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(extend clear to I W )
(see Note 1)
Data transfer and call clearing states
CONNECTION Action: Normal Action: Normal (do not Action: Discard
RELEASED (forward to IWF) forward to IWF)
Data transfer I Local clear request*
DATA, INTERRUPT, See Table 4-24 Action: Discard Action: Error send
INTERRUPT CONNECTION
CONFIRM, RESET, RELEASED
RESET CONFIRM, D = 0001 1010
FLOW CONTROL
Remote clear request
* Internal clear (at connection establishment) or clear requested by the WF
NOTES:
1. The clearing cause field is equal to 147, i.e. SSND local link error.
2. If the SNPDU is acceptable to the state of the logical channel ( i t . Action = Normal) but contains a format error,
then the SSND initiates a connection release procedure (diagnostic codes that may apply include 38, 39).
Annex 10 - Aeronautical Telecommunications
Table 4-24. SSNDPX actions - data transfer states
Data transfer states
SNPDU received from
remote SSNDPX Flow control 1 Local reset request 1 Remote reset request
Action: Normal Action: Normal (do
not forward)
RESET CONFIRM
INTERRLrPT
INTERRUPT
CONFIRM
DATA with valid
SNPDU No.
DATA with invalid
SNPDU No.
(unrecoverable)
FLOW CONTROL
(suspend) with valid
SNPDU No. or flow
control (resume)
FLOW CONTROL
(suspend) with invalid
SNPDU No.
Action: Error send RESET SNPDU
D 3 0001 1 01 1 (extend reset to IWF)
No remote interrupt Remote interrupt
pending: ongoing:
Action: Normal Action: Error send
RESET SNPDU
D=OO1O 1100
(extend reset to IWF)
No local interrupt Local interrupr
pending: ongoing:
Action: Error send Action: Normal
RESET SNPDU
D = 0010 1011
(extend resct to IWF)
Action: Normal (if flow control ready) or
Action: Discard (if flow control not ready)
Action: Error send RESET SNPDU
D = 0000 0001 (extend reset to IWF) or
Action: Discard (if l7ow control not ready)
Action: Normal
Action: Error send RESET SNPDU
D = 0000 0001 (extend reset to IWF)
Action: Normal (do
not forward)
Action: Discard
Action: Discard
Action: Discard
Action: Discard
Action: Discard
Aclion: Discard
Action: Discard
Action: Error send
RESET SNPDU
D = 0001 1101
Action: Error, send
RESET SNPDU
D = m1 1101
Action: Error, send
RESET SNPDU
D = 0001 1101
Action: Error send
RESET SNPDU
D = 0001 1101
Action: Error send
RESET SNPDU
D = 0001 1101
Action: Error send
RESET SNPDU
D=0001 1101
Action: Error send
FUZSET SNPDU
ID = 0001 1101
1 NOTES: I
1. In cases where the SNPDU is not acceptable to the state of the logical channel ( i t . Action = Error), the resetting cause field is
equal to 133, i.e. SSND local link crror.
2. If the SNDPU is acceptable to the state of the logical channel (i.e. Action = Normal) but contains a fomat error, then the SSND
initiates a connection reset procedure (diagnostic codes that may apply include 1, 38, 39).
Annex 10 - Aeronautical Telecommunications
Table 4-25. Summary of link interface data units and parameters
Direction LIDU name Parameters
From the subnetwork layer Data GES ID (in AES) or AES ID (in GES)
to the link layer RLS
Q number
LSDU
From the link layer to Data GES ID (in AES) or AES ID (in GES)
the subnetwork layer RLS
Q number
LSDU
Transmission status RLS
indication SuccessFail
First two octets of LSDU
Volume IZZ
Part Z Annex 10 - Aeronuuticul Telecommunications
Table 4-26. Subnetwork connection priority mapping
Unspecified
Categories of messages
Reserved
Distress communications, urgent
communications, networWsystems
management
PrioritylQ number mapping
Reserved '
Reserved
SNC priority in
INCOMING CALLICALL
CONNECTED packct
SNC priority in CALL
REQ UBSTICALL
ACCEPTED packer
Communications relating to direction
finding, flight safety messages
Q number
Reserved
Reserved
Meteorological communications
Flight regularity communications I
Aeronautical information services messages
Aeronautical administrative messages,
nerworldsy stems administration 1
Reserved 1
Urgent priority administrative and UN
Charter communications
High priority administrative and
State/Govemment communications
InvalidJreject call
14
None
Not applicable
14
Invalidrcjecr call
Invalidreject call
I I
Invalid/reject call
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