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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;
e) any outstanding Mode S INTERRUE packets to or
from the peer XDCE shall be left unconfirmed; and
f) any Mode S INTERRUPT packet awaiting transfer
shall be discarded.
5.2.6.7.2 The reset procedure shall apply to the DATA
TRANSFER state @4). In any other state the reset procedure
shall be abandoned.
5.2.6.8 REJECTP ROCEDURE
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 a Mode 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 XDLP. The XDCE shall go into the
ADLP(GDLP) RECEIVE NOT READY state (g2).
5.2.6.6.3 The XDCE shall transmit a Mode S RECEIVE
NOT READY packet to thc peer XDCE if it is unable to
receive from the peer XDCE any more Mode S DATA packets
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 RESECT packet
response is still outstanding.
5.2.6.8.2 When the XDCE receives a Mode S REJECT
packet from the peer XDCE, it shall update its lower window
value with the new value of PR and begin to (re)transmit
packets with a sequence number of PR.
7/11/96
No. 71
Annex I0 - Aeronautical Telecommunications Volume I21
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 occurring on the IS0 8208
interface shall not be transferred between the DCE and the
XDCE.
5.2.6.9 PACKET RRESQUENCING AND
DUPLICATE SUPPRESSION
Note 1.- the frames for an SVC include both types
(SLM und ELM), the sequence of packets may be lost due to
the dflerent delivery times. The order may also be lost if
multiple interrogutors are used to deliver framesfor the same
SVC to a given XDLP The following procedure will correct
for a limited amount of desequencing.
Note 2.- This process serves u . a~n interj$ice between
frume processirig and the XDCE furictiori.
5,269.1 Resequencing. Resequencing shall bc 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 ncxt expected sequence number following a
series of consecutive sequence numbers.
HSNR The highest value of SNR in the resequencing
window.
Tq Resequencing timers (see Tables 5-1 and 5-13)
associated with a specific SVC.
All operations involving the sequence number (SN) shall be
performed modulo 64.
5.2.6.9.2 Dupficatian window. The range of SNR values
between NESN - 32 and NESN - 1 inclusive shall be denoted
the duplication window.
5.2.6.9.3 Resequencirig window. The range of SNR
values between NESN + 1 and NESN + 31 inclusive shall be
denoted the resequencing window. Received packets with a
scqucnce numbcr value in this range shall be stored in the
resequencing window in sequence number order.
5.2.6.9.4 TRANSMISSIFOUNNC TIONS
5.2.6.9.4.1 For each SVC, the first packet sent to
establish a connection (the first Mode S CALL REQUEST or
first Mode S CALL ACCER packet) shall. cause the value of
the SN field to be initialized to zero. The value of the SN field
shall be incremented after the transmission (or retransmission)
　
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