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address shall be 27 bits, divided into a 3-bit type field and a and x;
24-bit specific address field.
x = Tlmult* TD * T l e ~ p ' ~ ~ " " ~
6.5.3.3.3.4 Address type. The address type field is
described in Table 6-7. TDP9 = (TMl*Ml)/(l-uj and is the running estimate for
the 99th percentile transmission delay (between the time at
653.335 Aircraft specfzc addresses. The aircraft which the frame is sent to the MAC sub-layer and the time
specific address field shall be the 24-bit ICAO aircraft address. at which its transmission is completed);
6.5.3.3.3.6 1CAO-administered ground starion specific u is a measurement of channel utilization with a range of
addresses. The ICAO-administered ground station specific value from 0 to 1, with 1 co~respondingt o a channel that
address shall consist of a variable-length country code prefix is 100 per cent occupied;
(using the same country code assignment defined in Annex 10,
Volume In, Chapter 9, Appendix 1, Table 1) and a suffix. The retrans is the largest retransmission count of all the
appropriate authority shall assign the bits in the suffix. outstanding frames.
6.5.3.3.3.7 ICA 0-delegated ground station speciJc
addresses. The ICAO-delegated ground station specific address
shall be determined by the organization to which the address
space is delegated.
6.5.3.3.4 Broadcast address. The broadcast address shall
be used only as a destination address for unnumbered
information (UI) frames or for XID frames broadcasting
ground station information.
Timer T1 shall be started after any INFO, RR (P=l), SREJ
(P=l) or FRMR frame is queued for transmission unless it is
already running. If the timer expires, all outstanding INFO, KR
(P=l), SREJ (P=l) or FlWR frames that have been queued
for at least Tlmin + 2TD shall be retransmitted. The timer
shall be cancelled upon receipt of an acknowledgement.
After processing an acknowledgement or Timer TI
expires, Timer T1 shall be restarted if therc are still frames
-6111WI
No. 72
Annex 10 - Aeronautical Telecommunications Volume 111
outstanding. Whenever Timcr T1 is restarted, the timer shall 6.5.3.4.4.1 Recornmendation.- A DLE in the ABM or
be set as if it had been started when the oldest outstanding SRM should send any outstandingframes with the P bit of the
frame was queued. last INFO frame set to I.
Note.- There is one Timer TI per DLE.
6.5.3.4.2 Parameter 72 (delay before acknowledgement).
Parameter T2 defines the maximum time allowcd for the DLE
to respond to any received frame (other than an XID) in order
to ensure the response is received before the peer DLE's
Timer TI expires.
A station shall respond to any received frame (other than
an XID) within parameter T2 time in order to ensure the
response is received before the peer DLE's Timer T1 expires.
6.5.3.4.5 Parameter N1 (maximum number of bits of any
frame). The parameter N1 defines the maximum number of
bits in any frame (excluding flags and zero bits inserted for
transparency) that a DLS shall accept.
6.5.3.4.6 Counter N2 (maximum number of transmissions).
Countcr N2 defines the maximum number of transmissions
that the DLS shall attempt to transmit any outstanding
XD-CMD frame. A Counter N2 shall be set to zero when
a new frame is ready for transmission. Counter N2 shall be
incremented after each transmission of the frame. The counter
Note.- The period T2 should be a delay (shorter than the
shall be cleared after its associated frame is acknowledged.
Xlmin value of the peer DLE) to permit the acknowledging
When Timer T1 expires, a DLE shall invoke the retransmission
procedures of 6.5.3.4.1 up to N2 - 1 times. When
DLE to schedule the response as an event in normal data Timer T3 expires, a DLE shall invoke the retransmission
processing and to allow sufficie~zt time for an acknowledgement
while maximizing the likelihood that an INFO frame will
procedures of 6.5.3.4.3 up to N2 - 1 times. When Counter N2
reaches the maximum number of attempts (value of parameter
be transmitted and eliminate the need for an explicit
acknowledgement. N2) the LME shall be informed and the frame shall not be
transmitted.
6.5.3.4.3 Timer T3 (link initialization time). Timer T3
shall be set to the time that a DLE waits for an XID response
before retransmitting an exchange identification command
(XID-CMD). The period of Timer T3 shall be computed by
using the same algorithm and parameters of Timer T1, except
that T3min shall be separately negotiated. XID-CMDs (except
for ground station information frames) shall be retransmitted
using thc procedures defined in 6.5.3.4.1.
Note 1.- There is one Timer T3 per a DLE.
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