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be numbered zero. Subsequent packets shall be numbered
consecutively.
5.2.6.4.4.2 A source of Mode S DATA packets (the
ADCE or GDCE) shall not send (without permission from the
receiver) more Mode S DATA packets than would fill. the
flow control window. The receiver shall give explicit permission
to send more packets.
5.2.6.4.4.3 The permission information shall be in the
form of the next expected packet sequence number, and shall
be denoted PR. If a receiver wishes to update the window and
it has data to transmit to the sender, a Mode S DATA packet
shall be used for information transfer. If the window must be
updated and no data is to be sent, a Mode S RECEIVE
READY (RR) or Mode S RECEIVE NOT READY (RNR)
packet shall be sent. At this point, the "sliding window" shall
be moved to begin at the new PR value. The XDCE shall now
be authorized to transfer more packets without acknowledgement
up to the window limit.
b) out of sequence; or
c) not equal to 0 for the first data packet after entering
FLOW CONTROL READY state (dl);
shall be considered an error (5.2.6.8).
5.2.6.4.4.6 The receipt of a Mode S DATA packet with
a valid PS number (i.e. the next PS in sequence) shall cause
the lower window PR to be changed to that PS value plus 1.
The packet receive sequence number (PR) shall be conveyed
to the originating XDLP by a Mode S DATA, RECEIVE
READY, RECEIVE NOT READY, or REJECT packet. A
valid PR value shall be transmitted by the XaCE to the peer
XDCE after the receipt of 8 packets provided that sufficient
buffer space exists to store 15 packets. Incrementing the PR
and PS fields shall be performed using modulo 16 arithmetic.
Note.- The loss of a packet which contains the PR value
may cause the ADLP/GDLP operations for that SVC to cease.
5.2.6.4.4.7 A copy of a packet shall be retained until the
user data has been successfully transferred. Following successful
transfer, the PS value shall be updated.
5.2.6.4.4.8 The PR value for user data shall be updated
as soon as the required buffer space for the window (as
determined by flow control management) is available within
the DCE.
5.2.6.4.4.9 Flow control management shall be provided
between the DCE and XDCE.
5.2.6.4.5 INTERRUPRPOTCE DURES FOR
SWITCHED VIRTUAL CIRCUITS
5.2.6.4.5.1 If user data is to be sent via the Mode S
subnetwork without following the flow control procedures, the
intermpt procedures shall be used. The interrupt procedure
shall have no effect on the normal data packet and flow
control procedures. An intermpt packet shall be delivered to
7111196
No. 71
Part I Annex 10 - Aeronautical Telecommunications
the DTE (or the transponder or interrogator interface) at or
before the point in the stream of data at which the interrupt
was generated. The processing of a Mode S INTERRUPT
packet shall occur as soon as it is received by the XDCE.
Note.- The use of clear; reset, and restart procedures can
cause interrupt data to be lost.
5.2.6.4.5.2 The XDCE shall treat an S-bit sequence of
Mode S INTERRUFT packets as a single entity.
5.2.6.4.5.3 Interrupt processing shall have precedence
over any other processing for the SVC occurring at the time
of the interrupt.
5.2.6.4.5.4 The reception of a Mode S INTERRUPT
packet before the previous interrupt of the SVC has been
confirmed (by the receipt of a Mode S INTERRUPT
CONFIRMATION packet) shall be defined as an error.
5.2.6.5 RECEIVERE ADY PROCEDURE
5.2.6.5.1 The Mode S RECEIVE READY packet shall
be sent if no Mode S DATA packets (that normally contain
the updated PR value) are available for transmittal and it is
necessary to transfer the latest PR value. It also shall be sent
to terminate a receiver not ready condition.
5.2.6.5.2 Receipt of the Mode S RECEIVE READY
packet by the XDCE shall cause the XDCE to update its value
of PR for the outgoing SVC. It shall not be taken as a demand
for retransmission of packets that have already been transmitted
and are still in the window.
5.2.6.5.3 Upon receipt of the Mode S RECEIVE
READY packet, the XDCE shall go into the ADLP(GDLP)
RECEIVE READY state (gl).
on the indicated SVC. Under these conditions, the XDCE shall
go into the ADCE(GDCE) RECEIVE NOT READY state fl).
5.2.6.7 RESET PROCEDURE
5.2.6.7.1 When the XDCE receives a Mode S RESET
REQUEST packet from either the peer XDCE or the DCE (via
the reformatting process) or due to an error condition performs
its own reset, the following actions shall be taken:
a) those Mode S DATA packets that have been transmitted
to the peer XDCE shall be removed from the
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