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frame reject mode (FRM). The DLE shall re-enter the ABM
only after it receives a UA (F=1) frame.
6.5.3.6.4 Sent selective reject made. When in ABM, and
aftcr transmitting a SREJ, the DLE shall enter the senl
selective reject mode (SRM). The DLE shall re-enter the ABM
only after it receives the missing INFO frames.
2/11/00
No. 75
Annex 10 - Aeronautical Telecomnrunications V01um.e ZII
6.5.3.7 USE OF THE P/F BIT the exact same Xll-RSP to every retransmission of an
W-CMD, uriless it intends to change the link status via an
The use of the P/F bit shall follow the procedures detailed in XZD-CMD (-HO, or -LCR).
IS0 4335, except as modified by 6.5.3.7.1 through 6.5.3.7.4.
6.5.3.10 Broadcast. Only XID-CMDs or UIs shall be
6-5-3.7.1 General. When a DLE receives a command broadcast. The P bit shall be set to 0 (no acknowledgement)
frame with the P bit set to 1, the F bit shall be set to 1 in the for broadcast frames.
corresponding response frame. The CIR bit in the address field
shall be referenced to resolve the ambiguity between command
and response frames. 6.5.3.11 - INFORMATION TRANSFER
6.5-3-7-2 INFO frames. After receiving an INFO a Except as noted below, the procedures for information transfer
DLE shall generate an acknowledgement within T2 seconds shall be specified by 1~~ 4335 and ISO 7809.
after detecting the end of transmission. If a valid INFO (P=l)
is received, the response shall be either an RR (F=l) or SREJ
6.5.3.1 1.1 Transmit queue management When the DLS
e(i~th=e1r )aI.nf aR Rva l(iPd= ION) FoOr S(PR=FoJ) (iFs =rOec).e ived, the response be ssuubb--llaayyeerr thoa sa uftrhaomriezse ttora ntrsamnissmsiiotn, .i tn shoaltlr awnsamit itf oqru ebuee sM shAaCll
be maintained, one for supervisory and unnumbered (XID,
6.5.3.7.3 Recommendation.- The unly time that an RR FRMR, DISC, DM, RR, SREJ) frames and the oUler for
ur SRW frame should be transmitted with P=I is when T4 (mFO and UD. While waiting for to
expirrs' The only jimes an INFO frame he bmsmit, the DLS sub-layer shall update the transmit queue,
transmitted with P=l is either when T4 expires or the transmit eliminating certain frames as specified in 6.5.3.11.1.1 through
window has closed. 6.5.3.11.1.7. If all of the frames on the DLS transmit queue are
eliminated, then the authorization to transmit shall be ignored.
6.5.3.7.4 Unnumberedframes. The P bit shall be set to 0
for UI and DISC frames. The F bit shall be set to 0 for DM
frames. Therefore, a response (e.g. UA) shall not be expected, 6.5.3.11.1.1 Eliminate redundant frumes. At most one
and if received, shall be treated as an error. RR, SREJ, DM, FRMR or retransmitted INFO (of a given
sequence n~mber) shall be queued in response to a
transmission.
6.5.3.8 UNNUMBERECDOM MAND
FRAMES COLLISIONS
When a command frame collision occurs, the entity which has
precedence shall discard the receivcd frame from its peer
entity and the peer entity shall respond as if it had never sent
its command frame.
6.5.3.8.1 DLE procedures. While waiting for a response
to an unnumbered command frame ( i s . , FRMR), a DLE
whose DLS address is lower than its peer DLE shall have
precedence.
6.5.3.8.2 LME procedures. An LME receiving a
Broadcast Wandoff shall process it regardless of what
XID-CMD it is waiting for a response. Otherwise, an LME
sending an XID-CMD (P=l) shall have precedence over an
LME sending an HD-CMD (Pd). Otherwise, an LME whose
DLS address is lower than its peer LME shall have
precedence.
6.5.3.9 XID frame. The XID frame shall be used for the
LME to establish and maintain links as defined in 6.5.4. The
originator of an X1D-CMD (P=l) frame shall retransmit the
XZD upon expiration of Timer T3 whenever no response has
been received. The receiving LME shall use the XID sequence
number and retransmission field to differentiate a
retransmission from a new XID; however, no meaning shall be
attached to a missing sequence number. An Lh4E shall send
6.5.3.11.1.2 Recommendation.- To eliminate redundant
fmmes, super,~ededfr ames in the transmit queue should be
deleted (e.g., an INFO queued in response to a TI tin~eouat nd
then an SREJ).
6.5.3.11.1.3 Recommendation.- If any INFO %frame is
received .from a peer DLE, the DLS sub-layer should update
the N(r) of all numbered frames addressed to that DLE in the
trinsmit queue, thus imymving the pmbability oJ the
acknowledgement arriving.
6.5.3.1 1.1.4 Recommendation,- To eliminate
unnecessary rerransmissions, if any numbered frame is
received from LI peer DLE, all frames in the transmit queue
that it acknowledges should be deleted. If an XID-CMDfrom
a peer LME with a lower DLS address or an XID-RSP is
　
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