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Part Z Annex 10 - Aeronautical Telecommunications
Note I.- I f a station does retrcznsmit a11 unacknowledged
I-frames after a time-out, it must be prepared to receive a
subsequent REJ fi-ame with an N(R) gmater than its send
variable V(S).
Note 2.- Since contention may occur in the case of
two-way alternate communications in ABM or ARM, the timeout
interval employed by one combined station must be greater
than that employed by the other combined station so us to
pennit contention to be resolved.
8.6.4.3.3 FCS erroc Any frame with an FCS error shall
not be accepted by the receiving station and will be discarded.
No action shall be taken by the receiving station as the result
of that frame.
8.6.4.3.4 Frame reject exception condition. A frame
reject exception condition shall be established upon the receipt
of an error-free frame which contains an invalid or unimplemented
control field, an invalid N(R), or an information field
which has exceeded thc maximum established storage capability.
If a frame reject exception condition occurs in a combined
station, the station shall either:
a) take recovery action without reporting the condition to
the remote combined station; or
b) rcport the condition to the remote combined station
with a FRMR response. The remotc station will then
be expected to take recovery action; if, after waiting
an appropriate time, no recovery action appears to
have been taken, the combined station reporting the
frame reject exception condition may take recovery
action,
Recovery action for balanced operation includes the transmission
of an implemented mode-setting command. Higher
level functions may also bc involved in the recovery.
8.6.4.3.5 Mode-setting contention. A mode-setting
contention situation exists when a combined station issues a
mode-setting command and, before receiving an appropriate
response (UA or DM), receives a mode-setting command from
the remote combined station. Contention situations shall be
resolved it1 the following manner:
a) when the send and receive mode-setting commands are
the same, each combined station shall send a UA
response at the earliest respond opportunity. Each
combined station shall either enter the indicated mode
immediately or defer entering the indicated mode until
receiving a UA response. In the latter case, if the UA
response is not received:
b) when the mode-setting commands are different, each
combined station shall enter ADM and issue a DM
response at the earliest respond opportunity. In the
case of DISC contention with a different mode-setting
command, no further action is required.
8.6.4.3.6 Time-outfunchons. Time-out functions shall be
used to detect that a required or expected acknowledging
action or response to a previously transmitted frame has not
been received. Expiration of the time-out function shall initiate
appropriate action, e.g. error recovery or reissuance of the P
bit. The duration of the following time-out functions is system
dependent and subject to bilateral agreement:
a) combined stations shall provide a time-out function to
determine that a response frame with F bit set to "1"
to a command f r e e with the P bit set to "I" has not
been received. The time-out function shall automatically
cease upon receipt of a valid frame with the
F bit set to "1";
b) a combined station which has no P bit outstanding,
and which has transmitted onc or more framcs for
which responses are anticipated shall start a time-out
function to detect the no-response condition. The timeout
function shall cease when an I- or S-frame is
received with the N(R) higher than the last received
N(R) (actually acknowledging one or more
I-frames).
8.6.5 Common ICAO data interchange
network (CIDIN)
Note.- The common ICAO data interchange network
(CIDIN) is one part of the aeronautical fived service which
uses bit-oriented procedures and packet switching techniques.
8.6.5.1 CIDIN
PROTOCOL LEVELS
8.6.5.1.1 There shall be four protocol levels defined to
control the transfer of messages between ClDLU switching
centres:
- the data link protocol level
- the X.25 packet protocol level
- the CIDIN packet protocol level
1) the mode may be entered when the response timer - the transport protocol level
expires; or
Note.- The relationship of the terms used is shown in
2) the mode-setting command may be reissued; Figures 8-1 and 8-2.
7/11/96
Nn. 71
Annex 10 - Aeronautical Telecommunications Volume 111
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