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lower window edge, and less than or equal to the P(S)
to be assigned to the next data packet for transfer:
1) set the transfer lower window edge to equal P(R);
2) consider all unacknowledged data packets which
have been transferred with P(S) less than the new
value of the transfer lower window edge as
acknowledged and delivered to the next centre;
d) if the P(R) is not greater than or equal to the transfer
lower window edge, and not less than or equal to the
P(S) to be assigned to the next data packet for transfer:
execute the procedure for reset with the resetting cause
field indicating "local procedure error" and the
diagnostic code field indicating "invalid P(R)".
8.6.6.2.6.7.6 A centre which receives a data packet
which is less than or equal to the maximum cstablished length
for data packets, and which contains P(S) equal to the next
expected value of P(S), and which contains P(S) equal to or
beyond the receive lower window edge plus W, shall:
a) discard the data packet;
b) execute the procedure for reset, with the resetting
3) consider all unacknowledged data packets which cause field indicating "local procedure error" and the
have been transferred with P(S) less than the new diagnostic code indicating "invalid P(S)";
value of the transfer lowcr window edge as
acknowledged and delivered to the next centre; c) if the centre is a PVC transit centre for the PVC
d) if the P(R) is not greater than or equal to the transfer assigned to the logical channel, execute the procedure
lower window edge, and not less than or equal to the for reset on thc corresponding logical channel, with the
P(S) to be assigned to the next data packet for transfer: resetting cause field indicating "remote procedure
error" and the diag- nostic code indicating- "invalid
1) execute the procedure for reset with the resetting P(S)".
cause field indicating "local procedure error" and
the diagnostic code field indicating "invalid P(R)"; 8.6.6.2.6.7.7 A centre which receives a data packet
which is less than or equal to the maximum established length
2) execute the procedure for reset on the corres- for data packets, and which contains P(S) not equal to the next
ponding logical channel with the resetting cause expected value of P(S), shall:
field indicating "remote procedure error" and the
diagnostic code indicating "invalid P(R)". a) discard the data packet;
8.6.6.2.6.7.5 A PVC termination centre which receives
a data packet which is tess than or equal to the maximum
established length for data packets, and which coiitains P(S)
equal to the next expected value of P(S), and which contains
P(Sj less than the receive lower window edge plus W, shall:
a) increment its next expected value of P(S) and, if this
value diffcrs from the rcceivc lower window edge by
morc than one-half W, exechte the procedure to update
the receivc lower window edge given in 8.6.6.2.6.13;
b) execute the procedure for reset, with the resetting
cahsc field indicating "local procedure error" and the
diagnostic code indicating "invalid P(S)";
c) if the centrc is a PVC transit centre for thc PVC
assigned to the logical channel, execute the procedure
for reset on the corresponding logical channel, with the
resetting cause field indicating "remote procedure
error" and the diagnostic code indicating "invalid
P(S)".
7/11/96
No. 71
Part I Annex 10 - Aeronautical Telecommunications
8.6.6.2.6.7.8 A centre which receives a data packet
greater than the maximum established length for data packets
shall:
a) discard the data packet;
b) execute the procedure for reset, with the resetting
cause field indicating "local procedure error" and the
diagnostic code indicating "packet too long";
C) if the centre is a PVC transit centre for the PVC
assigned to the logical channel, exccute the procedure
for reset on the corresponding logical channel, with the
resetting cause field indicating "remote procedure
error" and the diagnostic code indicating "packet too
long".
8.6.6.2.6.8 Transferring RECEIVE NOT READY
8.6.6.2.6.8.1 A centre which is becoming temporarily
unable to accept further data packets shall transfer a RECEIVE
NOT READY with P(R) equal to the receive lower window
edge.
8.6.6.2.6.9 Receiving RECHVE NOT READY
8.6.6.2.6.9.1 A centre which receives a RECEIVE NOT
READY on a logical channel which is not in the flow control
ready state shall discard the RECEIVE NOT READY.
8.6.6.2.6.9.2 A centre which receives a valid RECEIVE
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