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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 temporay channel numbers allows the
GDLP to hove up to three call requests in process 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.
number is available, and allows the GDLP to do likewise
before it has been informed of the permanent channel number:
5.2.5.1.2.4 The channel number used by the DTEDCE
interface and that used by the ADCE/GDCE interface shall be
assigned independently. The reformatting process shall
maintain an association table between the DTElDCE and Lhe
ADCWGDCE channel numbers.
5.2.5.1.3 Receive ready and receive not ready conditions.
The IS0 8208 interface and the ADCWGDCE interface
management procedures shall be independent operations since
each system must be able to respond to separate receive ready
and receive not ready indications.
5.2.5.1.4 PROCESSING OF M-BIT AND S-BIT SEQUENCES
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
and INTERRUPT packets.
5.2.5.1.4.1 M-bit processing
Note.- The packet size used on the DTE/DCE inte$ace can
be direrent from that used on the ADCEDCE intedace.
Note 2.- The ADLP may be in contact with multiple 5.2.5.1.4.1.1 M-bit processing shall be used when
ground DTEs at any one time. All the ground DTEs use DATA packets are reformatted (5.2.5.2). M-bit processing
temporaly channel numbers ranging from I to 3. shall utilize the specifications contained in thc IS0 8208
Annex 10 - Aeronautical Telecommunications Volume 111
standard. The M-bit sequence processing shall apply on a per
channel basis. The M-bit set to 1 shall indicate that a user data
field continues in the subsequent DATA packet. Subsequent
packets in an M-bit sequence shall use the same header format
(i.c. lhe packet format excluding the user data field).
5.2.5.1.4.1.2 If the packet size for the XDCE (5.2.6.4.2)
interface is larger than that used on the DTEDCE interface,
packets shall be combined to the extent possible as dictated by
the M-bit, when transmitting a Mode S DATA packet. If the
packet size is smaller on the XDCE interface than that defined
on the DTEDCE interface, packets shall be fragmented to fit
into the smaller Mode S packet using M-bit assembly.
5.2.5.1.4.1.3 A packet shall be combined with subsequent
packets if the packet is filled and more packets exist in the
M-bit sequence (M-bit = 1). A packet smaller than the
maximum packet size defined for this SVC (partial packet)
shall only be allowed when the M-bit indicates the end of an
M-bit sequence. A received packet smaller than the maximum
packet size with M-bit equal to 1 shall cause a reset to be
generated as specified in IS0 8208 and the remainder of the
sequence should be discarded.
5.2.5.1.4.1.4 Recommendation.- In order to decrease
delivery delay, reformatting should be pevormed orz the
partial receipt of an M-bit sequence, rather than delay
reformafting until the complete M-bit sequence is received.
5.2.5.1.4.2 S-bit processing. S-bit processing shall apply
only to Mode S CALL REQUEST, CALL ACCEPT, CLEAR
REQUEST and INTERRUPT packets. This processing shall be
performed as specified for M-bit processing (5.2.5.1.4.1)
exccpt 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 (5.2.6.3.6, 5.2.6.4.5.2 and
5.2.6.9), and receipt of a packet shorter than the maximum
packet size with S = 1 shall cause the entire S-bit sequence to
be treated as a format error in accordance with Table 5-16.
5.2.5.1.5 MODE S SUBNETWORK ERROR PROCESSING
FOR [SO 8208 PACKETS
5.2.5.1.5.1 D-bit. If the XDLP receives a DATA packet
with the D-bit set to I, 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, the D-bit shall
be ignored by the XDLP. The D-bit of lhe corresponding
CALL ACCEPT packet shall always be set to 0. The usc of CC
is optional.
5.2.5.1.5,2 Q-bit. If the XDLP receives a DATA packet
with Lhe Q-bit set to 1, the XDLP shall send a RESET
REQUEST packet to the originating DTE containing
CC = 133 and DC = 83. The usc of CC is optional.
5.2.5.1.5.3 Invalid priority. If the XDLP receives a call
　
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