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5.2.6.4.3 FLOW CONTROL WfNDOW SIZE
5.2.6.4.3.1 The flow control window size of the Mode S
subnetwork shall be independent of that used on the DTE/DCE
interface. The Mode S subnetwork window size shall be 15
packets in the uplink and downlink directions.
5.2.6.4.4 SVC FLOW CONTROL
5.2.6.4.4.1 Flow control shall be managed by means of a
sequence number for received packets (PR) and one Lor
packets that have been sent (PS). A sequence number (PS)
shall be assigned for cach Mode S DATA packet generated by
the XDLP for each SVC. The first Mode S DATA packel
transferred by the XDCE ro hame processing when the SVC
has just entered the flow conrrol ready state shall be numbered
zero. The first Mode S packet rcccived from the peer XDCE
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 sequcnce) shall cause the
lower window PR to be changed to that PS value plus 1. The
packct receive sequcnce number (PR) shall be conveycd to the
originating XDLP by a Mode S DATA, RECEIVE READY
RECEIVE NOT READY, or REJECT packer. A valid PR value
shall be transmitted by the XDCE to the peer XDCE after lhe
receipt of 8 packets provided that sufficient buffer space exists
to store 15 packets. lncrementing the PR and PS fields shall be
performed using modulo 16 arithmetic.
Note.- The loss of a packer which contains the PR value
may calm the ADLP/GDLP operationsfor thar SVC to cease.
28/11/02
No. 77
Part l A~trlex 10 - Aeronautical Teleco~nmu~zicatio~is
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 bc updated as
soon as thc required buffer space for the window (as
determined by How 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 INTERRUPT PROCEDURES FOR SWITCHED
VIRTUAL ClKCUIii
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 interrupt packet shall be delivered to the DTE
(or ~ h ctra nsponder or interrogator interfaccj at or before the
point in the stream of data at which the intempt was
generated. The processing of a Mode S INTERRUFT packet
shall occur as soon as it is received by the XDCE.
Note.- The use of cleat; reset, and restart procedures can
cause interrupt dutu to be lost.
5.2.6.4.5.2 The XDCE shall treat an S-bit sequence of
Mode S INTERRUPT packets as a single entity.
5.2.6.4.5.3 Interrupt processing shall have precedence
over any other processing for thc SVC occurring at the time of
the intermpt.
5.2.6.4.5.4 The reception of a Mode S INTERRUPT
packet before the previous intermpt of the SVC has been
confirmed (by the receipt of a Mode S INmRRUFT
CONFIRMATION packet) shall be defined as an error. The
error results in a reset (see Table 5-18).
5.2.6.5 RECEIVER EADY PROCEDURE
5.2.6.h RECElVE NO'r READY PROCEDURE
5.2.6.6.1 The Mode S RECEIVE NOT READY packet
shall be used to indicate a temporary inability to accepi
additional DATA packets for the given SVC. The Mode S RNR
condiLion shall be cleared by the receipt ol' 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. Thc 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 the peer XDCE if it is unable to
receive from the pecr XDCE any more Mode S DATA packets
on the indicated SVC. Under these condilions, lhe XDCE shall
go into the ADCE(GDCE) RECEIVE NU'T READY state (f2j.
5.2.6.7 RESET PROCEDURE
5.2.6.7.1 When he 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 bc raken:
a) those Mode S DATA packets that have been transmitted
to the peer XDCE shall be removed from the
window;
bj those Mode S DATA packets that are not Iranslnitted to
thc peer XDCE but are contained in an M-bit sequence
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