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ADCE
(GDCE)
GDLP to GDLP
GDLP (ADLP) ADCE (GDCE) (ADLP) (ADLP)
CALL CALL DATA CLEAR CLEAR
READY REQUEST REQUEST TRANSFER REQUEST REQUEST
Pl P2 ~3 P4 P6 ~7
CALL REQUEST A=NORMAL INVALID INVALID INVALID INVALID INVALID
(see Note 6) (5.2.6.3.1) (see Note 5) (see Note 3) (see Note 3) (see Note 3) (see Note 3)
S=p3
(forward)
CALL ACCEPT A=DISCARD A=NORMAL INVALID INVALID A=DISCARD A=DISCARD
(see Note 4) S=P4 (see Note 3) (see Note 3)
(forward)
CLEAR REQUEST A=DISCARD A=NORMAL A=NORMAL A=NORMAL A=DISCARD A=DISCARD
(see Note 4) (5.2.6.3.3) (5.2.6.3.3) (5.2.6.3.3)
S=p7 S=p7 S=p7
(forward) (forward) (forward)
DATA, INTERRUPT A=DISCARD INVALID INVALID See Table A=DISCARD A=DlSCARD
or RESET packets (see Note 3) (see Notc 3) 5-21
(see Note 4)
NOTES:
I . The XDCE is not necessarily in the same state as the DTEiDCE interface.
2. This is the DTE packet received via the DCE after all DTEiDCE processing has occurred. Procedures local to the DTEIDCE interface (such
as RR, RNR, and REJECT if in effect), do not affect the XDCE directly. All error procedures as documented in IS0 8208 have been
performed. Hence certain packets are rejected by the interface and are not represented in this table.
3. The DCE in its protocol operation with the DTE will detect this error condition, hencc the erroneous packet can be said never to "reach"
the XDCE; see also Notc 2.
4. Thc channel number for the DTElDCE need not bc the same channel number used for the ADCEIGDCE; a packet from the DTE which
contains a channel number is associated with an airlground channel by means of a previously established cross-rcference table. I1 none exists
then the DTE/DCE channel by definition references an airlground channel in the pl statc.
5. Thc ADCE assigns all channel numbers used between the ADLP and GDLP; hence call collisions (denoted p5 IS0 8208) arc not possible;
sce also Note 4.
6. A CALL REQUEST from the DTE can ncver be associated with an XDCE channel number which is not in the pl state.
7. Table entries are defined as follows: A = action to be taken, S = thc state to be entered, D = the diagnostic code to be used in packets
generated as a result of this action, DISCARD indicates that the reccivcd packet is to be cleared from the XDLP buffers, and INVALID
indicates that the packetlstate combination cannot occur.
8. The number in parentheses below an "A = NORMAL" table entry is the paragraph numbcr in this document that defines the actions to bc
taken to perform 1 nomal processing on the received packet. If no paragraph number is referenced, the normal processing is defined in the table entry.
.. -
Annex ZO - Aeronuutical Telecommunications Volume ZZZ
Table 5-21. DCE effect on ADCE (GDCE) reset states
RESET CONFIRMATION
Packet received from DCE
INTERRUPT
INTERRUPT CONFIRMATION
now CONTROL
READY
dl
DATA (see Note 2)
RESET REQUEST A=NORMAL
(5.2.6.7)
s=d7
(forward)
INVALID
(see Note 3)
ADCE (GDCE) reset states
(sec Notes 1, 4 and 5)
GDLP (ADLP)
RESET REQUEST
d2
A=NORMAL
(5.2.6.7)
$=dl
(forward)
INVALID
(see Note 3)
ADCE (GDCE)
RESET
REQUEST
to GDLP (ADLP)
d3
INVALID
(see Note 3)
See Table 5-22 A=DISCARD Hold interrupt until Mode S
reset complete
See Table 5-22 A=DISCARD INVALID
(see Note 3)
A=NORMAL A=DISCARD Hold data until Mode S
(5.2.6.4) reset complete
(forward)
I. The XDCE is not necessarily in the same state as the DTE/DCE interface.
2. This is the DTE packet received via thc DCE after all DTE/DCE processing has occurred. Procedures local to the DTE/DCE interface (such
as RR, RNR, and REJECT if in effect), do not affect the XDCE directly. All error procedures as documented in IS0 8208 have been
performed. Hence ccrtain packets are rejected by the interface and are not represented in this table.
3. The DCE in its protocol operation with the DTE will detect this error condition, hence the erroneous packet can be said never to "reach"
the XDCE; scc also Note 2.
4. Table entries are defincd as follows: A = actlon to be taken, S = the state to be entered, D = the diagnostic code to he used in packets
generated as a result of this action, DISCARD indicates that the received packet is to be cleared from the XDLP buffers, and INVALID
indicates that the packetlstate combination cannot occur.
5. The number in parentheses below an "A = NORMAL" table entry is the paragraph number in this document that defines the actions to be
taken to perform normal processing on thc received packet. If no paragraph number is referenced, thc normal processing is defined in the
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