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b) buffer space not available, DC = 71, CC = 133;
c) DTE not operational, DC = 162, CC - 141; and
d) link Jailure, DC = 225, CC = 137.
5.2.6.3.3.5 If the ADLP receives a Modc S ROUTE
packet with the IN bit set to ONE, the ADLP shall perfom
local initialization by clearing Mode S SVCs associated with
the DTE addresses contained in the ROUTE packet. If the
GDLP receives a search request (Table 5-23) from an ADLP,
the GDLP shall perform local initialization by clearing Mode
S SVCs associated with that ADLP. Local initialization shall
be accomplished by:
a) releasing all allocated resources associated with these
SVCs (including the resequencing buffers);
b) returning these SVCs to the ADCE ready slate @I); and
C) sending Mode S CLEAR REQUEST packets for these
SVCs to the DCE (via the reformatting process) for
transfer to the DTE.
Note.- This acriorz will allow all IS0 8208 SVCs attached
to the Mode S SVCs to be cleared nrzd retlrrrz to their ready
StlLtCS (PI).
5.2.6.3.4 Clear confirnzation. When the XDCE receives a
Modc S CLEAR CONFIRMATION packet, the remaining
allocated resources to rnanagc the SVC shall be released
(including the rcscquencing buffers) and the SVC shall be
returned to the pl state. Mode S CLEAR CONFIRMATION
packets shall not bc transfcrrcd to thc reformatting process.
2811 1/02
No. 77
Annex 10 - Aeronautical Telecomrnurticatinrzs Vohtme I11
5.2.6.3.5 Clear collision. A clear collision occurs at the
XDCE when it receives a Mode S CLEAR REQUEST packet
lrom the DCE (via the reformatting process) and lhen receives
a Mode S CLEAR REQUEST packet from the peer XDCE (or
vice versa). In this evenl, the XDCE does not expect to receive
a Mode S CLEAR CONF'IRMATION packet for this SVC and
shall consider the clearing complete.
5.2.6.3.6 Packet processing The XDCE shall treat an Sbil
sequence o[ Mode S CALL REQUEST, CALL ACCEPT
and CLEAR REQUEST packets as a single entity.
5.2.6.4 DATA TRANSFER AND INTERRUPT PROCEDURES
5.2.6.4.1 GKNERAPLRO VISIONS
after an SVC has just entered the flow control ready state shall
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 che window must be
updated and no data are to be sent, a Mode S RECEIVE
READY (RR) or ode s RECEIVE NOT READY (RNR)
5.2.6.4.1.1 Data transfer and interrupt procedures shall packet shall be sent. At this point, the shall
to each SVC. The 'Ontents of the user be moved to begin at the new PR value. The XDCE shall now
data field shall be passed transparenlly 10 the DCE or to the be authorized to transfer more packets without
peer XDCE. Data shall be transferred in the order dictated by acknowledgement up to the window limit.
thc sequence numbers assigned to the data packets.
5.2.6.4.1.2 To transfer DATA packets, the SVC shall be in 5.2.6.4.4.4 When the sequence number (PS) of the next
a FLOW CONTROL READY state (dl). Mode S DATA packet to be sent is in the range
PR 5 PSI. PR + 14 (modulo 16), the sequence number shall
be defined to be "in the window" and the XDCE shall be
5.2.6.4.2 MODE S PACKET SIZE authorized to transmit the packet. Otherwise, the sesuence
number (PS) of the packet shall be defincd to be "outsik the
5.2.6.4.2.1 The maximum size of Mode S packets shall and the xDCE not transmit the packet to the
be 152 bytes in the uplink direction and 160 bytes in the peer X~cE.
downlink direction for installations that have full uplink and
downlink ELM capability. The maximum downlink packet size
for level four transponders with less than 16 segment downlink 5.2.6.4.4.5 When the sequence number (PS) of the packet
ELM capability shall be 10 bytes times the maximum number received is next in sequence and within the window, the XDCE
of downlink ELM segments that the transponder specifies in accept this packet. of a packet with a PS:
its data link capability report. If there is no ELM capability, the
maximum Mode S packet size shall be 28 bytes. a) outside the window; or
5.2.6.4.2.2 The Mode S subnetwork shall allow packets of b) out of sequence; or
less than the maximum size to be transferred.
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