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requirements do not specia format definitions andflow control
on the DTWDCE interface. The spec$cations and dejinitions
in IS0 8208 apply for these cases.
5.2.4.1 State transitions. The DCE shall operate as a
state machine. Upon entering a state, the DCE shall perform
the actions specified in Table 5-2. State transitions and
additional action(s) shall be as specified in Table 5-3 through
Tabla 5-12.
Note.- The next state transition (ifany) that occurs when
the DCE receives a packet fmm the DTE is spec$ed by
Table 5-3 through Table 5-8. These tables are organized
according to the hierarchy illustrated in Figure 5-2. The same
transitions are defined in Table 5-9 through Table 5-12 when
the DCE receives a packet from the XDCE (via the
reformatting process).
5.2.4.2 DISPOSITION OF PACKETS
5.2.4.2.1 Upon receipt of a packet from the DTE, the
packet shall be forwarded or not forwarded to the XDCE (via
Part I Annex 10 - Aeronautical Telecommunications
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 packet 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 instruction indicates
"do not forward, the packet shall be discarded.
5.2.5.1.1.2 GDLP bufer requirements
5.2.5.1.1.2.1 Recommendation.- The GDLP should be
capable of maintaining sufSicient bufSer space for an average
of 4 SVCs for each Mode S aircrafi in the coverage area of
the interrogators connected to it, assuming all aircraft have
ELM capability.
Note.- Additional bufSer space m y be required if DTEs
associated with end-systems are supported.
5.2.5 Mode S packet layer processing
5.2.5.1.2.1 The XDLP shall maintain several SVC
5.2.5.1 GENERARLE QUIREMENTS
5.2.5.1.1 BUFFER REQUIREMENTS
channel number pools; the D'I'IYXE (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 ADCHGDCE interface.
5.2.5.1.1.1 ADLP bufSer requirements
5.2.5.1.2.2 The GDLP shall mana-g e a pool of temporary -
5.2.5.1.1.1.1 The following requirements apply to the channel numbers in the range of 1 to 3, for each ground
entire ADLP and shall be interpreted as necessary for each of DTWADLP pair. Mode S CALL REQUEST packets generated
the main processes (DCE, reformatting, ADCE, frame process- by the GDLP shall contain the ground DTE address and a
ing and SSE). temporary channel number allocated from the pool of that
ground DTE. The GDLP shall not reuse a temporary channel
5.2.5.1.1.1.2 The ADLP shall be capable of maintaining number allocated to an SVC that is still in the CALL
sufficient buffer space for sixteen SVCs: REQUEST state.
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;
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 thirty-one 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; 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 be shared among
all MSPs.
Note I.- The use of temporary channel numbers allows
the GDLP to hove up to three call requests in qrocess at the
same time for a particular ground DTE and ADLP combination.
It also allows the GDLP or ADLP to clear a channel
before the permanent channel number is assigned.
Note 2.- The ADLP may be in contact with multiple
ground DTEs at any one time. All the ground DTEs use
temporary channel numbers ranging from 1 to 3.
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