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received from a peer LME, any XID-Cms in the transmit
queue *for that LME should be deleted.
6.5.3.1 1.1.5 Procedures for transmission. Supervisory
frames have higher priority than the information frames, <and
so supervisory and unnumbered (XID, FRMR, TEST, DISC,
DM) frames shall be transmitted in preference to information
frames.
6.5.3.11.1.6 Recommendation.- On transmission of an
INFO frame, the DLE should also transmit any queued RR so
as to avoid transmitting the RR as a separate frame.
No. 75
Part Z Annex 10 - Aeronautical Telecommunications
6.5.3.11.1.7 Recommendation.- A station receiving a
FRMR, DISC, or DM frame should delete all outstanding
trafic for the trarzsmitting DLE as it would not be accepted if
transmitted.
6.5.3.1 1.1.8 Recommendation.- All unicast frames in
the transmit queue should be deleted afer the radio supporting
this transmit queue is retuned as the intended station cannot
receive the transmission.
6.5.3.1 1.2 SREJ frame. The multi-selective reject option in
IS0 4335 shall be used to request the retransmission of more
than one INFO frame. The SREJ (F-0) frame shall be generated
only after receipt of an out-of-order INFO (P=O). The SREJ
(F=l) shall be generated only after receipt of an INFO (P=l),
RR (P=l) or SREJ (P=l). The SREJ (P=l) frame shall be
generated only in accordance with the procedures of 6.5.3.4.4.
A DLE shall aclmowledge those frames which were' received
correctly but out of order by including in the SRET information
field an octet with bits 6-8 set to the INFO frame's sequence
number and bit 1 set to 1. Although the F bit may be set to 0,
the SREJ frame shall always acknowledge N Ofr ames up to
N(r)-1 (where N(r) is the value in the control field).
Note.- AVLC has extended the standard IS0 4335 SREJ
functiomlity to selectivety acknowledge frames. In IS0 4335,
the octets in the information field which were requesting
retransmission offrames had bit position I set by default to 0.
6.5.3.1 1.3 FRMR frame. If a DLE receives an illegal
frame (as defined by IS0 4333, it shall transmit a FRMR
(P=l) to reset the link (e.g. state variables, timers and queues).
A DLE, on receiving or transmitting a UA (F=l), shall reset
the link (no XID exchange required). A DLE shall use the
normal T1 and N2 procedures during the FRMRIUA
exchange. A DLE transmitting the FRMR shall also retransmit
the FMR either upon expiration of Timer T4 or upon receipt
of any frame other than a UA (F=l). A DLE receiving an
illegal FRMR shall either discard the frame or treat it as a valid
FRMR.
6.5.3.11.4 UA frame. The UA frame shall be used only to
acknowledge a FRMR.
6.5.3.11.5 01 frame. UI frames shall be used solely to
support connectionless data transfer required to provide
broadcast services.
6.5.3.11.6 TEST frame.
Note.- The TEST cummand/response exchange has been
included in AVLC to allow a station to perform a lauphack test
using logic that is isolated from the normal processing.
a) link provision; and
b) link change notifications.
6.5.4.1.1 Link provision. A VME shall have an LME for
each peer LME. Hence, a groundVME shall have an LME per
aircraft and an aircraft VME shall have an LME per ground
system. An LME shall establish a link between a local DLE
and a remote DLE associated with its peer LME. A ground
LME shall determine if an aircraft station is associated with its
peer aircraft LME by comparing the aircraft address; two
aircraft stations with identical aircraft addresses are associated
with the same LME. An aircraft LME shall determine if a
ground station is associated with its peer gmund LME by
bit-wise logical ANDing the DLS address with the station
ground system mask provided by the peer ground LME; two
ground stations with identical masked DLS addresses are
associated with the same LME. Each aircraft and ground LME
shall monitor all transmissions from its peer's stations to
maintain a reliable link between some ground station and the
aircraft while the aircraft is in coverage of an acceptable
ground station in the ground system.
Note.- If an aircrafl receives a frame fmm a ground
station, only one LME will process and react to that frame.
Thus the qualifiing phrase 'from a gmund station associated
with its peer LME" will not be included and should be
understood to be implied.
6.5.4.1.2 Link change not@cations. The VME shall notify
the intermediate-system system management entity (IS-SME)
of changes in link connectivity supplying information
contained in the XID frames received.
6.5.4.2 EXCHANGIED ENTITY (m)
　
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