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(incomplete) SU set and shall acknowledge as specified in
4.6.4.3.3.
4.6.4.3.5 The GES shall respond to a request for
acknowledgement (RQA) SU received from the AES by
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retransmitting the latest previously sent set of TACK SUs
corresponding to the SU set indicated in the RQA SU. If the
RQA SU identifies an SU set awiiting completion at the GES
and for which no TACK SU has been transmitted, the GES
shall send a TACK SU requesting the retransmissions of the
missing SUs. If the RQA SU identifies an SU set not received
at the GES, the GES shall send a TACK SU requesting the
retransmission of the entire SU set.
available for assignment before the release has been assigned.
The assigned reference number shall be used by both the T
channel transmission protocol and the T channel reservation
protocol.
4.6.5.2.3 To rcquest a reservation for the transmission of
an SU set, the AES shall send a reservation request (REQ) SU
to the GES indicating the reference number, Q number and the
length of the SU set to be transmitted.
4.6.4.3.6 If the GES receives an ISU with the same AES
ID and Q number as those of an SU set awaiting completion
and with a reference number equal to the reference number
4.6.5.2.4 The AES shall transmit a REQ SU on the R
channel (Appendix 2 to Chapter 4, Figure A2-47) or on the T paired with the reference number of the SU set according to
channel (Appendix 2 to Chapter 4, Figure A2-7) to {he GES in
the pairing scheme given in 4.6.5.2.2, the GES shall discard
the awaiting SU set. accordance with the following criterion:
The T channel shall be used if the AES is currently
transmitting a T channel burst and there is enough room to
accommodate the REQ SU or if there is a T channel burst
4.6.5 T channel reservation protocol due to start in the next 8-second time window: otherwise,
the R channel shall be used.
Note.- In 4.6.5. the use of the terms "AES" and "GES"
refer to the link layer functions for the T channel reservation 4.6.5.2,.5 When the T channcl is used for transmitting a
protocol within the AES and the GES. REQ SU to the GES, the requested length shall be increased
by one SU.
The link layer functions for the T channel resewation protocol
shall be as defined in 4.6.5.2 and 4.6.5.3.
4.6.5.2 AIRCRAFETA RTH STATION (AES)
4.6.5.2.1 Upon receipt of an LIDU containing an LSDU
exceeding 33 octets, the AES shall route the LLDU to the T
channel protocol.
Note.- An LIDU containing an LSDU of 33 octets or
less may be routed to R channel protocol or T channel
protocol.
4.6.5.2.2 Before passing the LIDU to the T channel
transmission protocol, the AES shall assign an available (not
cumently assigned) reference number (Appendix 3 to Chapter
4, Item 46) to it. If a reference number is not assigned to
m LIDU, the LIDU shall be stored until one is assigned to it.
Each assignment of a reference number shall be to the oldest
received LDU witliout a reference number. The reference
numbers for assignment to T channel D U s shall be defined
in pairs as (0,l); (2,3); (45); (6,7); (8.9); (10,ll); (12.13);
(14,lS). Once released, a reference number from a pair shall
not be reassigned until the other number from the pair has
been assigned and released. The AES shall not assign a
reference number from a pair whose other number has just
been released until a reference number from each pair that was
4.6.5.2.6 After sending a REQ SU LO the GES, the AES
shall do the following:
a) If the T channel was used for a REQ SU transmission,
and neither a corresponding reservation (RES) SU
(Appendix 2 to Chapter 4, Figure A2-23) nor a
corresponding reservation forthcoming (RFC) SU
(Appendix 2 to Chapter 4, Figure A2-24) is received
from the GES withilt tA6 seconds (Appendix 4 to
Chapter 4) from the time the REQ SU was sent on the
T channel, the AES shall send the REQ SU again on the
T or R channel, in accordance with 4.6.5.2.4, with the
requested transmission length equal to the length last
requested or incremented by one if T channel is used.
The AES shall then proceed as in 4.6.5.2.6.
b) If the R channel was used for the REQ SU transmission,
and neither a corresponding RES SU nor a
corresponding RFC SU is received from the GES within
tA7 seconds (Appendix 4 to Chapter 4) from the time
the REQ SU was sent on the R channel, the AES shall
command the selection of an R channel frequency and
send the REQ SU again on the T or R channel, in
accordance with 4.6.5.2.4, with the requested transmission
length equal to the length last requested or
　
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