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identifier shall be encoded as four 8-bit IS0 IA5
characters as per Table 6-43.
6.5.4.2.7.3 Nearest airport parametet: This parameter
defines the four-character airport IQ of the airport nearest the
ground station. It shall bc encoded as four 8-bit IS0 IA5
characters as per Table 6-44. The nearest airport parameter
shall not be incIilded in an XID if the Airpoa Coverage
Indication is included.
6.5.4.2.7.4 ATN muter NETs parameter: Tl~is parameter
defines a list of ATN air-ground routers identified by the
"administration identifier" (ADM) and "administration region
selector" (ARS) subfields of their network entity titles (NETs).
It shall be encoded as per Table 6-45.
6.5.4.2.7.5 Ground-based svstem mask parameter: This
parameter defines the ground-based system mask. It shall be
encoded as a 27-bit mask in a 32-bit field as per Table 6-46.
6.5.4.2.7.6 Timer TE3 parafireter This parameter defines
the value of amcr TG3 (in half-seconds) that the ground LME
is using. It shall be encoded as a pair of unsigned 16-bit
integers as per Table 6-47.
6.5.4.2.7.7 Rmer TG4 parameter: This parameter defines
the value of Timer TG4 (in seconds) that the ground LME is
using. It shall be encoded as an unsigned 16-bit integer as per
Table 4-48. A value of 0 shall mean that the ground LME is
not using this timer.
6.5.4.2.7.8 Ground station location parameter This
parameter defines the position of the ground station. It shall be
encoded as shown in Tables 6-30 and 6-49.
6.5.4.3 VME SERVICE SYSTEM
PARAMETERS
The VME service shall implement the system parameters
defined in Table 6-50 and detailed in 6.5.4.3.1 through
6.5.4.3.5.
6.5.4.3.1 Timer TGI (minimum frequency dwell time).
Timer TGl shall be set to the minimum time (TG1) an aircraft
LME dwells on a frequency while attempting to establish a
link (in order to receive a valid uplink from at least one ground
station). This timer shall be set by an aircraft LME (if it is not
already running) when an aircraft tunes to a new frequency
during a frequency search. It shall be cancelled when a valid
uplink is received. On expiry of the timer the aircraft station
shall:
a) establish a link with one of the ground-based systems
from which it has received a valid uplink;
b) continue searching; or
c) if an aircraft does not detect any uplink traffic within
TGl seconds, it shall tune to the next frequency in the
search table.
Note I.- The duratior~o f TG1 should be chosen to ensure
a valid uplink is received from nt least one ground-based
system before the timer expires.
Note 2.- There is one Tirner TGI per LME-
6.5.4.3.1.1 Recommendation.- In order to allow an
airera$ station an opportunity to link to its most prefered
ground-based system, Emer TGl should not be cancelled
unless a vulid uplink is received fmnz its most prefered
ground-bused system.
6.5.4.3.2 Emer TG2 (maximum idle activity rime). Timer
TG2 shall be set to the maximum time (TG2) that an LIVE
shall retain information on another station without receiving a
lransmission from it. The tiiner shall be started when a valid
transmission is iirst received from a station and shall be
restarted an each subsequent receipt of a valid transmission
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No. 75
Part I Annex 10 - Aeronautical Telecommunicalions
from that station. It shall never be cancelled. If Timer TG2
expires, an LME shall assume that the station is no longer
reachable; if a link existed with that station, then silt recoven
shall be invoked.
Note.- There is one Emer TG2 for each station being
monitored.
6.5.4.3.3 Timer TG3 (muximum time between
tmnsmissions). Timer TG3 shall be used at the ground station
only. The timer shall be set to the maximum time (TG3)
between transmissions on any frequency. Timer TG3 shall be
started when the station becomes operational and restarted on
the transmission of any frame. This timer shall never be
cancelled. On expiration, if the ground station is operational,
then it shall transmit a GSIF; the timer shall be restarted. The
value to set the TG3 timer to shall consist of a fixed value
equal to the minimum value plus a random value uniformly
chosen between 0 and 20 seconds.
Note.- There is one Timer TG3 per ground station.
6.5.4.3.4 limer TG4 (minium time between GSIFs).
Timer TG4 shall be used at the ground station only. The timer
shall be set to the maximum time (TG4) between
transmissions of a GSF on any frequency. Timer TG4 shall be
started when the station becomes operational and restarted on
the' transmission of a GSIF. This timer shall never be
　
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