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control procedures. An interrupt packet shall be delivered to
the DTE (or the transponder or interrogator interface) at or
bcfore the point in the stream of data at which the intermpt
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 cleal; reset, and restart procedures can
cause interrupt datu to be lost.
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).
5.2.6.6 RECEIVEN OT READY PROCEDURE
5.2.6.6.1 The Mode S RECEIVE NOT READY packet
shall be used to indicate a temporary inability to accept
additional DATA packets for the given SVC. The Mode S
RNR condition shall be cleared by the receipt of a Mode S RR
packet or a Mode S REJECT packet.
5.2.6.6.2 When the XDCE receives aMode S RECEIVE
NOT READY packet from the peer XDCE, it shall update its
value of PR for the SVC and stop transmitting Mode S DATA
packets on the SVC to the XDLF! The XDCE shall go into the
AaLP(GDLP) RECEIVE NOT READY state (g2).
5.2.6.6.3 The XDCE shall transmit a Mode S RECEIVE
NOT READY packet to the peer XDCE if it is unable to
receive from the peer XDCE any more Mode S DATA packets
on the indicated SVC. Under these conditions, the XDCE shall
go into the ADCE(GDCE) RECEIVE NOT READY state @).
5.2.6.7 RESET PROCEDURE
5.2.6.7.1 When the XDCE receives a Mode S RESET
REQUEST packct 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:
5/11/98
No. 73
Annex 10 - Aeronautical Telecommunications Volume III
a) those Mode S DATA packets that have been transmitted
to the peer XDCE shall be removed from the
window;
b) those Mode S DATA packets that are not transmitted
to the peer XDCE but are contained in an M-bit
sequence for which some packets have been transmitted
shall be deleted from the queue of DATA
packets awaiting transmission;
c) those Mode S DATA packets received from the peer
XDCE that are part of an incomplete M-bit sequence
shall be discarded;
d) the lower window edge shall be set to 0 and the next
packet sent shall have a sequence number (PS) of 0;
the digeretat delivery tinzes. The order may also be lost if
multipIe interrogators are used to deliver frames for the same
SVC to a given XDLI? The following procedure will correct
for a limited arnoztnt of desequencing.
Note 2.- This process serves as an- interface between
frame processing and the XDCE finction.
5.2.6.9.1 Resequencing. Resequencing shall be performed
independently for the uplink and downlink transfers of
each Mode S SVC. The following variables and parameters
shall be used:
SNR A 6-bit variable indicating the sequence number of
a received packet on a specific SVC. It is contained
in the SN field of the packet (5.2.5.2.1.1.7).
NESN The next expected sequence number following a
e) any outstanding Mode S MTERRUR packets to or series of consecutive sequence numbers.
from the peer XDCE shall be left unconfirmed: md
HWR The highest value of SNR in the resequencing
.F) any Mode S lNTERRUl"P packet awaiting transfer window.
shall be discarded.
Tq Resequencing timers (see Tables 5-1 and 5-13)
5.2.6.7.2 The reset procedure shall apply to the DATA associated with a specific SVC.
TRANSFER state (p4). In any other spate the reset procedure
shall be abandoned. All operations involving the sequence number (SN) shall be
performed modulo 64.
5.2.6.8 REJECTP ROCEDURE
5.2.6.8.1 When the XDCE receives a Mode S DATA
packet from the peer XDCE with incorrect format or whose
packet sequence number (PS) is not within the defined
window (Table 5-19) or is out of sequence, it shall discard the
received packet and send a Mode S REJECT packet to the
peer XDCE via frame processing. The Mode S REJECT
packet shall indicate a value of PR for which retransmission
of the Mode S DATA packets is to begin. The XDCE shall
discard subsequent out-of sequence Mode S DATA packets
whose receipt occurs while the Mode S REJECT packet
rcsponse is still outstanding.
5.2.6.8.2 When the XDCE receives a Mode S RHECT
packet from the pcer XDCE, it shall update its lower window
value with the new value of PR and begin to (re)transrnit
packets with a sequence number of PR.
5.2.6.8.3 Reject indications shall not be transferred to
the DCE. If the IS0 8208 interface supports the reject procedures,
the reject indications occuning on the IS0 8208 interface
shall not be transferred between the DCE and the XDCE.
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