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3. Table entries arc defined as follows: A = action to bc taken, S = the state to be entered, D = the diagnostic code to be used in packets
generated as a result of this action, DISCARD indicates that the received packet is to be cleared for the XDLP buffers, and INVALID
indicates that the packetlstate combination cannot occur.
4. The number in parentheses below an "A = NORMAL" table entry is the paragraph number in this document that defines h e actions to be
taken to perform normal processing on the received packet. If no paragraph number is referenced, the normal processing is defined in thc
table entry.
5. The error procedure consists of performing the specified actions wbcn entering the d3 state (which includes forwarding a RESET REQUEST
packet to the peer XDLP) and sending a RESET REQUEST packet to the DCE (via the reformatting process).
6. User data length for INTERRUPT packets greater than 32 bytes, or an out of sequence INTERRUPT packet, are considered as errors.
Anrzex I0 - Aervnuulicul Telecommunications Vvlume I11
Table 5-19. GDLP (ADLP) effect on ADCE (GDCE) flow control transfer states
Packet received from GDLP (ADLP)
(sce Note 2)
ADCE (GDCE) flow control transfer states
(see Notes I, 6 and 7)
ADCE (GDCE) ADCE (GDCE)
RECEIVE READY RECElVE NOT READY
P .P
DATA packet with invalid PK A= ERROR A= ERROR
(see Note 3) S=d3 S=d3
D=2 D=2
(see Note 8) (see Note 8)
DATA packet with valid PR, invalid PS or LV A=DISCARD, A=DISCARD, but process the PR value
subfield but process the PR value and and send REJECT packet
(see Notes 4 & 5) send REJECT packet contaming the containing the cxpccted PS
expected PS value (see Note 5) value when busy condition ends
DATA packet with valid PR, PS and LV subfield A=NORMAL A=PROCESS, if possible; or
(5.2.6.4.4) A=DISCARD, but process the
(forward) PR value and send REJECT
containing the expected PS value when
busy condition ends
Packet reccivcd from GDLP (ADLP)
(see Note 2)
ADCE (GDCE) flow control transfer states
(see Notes I, 6 and 7)
GDLP (ADLP) GDLP (ADLP)
RECEIVE READY RECEIVE NOT READY
g 1 g2
RR, RNR, REJECT packet with invalid PR A=ERROR A=ERROR
(see Note 3) S=d3 S=d3
D=2 0 = 2
(see Note 8) (see Note 8)
RR with valid PR field A=NORMAL A=NORMAL
(see Note 9) (5.2.6.5) (5.2.6.6)
S=gl
RNR with valid PR value A=NORMAL A=NORMAL
(see Note 9) (5.2.6.5) (5.2.6.6)
S=g2
REJECT with valid PR A=NORMAL A=NORMAL
(sec Note 9) (5.2.6.5) (5.2.6.6)
S=g l
NOTES:
I. The XDCE is not necessarily in the same state as the DTE/DCE interface.
2. All packets from thc peer XDLP have been checked for duplication berore evaluation as represented by this table.
3. An invalid PR valuc is one which is less than the PR value (modulo 16) or the last packet sent by the peer XDLP, or greater than the PS
value of the next data packet to be transmitted by the XDLP.
4. An invalid PS value is one which is diffcrent froin the next expected value for PS.
5. An invalid LV subtlcld is one which represents a value that is too large for the size of the segment reccivcd. In the event of an LV field
error which gives rise to a loss of confidence in the correctness of thc othcr fields in thc packet, the packet is discarded without any further
aclion.
6. Table entries are defined as follows: A = action to be taken, S = the state lo be entered, D = the diagnostic codc to be 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 thc packct/statc combination cannot occur.
Part I Annex 10 - Aeronautical Telecommunicatiuns
7. The number in parentheses below an "A = NORMAL" table entry is the paragraph number in his document that defines thc actions to be
taken to perform normal processing on the receivcd packet. If no paragraph number is referenced, the nomal processing is defined in the
table entry.
8. The error procedure consists of performing the specified actions when entering the d3 state (which includes forwarding a RESET
REQUEST packet to the peer XDLP) and sending a RESET REQUEST packet to the DCE (via the reformatting process).
9. RR, RNR, and REJECT packets have no end-to-end significance and are not forwarded to the DCE.
10. The receipt of a packet smaller than the maximum packet size with M-bit = I shall cause a reset to be gcnerated and the remainder of the
sequence shall be discarded.
Table 5-20. DCE effect on ADCE (GDCE) call setup and clearing states
28/11/02
No. 77
Packet received
from DCE
(see Notes 2 & 4)
ADCE (GDCE) call setup and clcaring states (see Notes 1, 7 and 8)
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