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command, no further action is required.
8.6.4.3.6 Time-outfinctions. 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 frame 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 "I";
b) a combined station which has no P bit outstanding,
and which has transmitted one or more frames for
which responses are anticipated shall start a time-out
function to detect the no-response condition. The timea)
take recovery action without reporting the condition to out function shall cease when an I- or S-frame is
the remote combined station; or received with the N(R) higher than the last received N(R)
(actually acknowledging one or more I-frames).
b) report the condition to the remote combined station with
a FRMR response. The remote station will then be
expected to take recovery action; if, after waiting an
appropriate time, no recovery action appears to have 8.6.5 Common ICAO data interchange
been taken, the combined station reporting the frame network (CIDIN)
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 be 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 in 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
Note 1.- The common ICAO data interchange network
(CIDIN) is un element of the aeronautical Ned service (AFS)
which uses bit-oriented procedures, store and forward
techniques and packet switching techniques based on CCrfT
Recommen.dation X.25 to carry messages of specific
applications of the AFS such as AFTN and operational
meteorological information (OFMET}.
Note 2.- The CIDIN provides a reliable common network
sewice for the conveyance of application messages in binary
or text form to air trajic service providers and aircraft
operating agencies.
8.6.5.1.1 CIDIN entry and exit centres or stations shall be
used to connect application entities to the CIDIN.
response is not received:
Note.- The intevacing between CIDIN und application
entities is a matter for local implementation.
1) the mode may be entered when the response timer
expires; or 8,6.5.1.2 CIDIN relay centres shall be used to forward
packets between CIDIN entry and exit centres or stations
2) the mode-setting command may be reissued; which are not directly connected.
1111101
No. 76
Anlzex 10 - Aeronautical Teleco~r~rniir~icutiotis Volume III
Figure 8-1. CIDIN Protocol I,evels
ENTRY PVC TRANSIT RELAY EXIT
CENTRE CENTRE CENTRE CENTRE
1/11/01
No. 76
LEVEL
4
LEVEL
3b
-----------
LEVEL
3a
LEVEL
2
LEVEL
1
I I I I
-- - -- --
4
3b
> - - - - L A - - - -
3a
2
1
ClDlN
transport
protoco~
ClDlN
packet
protocol
X.25 packet
protocol
Data link
protocol
Physical
~nterface
4 b
4 b
+ L
+ b
b
4 b
4 b
Part I Annex 10 - Aeronautical Telecommunications
I - I CIDIN packet (S 256 octets) 1
I
J
I
I
1
: Communications +: I
I
:* control field CIDIN user data field I1
II
I CIDIN TRANSPORT LEVEL
r:
II
I I CIDIN PACKET LEVEL
I - I
I
I
1
I I
I
I X.25 PACKET LEVEL I
r-
I
I I I
I
I
I
I I
I DATA LINK LEVEL
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