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to any GES within the same satellite service area. This
information can be used by a GES for call routing purposes
such as to reject a ground-jnjxiated call request destined fcrr an
AES not logged-on to any GES in the satellite service area or
to forward the call request to the GES to which the destined
AES is logged-on.
10.4.1.4 Each GES also maintains an authorization table.
This table contains the fist of all aircraft addresses for those
AESs whose operators have successfully completed the
administrative reguimments necessary to enable the AES to
operate within an AMS(R)S system. These administrative
steps include, but are not limited to: confirmation that the
aircdt adQess is ccmct and issued by an appropriate body;
AES equipment has succe,ssfully passed unit testing; and
wmwi and billing &tails for the M.3 operator ate m ~ t .
10.4.2 GES LOO-ON STATUS MANAGEMENT
10.4.2.1.1 A log-on GES, upon receipt of an AES log-on
information from another GES in the satellite service area
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A#rrchent A to Ptui I Anne* 10 - Aemluultical Telecommunlc&n~
served by the same satellire as the one serving the log-on GES,
suspends any data transaction in progress with the AES if this
AES was previously logged on to it. The voice calls in
progress via the previous log-on GI3 does not have to be
cleared since the AES can establish calls via a GES other than
its log-on GES. The previous log-on GES does not indicate the
AES in its AES log- status table as being its logged on AES;
however, it still retains the required information about the
AES.
10.4.2.1.2 If the log-on information about an AES is
received from a GI3 in a different satellite service area, then
the d v e d GES suspends the data transaction and clears
voice calls in progress with the AES if this AES was
previously logged-on to it and then deletes the AES from its
AES log-on status table completely, The old log-on GES then
transmits logoff information to other GESs in its satellite
service area.
10.4.2.2.1 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-w verification (LOV) bit in the log-w request LIDU
is set to zero by the AES; otherwise, indirect verification
method is used.
10.4.2.2.2 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 intermgation (for direct log-on
verification) or remains inactive for 12 hours (for indirect
verification). Ttte 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.
10.4.2.2.3 The r e m 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
appmpiate for the log-on GES to log off the Am.
10.4.2,3 Lug-on prompt
The log-on pmmpt 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 scams table after the initial log-on. The
GES transmits the log-on prompt LIDU to the AES on all P
channel frequencies.
10.4.2.4 Assignment of data channels
The GES management assign data channels (P, R, and T
channels) at the highest bit rate, which is provided at both the
GES and the AES and is supported by the combination of a
satellite in use and the level of the AES. The decision as to
which channels and with what EIRP to assign, can be made by
the GES management from the following information: .
a) the satellite in use (its return link sensitivity); and
b) the level of AES.
The GES management can assign up to eight R channels and
up to four T channels at the time of log-on.
10.4.3 GES CHANNEL MANAGWENT
10.4.3.1. C channel frequency management
On the basis of knownlplannedpredicted traffic capacity
requirements, the GES can be preassigned 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
　
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