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Note 2.- T3min shall be greater than Tlmin to allow the
responding entity time to co-ordinate the response and
perform any additional initialization processing.
6.5.3.4.4 limer T4 (muximum delay between transmissions).
Timer T4 shall be set to the maximum delay
between transmissions (T4). Timer T4 shall be started or
restarted on en-queuing a frame for transmission. Timer T4
shall never be cancelled. If a DLE does not receive a frame
before Timer T4 expires, it shall send a command frame (P=l)
to ensure a response from the peer DLE. When in the ABM,
the DLE shall send an RR, when in the SRM, the DLE shall
send an SREJ; when in the F a , the DLE shall send a
W R . The value of Timer T4 shall be at least two minutes
longer for a ground DLE than for the peer aircraft DLE. The
command frame shall be transmitted using normal Timer T1
procedures up to N2 limes. If no response is received, the
DLE shall assume that the link is disconnected and that site
recovery procedures shall be invoked.
Note 1.- Timer T4 is used to verify the continued
existence of the link.
Note 2.- There is one fimer T4 per a DLE.
Note 1.- There is one Counter N2 per unacknowledged
fr ame.
Note 2.- The value of the ground N2 parameter may be
different from the value of the aircraft N2 parametel:
6.5.3.4.7 Parameter k (window size). Parameter k shall
be set to the maximum number of outstanding sequentially
numbered INFO frames that may be transmitted before an
acknowledgement is required.
Note.- The value of the ground k parameter may be
d.@erentfrom the value of the aircraft k parametel:
6.5.3.5 Description ojprocedures. Except as noted in
6.5.3.6 through 6.5.3.11.6, the standard procedures described
in IS0 4335 and IS0 7809 shall be followed.
6.5.3.6 Modes o f operation. The only modes of
operation that a DLE shall support are those detailed below.
6.5.3.6.1 Operational mode. The operalional mode shall
be asynchronous balanced mode (ABM).
6.5.3.6.2 Non-operational mode. The non-operational
mode shall be asynchronous disconnected mode (ADM).
Note.- Anzong the reasons a DLE or M E enters nonoperational
mode includes issul~g or receiving any of the
following frames: DISC, XID-CMD-LCR, DM or
XID-RSP-LCR (abbreviated frume names are de$ned in
Tables 6-11 and 6-17).
6.5.3.6.2.1 DISCframe. If a DLE is unable to continue
to receive, it shall transmit a DISC to terminate the current
Part I Annex 10 - Aeronautical Telecommunications
link. The P bit shall be set to 0 in DISC commands. A DLE expires. The only times that an INFO frame should be
shall treat all received DISCS (regardless of the P bit) as a transmitted with P= I is either when T4 expires or the transmit
DISC (P=O). window has closed.
Note.- The use of a DISC comrnan,d may result in the loss
of unacknowledged data.
6.5.3.6.2.2 DM ,frame. If a DLS receives any valid
unicasted frame, except for an XD or TEST frame, from a
DLS with which it does not have a link, it shall respond with
a DM frame. All DM frames shall be transmitted with the F
bit set to 0. An aircraft transmitting or receiving a DM frame
shall initiate link establishment on one LME if no links
remain. A DLE shall treat all received DMs (regardless of the
F bit) as a DM (F=O).
Note 1.- If an LME is in the process of executing a
hand08 it will retransmit the XIW-CMD-HO ( P = l ) and wait
for Emer T3 to expire.
Note 2.- A station receivittg an invalid frame may choose
to discard the frame instead of responding with a DM.
Note 3.-
unicasted XID
link are found
The procedures for an LME receiving a
from an M E with which it does not have a
in 6.5.4.4.
6.5.3.6.3 Frame reject mode, When in ABM or SRM,
and after transmitting a FRh4R command, the DLE shall enter
the frame reject mode (F'RM). The DLE shall re-enter the
ABM only after it receives a UA (F=l) frame.
6.5.3.6.4 Sent selective reject mode. When in ABM, and
after transmitting a SREJ, the DLE shall enter the sent
selective reject mode (SRM). The DLE shall re-enter the ABM
only after it receives the missing INFO frames.
6.5.3.7 USE OF THE P/F BIT
The use of the P/F bit shall follow the procedures detailed in
IS0 4335, except as modified by 6.5.3.7.1 through 6.5.3.7.4.
6.5.3.7.1 General. When a DLE receives a command
frame with the P bit set to 1, the F bit shall be set to 1 in the
corresponding response frame. The C/R bit in the address field
shall be referenced to resolve the ambiguity between command
and response frames.
6.5.3.7.2 INFO frames. After receiving an INFO frame,
a DLE shall generate an acknowledgement within T2 seconds
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