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Annex 10 - Aeronautical Telecommunications Vo Zum e 111
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 Timer 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 parametel: This
parameter defines the position of the ground station. It shall be
cncodcd as shown in Tables 6-30 and 6-49.
6.5.4.3 VME SERVICE SYSTEM
PARAMETERS
The VME servicc 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 Emer TGI (mi~zimumfr equency dwell time).
Timer TGI shall be set to the minimum time (TGI) an aircraft
LME dwells on a frequency while attempting to establish a
link (in ordcr to rcceive 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
TGI seconds, it shall tune to the next frequency in the
search table.
Note I.- The duration of TGI should be chosen to ensure
a valid uplink is received from at least one ground-based
system before the timer expires.
Note 2.- There is one Timer TGI per LME.
6.5.4.3.1.1. Recumrnendatiun.- In order to allow an
aircraft station an opportunity to link to its most prefered
ground-based system, Timer TGl should not be cancelled
unless a valid uplink is received from its most prefered
ground-based system.
expires, an LME shall assume that the station is no longer
reachable; if a link existed with that station, then site recovery
shall be invoked.
Note.- There is one Timer TG2 for each station being
monitored.
6.5.4.3.3 Timer TG3 (maximum time between transmissions).
Timer TG3 shall be used at the ground station only.
The timer shall be set to the maximum time uG3) 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 Emer TG3 per ground station.
6.5.4.3.4 Timer TG4 (maximum 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 GSIF on any frequency. Timer TG4 shall be started when
the station becomes operational and rcstartcd on the
transmission of a GSE This timer shall never be cancelled.
On expiration, if thc ground station is operational, then it shall
transmit a GSIF; the timer shall be restarted. The value to set
the TG4 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 Emer TG4 per ground station.
6.5.4.3.5 Timer TG5 (maximum link overlap time).
Timer TG5 shall be set to the maximum time that initiating
and responding LMEs shall maintain the old link during
handoffs. The LME initiating the handoff shall start its Timer
TGS when it receives an XID-RSP-HO. The LME responding
to the handoff shall start its Timer TG5 when it transmits .its
XU>-KSP-HO. The initiating LME shall never restart its
Timer TG5; the responding Lh4E shall restart its Timer TG5
if it retransmits an XID-RSP-HO. Timer TG5 shall be
cancelled if either the old or new link is prematurely
disconnected. After TG5 expires, each LME shall silcntly
disconnect its half of the old link.
Note.- There is one Emer TG5 per LME-
6.5.4.3.2 Emer TG2 (maximum idle activity time). Timer 6.5.4.4 DESCRIPTOIFO LNM E
TG2 shall be set to thc maximum time (TG2) that an LME PROCEDURES
shall retain information on another station without recciving a
transmission from it. The timcr shall be started when a valid The aircraft and ground LMEs shall usc the XID frame types
transmission is first received from a station and shall bc listed in Table 6-51 and the procedures described in the text
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