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distress), the GES management transmits a log-on confirm
LIDU followed by P/R channel control and T channel control
LIDUs to the AES, in spite of the following:
a) the AES is unauthorized to log-on; and
b) the GES has no resources to assign to the new request.
10.4.2.1.2 After the AES has logged on and is out of
distress (indicated by the receipt of lower precedence data by
Annex 10 - Aeronautical Telecommunications
the GES), the handling of non-distress communications by the
GES is at the discretion of the GES operator. A technique to
block non-distress communication at the GES is implementation
dependent.
10.4.2.2 GES hundover functions
10.4.2.2.1 A log-on GES, upon receipt of an AES logon
information from another GES in the satellite service area
served by the same satellite as the one serving the log-on
GES, suspends any data transaction in progress with the AES
10.4.2.4 Log-on prompt
The log-on prompt facility at a GES is used to prompt an AES
to log on when the GES link layer receives a signal unit (SU)
from an AES on an % channel and the AES is not in its AES
log-on status table. This situation can occur if the GES has not
updated its AES log-on status table after the initial log-on. The
GES transmits the log-on prompt LIDU to the AES on all P
channel frequencies.
10.4.2.5 Assignment of data channels
if this AES was previously logged on to it. The voice calls in
progress via the previous log-on GES does not have to be The GES management assign data channels (P, R, and T
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AES: however, it still retains the required information about which channels and with what ElRP to assign, can be made by
the AES. the GES management from the following information:
10.4.2.2.2 If the log-on information about an AES is a) the satellite in use (its return link sensitivity); and
received from a GES in a different satellite service area, then
the received GES susaends the data transaction and clears b) the level of AES.
voice calls in progre'ss with the AES if this AES was
previously logged-on to it and then deletes the AES from its The GES management can assign up to eight R channels and
AES log-on status table completely. The old log-on GES then up to four T channels at the time of log-on.
transmits log-off informati& to bther GESS ;n its satellite
service area.
10.4.3 GES CHANNEL MANAGEMENT
10.4.2.3 Log-on verification 10.4.3.1 C channel frequency management
10.4.2.3.1 The AMSS SARPs on GES management
specify two methods of verifying the operational status of an
AES. The direct verification method is utilized by the GES if
the log-on verification (LOV) bit in the log-on request LIDU
is set to zero by the AES; otherwise, indirect verification
method is used.
10.4.2.3.2 The purpose of log-on verification is to
optimize the use of resources among AESs. If an AES is not
active for a period of time specified in the AMSS SARPs (i.e.
it is not transmitting data or does not have a voice call set up
to the log-on GES or to any other GES in the same satellite
service area), the log-on GES logs-off the AES if the AES
does not respond to log-on interrogation (for direct log-on
verification) or remains inactive for 12 hours (for indirect
verification). The resources released can thus be made available
to other AESs that are trying to log on but cannot
succeed due to insufficient resources at the GES.
10.4.2.3.3 The reason for an AES logged on to a GES
to be inactive is that the AES has either landed without
logging off or has switched satellites. Under such conditions.
it is appropriate for the log-on GES to log off the AES.
On the basis of known/planned/predicted traffic capacity
requirements, the GES can be pre-assigned a number of SCPC
frequencies for use as a forward and return C channels. The
total number of frequencies assigned to GESs within the same
satellite service area is normally less than the total capacity
available for the satellite in operation. On demand, each GES
assigns the frequencies for a circuit-mode call from its own
pool. However, lack of channel frequency for a call at the
GES results in the initiation of a channel frequency
reassignment request to a central authority which initially
made the pre-assignment. The central authority can then make
an assignment of frequency to the GES utilizing the
frequencies held in a common pool.
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