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the reformatting process) according to the parenthetical
instructions contained in Tables 5-3 to 5-8. If no parenthetical
instruction is listed or if the parenthetical instruction indicates
"do not forward", the packet shall be discarded.
5.2.4.2.2 Upon receipt of a packct from the XDCE (via
the reformatting process), the packet shall be forwarded or not
forwarded to the DTE according to the parenthetical
instructions contained in Tables 5-9 to 5-12. If no parenthetical
instruction is listed or if the parenthetical insmction indicates
"do not forward", the packet shall be discarded.
5.2.5 Mode S packet layer processing
5.2.5.1 GENERAL REQUIREMENTS
5.2.5.1.1.1 ADLP buffer requirements
5.2.5.1.1 . I .I The following requirements apply to the
entire ADLP and shall be interpreted as necessary for each of
the main processes (DCE, reformatting, ADCE, frame
processing and SSE).
5.2.5.1.1.1.2 The ADLP shall be capable of maintaining
suficient buffer space for fifteen SVCs:
a) maintain sufficient buffer space to hold fifteen Mode S
subnetwork packets of 152 bytes each in the uplink
direction per SVC for a transponder with uplink ELM
capability or 28 bytes otherwise;
b) maintain sufficient buffer space to hold fifteen Mode S
subnetwork packets of 160 bytes each in the downlink
direction per SVC for a transponder with downlink ELM
capability or 28 bytes otherwise;
28/11/02
No. 77
Part I Annex 10 - Aeronautical Telecommunicatiorzs
c) maintain sufficient buffer space for two Mode S
subnetwork INTERRUPT packets of 35 bytes each,
(user data field plus control information), one in each
direction, for each SVC;
d) maintain sufficient resequencing buffer space for storing
~hirty-oneM ode S subnetwork packets of 152 bytes each
in the uplink direction per SVC for a transponder with
uplink ELM capability or 28 bytes otherwise; and
e) maintain sufficient buffer space for the temporary
storage of at least one Mode S packet of 160 bytes
undergoing M-bit or S-bit processing in each direction
per SVC.
5.2.5.1.1.1.3 The ADLP shall be capable of maintaining a
buffer of 1 600 bytes in each direction to bc shared among all
MSPs.
5.2.5.1.1.2 GDLP buffer requirements
5.2.5.1.2.3 The ADLP shall use the ground DTE address
to dis~inguish the temporary channel numbers used by the
various ground DTEs. The ADLP shall assign a permanent
channel number (in the range of I to 15) to all SVCs and shall
inform Lhe GDLP of the assigned number by including it in the
Mode S CALL REQUEST by ADLP or Mode S CALL
ACCEPT by ADLP packets. The temporary channel number
shall be included in the Mode S CALL ACCEPT by ADLP
together with the permanent channel number in order to define
the association of these channel numbers. The ADLP shall
continue to associate the temporary channel number with the
permanent channel number of an SVC until the SVC is
returned to the READY (pl) state, or else, while in the DATA
TRANSFER (p4) state, a Mode S CALL REQUEST by GDLP
packet is received bearing the same temporary channel
number. A non-zero permanent channel number in the Mode S
CLEAR REQUEST by ADLP, CLEAR REQUEST by GDLP,
CLEAR CONFIRMATION by ADLP or CLEAR
CONFIRMATION by GDLP packet shall indicate that the
permanent channel number shall be used and the temporary
channel number shall be ignored. h the event that an XDLP is
required to send one of these packets in the absence of a
permanent channel number, the permanent channel number
5.2.5.1.1.2.1 Recommendation.- The GDLP should be
shall be set to zero, which shall indicate to the peer XDLP that
capable of maintaining sufJicient bufer space for an average
of 4 SVCs for each Mode S aircraft in the coverage area of the
the temporary channel number is to be used.
interrogators connected to it, assuming all aircraft have ELM
Note.- The use of a zero permanent channel number
capability.
allows the ADLP to clear an SVC when no permanent channel
Note.- Additional bufler space may be required if DTEs
associated with end-systems are supported.
5.2.5.1.2 CHANNEL NUMBER POOLS
5.2.5.1.2.1 The XDLP shall maintain several SVC
channel number pools; the DTElDCE (IS0 8208) interface
uses one set. Its organization, structure and use shall be as
defined in the IS0 8208 standard. The other channel pools
shall be used on the ADCWGDCE interface.
5.2.5.1.2.2 The GDLP shall manage a pool of temporary
channel numbers in the range of 1 to 3, for each ground
DTE/ADLP pair. Mode S CALL REQUEST packets generated
by the GDLP shall contain the ground DTlE address and a
　
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