR
S=r3
D=41
(see Note 4)
RESTART REQUEST A=NORMAL
(forward)
S= r2
A=NORMAL
S=pl or dl
(see Notc 2)
RESTART CONFIRMATION A=ERROR
S= r3
D= 17
(see Note 6)
A =ERROR
S=r3
D=l8
(see Note 4)
A=NORMAL
S=pl or dl
(see Note 2)
RESTART REQUEST OR RESTART CONFIRMATION
packet with a format error
REGlSTRATION REQUEST or REGISTRATION
CONFIRMATION packets (see Note 3)
REGISTRATION REQUEST or REGISTRATION
CONFIRMATION packet with a format error
(see Note 3)
A= ERROR
S=r3
D=38, 39, 81 or 82
(see Notc 4)
Call setup, call clearing, DATA, interrupt, ilow control, or
resct packet
Sec Table 5-5 A= ERROR
S=r3
0=18
NOTES:
1. The Modc S subnetwork has no restart states. Receipt of a RESTART REQUEST causes the DCE to respond with a RESTART
CONFIRMATION. The RESTART REQUEST packet is forwarded to the reformalting process, which issues clear requests for all SVCs
associated with the DTE. The DCE cntcrs the r3 state only as a result of an error delccted on the DTElDCE interface.
2. The SVC channels arc returned to state pl, thc permanent virtual circuits (PVC) channels arc returned to state dl.
3. The use of the registration lacility is optional on the DTEIDCE interface.
4. No action is takcn within the Modc S subnetwork.
5. Table entries arc defined as follows: A = action to be takcn, S = the stale to be entered, D = the diagnostic code to be used in packets
generated as a result of this action, DISCARD indicates that the received packet is to be cleared for the XDLP buffers, and INVALID
indicates that the packetlstatc cornbination cannot occur.
6. The error procedure consisls of cntcring thc r3 state, and sending a RESTART REQUEST to the reformatting process.
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Annex I0 - Aeronautical Telecommunications
Table 5-5. DTE effect on DCE call setup and clearing states
Volume ZZZ
Packet received from
DTE
DCE call setup and clearing states (see Note 5)
CALL
COLLISION DCE CLEAR
DTE CALL DCE CALL DATA ~5 DTE CLEAR REQUEST to
READY REQUEST REQUEST TRANSFER (see Notes 1 REQUEST DTE
P I ~2 ~3 ~4 and 4) ~6 ~7
Packets having a packet A=ERROR A=ERROR A=ERROR Sce Table 5-6 A=ERROR A=ERROR A=DISCARD
type identifier shorter S=p7 S=p7 S=p7 S=p7 S=p7
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