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5.2.5.1.2.3 The ADLP shall use the ground DTE address
to distinguish the temporary chimn~l numbers used by the
various ground DTEs. The ADLP shall assign a permanent
channel number (in the range of 0 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
ACCEFT 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 04) 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 REQUEST by ADLP, CLEAR REQUEST by GDLP
or CLEAR CONFIRMATION by ADLP packet shall indicate
that the permanent channel number is to be used. A non-zero
7/11/96
No. 71
Annex 10 - Aeronautical Telecommunications Volume 111
temporary channel number in these packets shall indicate that
thc temporary channel number shall be uscd and the pcrmanent
channel number shall be ignored.
5.2.5.1.2.4 The channel number used by the DTEDCE
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 rlot ready conditions.
The IS0 8208 interface and the ADCWGDCE interface
5.2.5.1.4.1.4 Recommendation.- In order to decrease
delivery delay, reform~tting should he performed on the
partial receipt of an M-bit sequence, rather than delay
reformatting until the complete M-bit sequence is received.
5.2.5.1.4.2 S-bitprocessing. S-bit processing shall apply
only to Mode S CALL REQUEST, CALL ACCEFT, CLEAR
REQUEST and INTERRUPT packets. This processing shall be
performed as specified for M-bit processing (5.2.5.1.4.1)
except that the packets associated with any S-bit sequence
whose reassembly is not completed in Tq seconds (Tables 5-1
and 5-13) shall be discarded (5.2.6.9).
management procedures shall be independent operations since -
each system must be able to respond to separate receive ready 5.2.5.1.5 MODE S SUBNETWORK ERROR PROCESSING and receive not ready indications.
FOR Is0 8208 PACKETS
5.2.5.1.4 PROCESSING OF M-BIT
AND S-BIT SEL)UENCE,S
Note.- M-bit processing applies to the sequencing of the
DATA packet. S-bit processing applies to the sequencing of
Mode S CALL REQUEST CALL ACCEPT CLEAR REQUEST
crnd INTERRUPT packets.
5.2.5.1.4.1 M-bit processing
Note.- The packet size used on the DTWDCE inrei$ace
can be diflerentfrom that used on the ADCWGDCE interface.
5.2.5.1.4.1.1 M-bit processing shall be used when
DATA packets arc reformatted (5.2.5.2). M-bit processing
5.2.5.1.5.1 D-bit. If the XDLP receives a DATA packet
with the D-bit set to 1, the XDLP shall send a RESET
REQUEST packet to the originating DTE containing a cause
code (CC) = 133 and a diagnostic code (DC) = 166. If the
D-bit is set to 1 in a CALL REQUEST packet, it shall be
ignored by the XDLP. The D-bit of the corresponding CALL
ACCEPT packet shall always be set to 0.
5.2.5.1.5.2 Q-bit. If the XDLP receives a DATA packet
with thc Q-bit set to 1, the XDLP shall send a RESET
REQUEST packet to the originating DTE containing
CC = 133 and DC = 83.
5.2.5.1.5.3 Invalid priority. I'f the XDLP receives a call
request with a connection priority value equal to 2 through
254, the XDIB shall clear the virtual circuit using DC = 66
and CC = 131.
shall utilizc the specifications contained in the IS0 8208
standard. The M-bit sequence processing shall apply on a per 5.2.5.1.5.4 Unsupported facility. If the XDLP receives
channel basis. The M-bit set to 1 shall indicate that a user data a call request with a request for a facility that it cannot
field continues in the subsequent DATA packet. Subsequent SuPPOfl. the XDLP shall clear the virtual using
packets in an M-bit sequence shall use the same header format DC = 65 and CC = 13'.
(i.e. the packet format excluding the user data field).
5.2.5.1.5.5 Illegal calling DTE address. If the XDLP
receives a call request with an illegal calling DTE address
5+2-5A1A4L1-2 If the packet 'jze for the XDCE (5.2.6-4-2) (5.2.3.1.3.3), the XDLP shall clear the virtual circuit using
interface is larger than that used on the DTmCE interface, DC = 68 and cc = 141.
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