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NOTES:
1. The timers tN?, tN5 and tN8 are reserved.
2. Timers are started when the SSNDPX receives success status in the transmission status indication LIDU from the
link layer, unless the response SNPDU from the remole SSNDPX has been received prior to the status indication.
Annex 10 - Aeronautical Telecommunications Volume III
Table 4-19. SSNDPX supervision of transmission errors - receiving a "Fail" LIDU
CONNECTION REQUEST
SNPDU type reported through fail
Send clear indication packet to IWF and return the logical
channel to the ready state
SSNDPX action
CONNECTION CONFITUI, CONNECTION No action
RELEASE COMPLETE, INTERRUPT
CONFIRM
RESET CONFIRM
CONNECTION RELEASED
DATA, INTERRUPT
FLOW CONTROL
RESET
Retry once. If retry fails then return the logical channel to
the data transfer state
Retry once. If retry fails then return the logical channel to
the ready state
SSNDPX initiates a reset of thc connection (reset cause =
"network congestion")
SSNDPX initiates a release of the connection (release
cause = "network congestion")
Retry once. If retry fails then initiate a release of the
connection (release cause = "network congestion")
Note.- For SNPDUs which are con$rmed by the remote SSND sub-layer entity, processing of the corresponding
fail LIDU only applies if it is received prior to the reception of the expected response.fmnz the other end.
.
Table 4-20. SSNDPX timers
--
Table 4-21. SSNDPX actions - any state
Timer
SNPDU received from remote SSNDPX Any state
Any SNPDU with an invalid SNPDU ~ype Discard
Any SNPDU less than 2 octets in length Discard
Value (seconds)
Note.- The SNPDU iype is invalid i f it is identified as '"spare" or
"reserved" in Table 4-15.
tN 1 180
tN3 1 20
rN4 120
tN6 1 20
tN7 60
Part I Annex 10 - Aeronaudcal Telecommunications
Table 4-22. SSNDPX actions - connection establishment states
Call setup states (Notes 1, 3)
IWF call request Incoming call
SNPDU received from
remote SSNDPX
CONNECTION
REQUEST
Ready state
CONNECTJON
CONFIRM
CONNECTION
ELEASED
CONNECTION
RELEASE COMPLETE
DATA, INTERRUPT,
INTERRUPT
CONFIRM, RESET,
RESET CONFIRM,
FLOW CONTROL
Action: Normal (forward Not applicable Action: Error send
to JWF) CONNECTION
RELEASED
D = 0001 01 10
(extend clear to IWF)
Action: Error * send Action: Normal (forward Action: Error send
CONNECTION to IWF) or CONNECTION
RELEASED Action: Error (Note 2), RELEASED
D = 0001 0100 send CONNECTION D = 0001 0110
RELEASED (extend clear to IWF)
(extend clear to I W )
D = 0010 1010
Action: Normal (do not Action: Normal (forward Action: Normal (foward
forward) to IWF) to IWF)
Action: Error * send Action: Error send Action: Error send
CONNECTION CONNECTION CONNECTION
RELEASED RELEASED RELEASED
D = 0001 0100 D = 0001 0101 D = 0001 0110
(extend clear to IWF) (extend clear to IWF)
Action: Error * send Action: Error send Action: Error send
CONNECTION CONNECTION CONNECTION
RELEASED RELEASED RELEASED
D = 0001 0100 D = 0001 0101 D = 0001 01 10
(extend clear to I w (extend clear to IWF)
*SSNDPX internal connection release request (i.e. IWF not informed)
NOTES:
1. In cases where the SNPDU is not acceptable to the state of the logical channel (i.e., Action = Error), the clearing
cause field is equal to 147, i.e. SSND local link error.
2. The error may occur if fast select with restriction on response has been requested.
3. If the SNPDU is acceptable to the state 01' the logical channel (i.e. action = normal) but contains a format error or
is otherwise unacceptable then the SSND initiates a connection release procedure (diagnostic codes that may apply
include 34, 38, 39, 67, 68, 69, 225-230).
Annex 10 - Aeronautical Xelecommunications Volume ZZZ
Table 4-23. SSNDPX actions - data transfer and connection release states
CONNECTION Action: Error send Action: Discard Action: Error send
REQUEST CONNECTION CONNECTION
RELEASED RELEASED
D = 0001 0111 D=OOOl 1010
(see Note I )
(extend dear to IWF)
SNPDU received from
remote SSNDPX
CONNECTION Action: Error send Action: Discard Action: Error send
CONRRM CONNECTION CONNECTION
RELEASED RELEASED
D = 0001 011 1 D = 0001 1010
(see Note 1)
(extend clear to IWF)
CONNECTION Action: Error send Action: Normal Action: Error send
RELEASE COMPLETE CONNECTION CONNECTION
RELEASED RELEASED
D = 0001 011 1 D = 0001 1010
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