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capable of maintaining sufFcient buffer space for an average
of 4 SVCs for each Mode S aircraft in the coverage area of
the interrogators connected to it, assuming all aircrafr have
ELM capability.
Note.- Additional buffer space may be required if DTEs
associated with end-systems are supported.
5.2.5 Mode S packet layer processing 5.2.5.1.2 CHANNEL NUMBER POOLS
5.2.5.1 GENERALRE QUIREMENTS
5.2.5.1 -1.1 ADLP buffer requirements
5.2.5.1 .l. 1.1 The following requirements apply to the
entire ADLP and shall be interpreted as necessary for each of
the main processes (DCE, reformatting, ADCE, frame proccssing
and SSE).
5.2.5.1.1.1.2 The ADLP shall be capable of maintaining
sufficient 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 thc downlink
direction per SVC for a transponder with downlink
ELM capability or 28 bytes otherwise;
5.2.5.1.2.1 The XDLP shall maintain several SVC
channel numbcr pools; the DTFJDCE (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 AWWGDCE interface.
5.2.5.1.2.2 The GDLP shall manage apool of temporary
channel numbers in the range of 1 to 3, for each ground
DTEIADLP pair. Mode S CALL REQUEST packets generated
by the GDLP shall contain the ground DTE address and a
temporary channel number allocated from the pool of that
ground DTE. The GDLP shall not reuse a temporary channel
number allocated to an SVC that is still in the CALL
REQUEST state.
Note I.- The use of temporary channel numbers allows
the GDLP to have up to three call requests in process at the
same time for a particular ground DTE and ADLP combination.
It also allows the GDEP 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 I to 3.
5ilU98
No. 73
Annex 10 - Aeronautical Telecommunications Volume 111
5.2.5.1.2.3 The ADLP shall use the ground DTE address
to distinguish the temporary channel numbers used by the
various ground DTEs. The D L P shall assign a permanent
channel number (in the range of 1 to 15) to all SVCs and shall
inform the 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 ADEP
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 @4) state, a Mode S CALL REQUEST by GDLP
packet is received bearing the same temporary channel
number. A temporary channel number of zero in the Mode S
CLEAR FEQUEST by ADLP, CLEAR REQUEST by GDLP
or CLEAR CONFTRMATION by ADLP packet shall indicate
that the permanent channel number is to be used. 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.
In the event that an XDLP is required to send one of thcse
packets in the absence of a permanent channel number, the
permanent channcl number shall be set to zero, which shall
indicate to the peer XDLP that the temporary channel number
is to be used.
Note.- The use of a zero permanent channel number
allows the ADLP to clear an SVC when no permanent channel
number is available, and allows tlze GULP to do likewise
before it has been injorrned ofthe pennanent channel number.
5.2.5.1.2.4 The channel number used by the DTElDCE
interface and that used by the ADCEIGDCE interface shall be
assigned independently. The reformatting process shall maintain
an association table between the DTE/DCE and the
ADCEIGDCE channel numbers.
5.2.5.1.3 Receive ready and receive not ready conditions.
The IS0 8208 interface and the ADCElGDCE interface
management procedures shall be independent operations
since each system must be able to respond to separate receive
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