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with a GES, the SSNL clears all connections and SVCs
associated with that GES. 'Phis may be done by sending
CLEAR INDICATION packets to each IS0 8208 WE logical
channel associated with these connections and releasing the
resources for the logical channels in the associated SSNDPA
entity.
7.5.1.1 (Reserved)
7,5.2 GES MANAGEMENT INTERFACE
When an f f i S logs-off from a GES, the SSNL should clear the
connections between the SNS user(s) and the logged-off AES.
This may be done by sending CLEAR MDICATION packets
to each IS0 8208 DCE logical channel associated with these
connections and releasing resources for the logical channels in
the associated SSNDPG entity.
8. CIRCUIT-MODE SERVICES
8.1 Circuit-mode voice
signalling protocols
8.1.1 General. The circuit-mode logic processes defined
in Annex ZC1, Volume IU, Part I. Chapter 4, 4.8 represent the
minimum set, of protocol interactions necessary to ensure
intemperability of aircraft earthtations (AESs) and ground
8.1.4.1 Airrrafr earth station (AES) pmeduw
8.1.4.1.1 Call origination
8.1.4.1.1.1 &mmI call establishment. The AES
commences an air-origination by transmitting to the GES an
''access request" CM-UDU. The AES then awaits receipt from
the GBS of a C channel assignment CM-W Ufo r a period of
tA50 seconds. This sequence is repeated four times before
abating the call attempt. Calls aborted by the AES in this
manner must be re-attempted by the user.
8.1.4.1.1.2 Abbreviated call establishment. The AES
commences an air-origination by transmitting to the GES a
series of four, three, or two contiguous "access questi* CMLIDUs.
The series length is determined by whether the call
priority is distresslurgency. flight safety or regularity/
meteorological, respectively. The purpose of the multiple
transmissions is to mitigate the effects of an SU lost due to R
channel collisions. The AES then awaits receipt from the GES
of a C channel assignment CM-LIDU for a period of tASO
seconds. 'Ihis sequence will be repeated four times before
aborting the call attempt. Calls abofied by the AES in this
manner must be re-attempted by the user.
8.1.4.1.2 At the instant at which the call origination
begins, if sufficient AES resources for the call are not available
due to blockage attributable to a lower priority call at the AES,
the AES will defer pre-emption of these resources and proceed
as per 8.1.4.1.1 until a C channel assignment is received
from the GES. This will allow the AES to make a proper
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No. 75
Attachment A to Part I Annex 10 - Aeronautical Telecommunic~tions
pre-emption decision based on the exact EIRP assignment
from the GES. Upon receipt of the C channel assignment, all
required AES C channel resources (i.e. channel unit and AES
W) are pre-empted from a lower priority call (if necessary)
and allocakd to the call. This is followed immediately by
further signalling and continuity checks on the C channel subband
while the GES is engaged in completing the call to the
ground destination.
Note.- As a secondary ben@fitb, y byquiring that the AES
defer pre-emption until a C c b las signment is received, the
fumm &velopmnt of on altemative procedure incorpomting
muse of an existing C cham1 is facilitated.
8.1.4.1.3 Addrew digits
8.1.4.1.3.1 Genernl call establishment. The "access
request" CM-LIDU contains the first two digits of the
AMS(R)S ground address. The remaining digits are provided
on the C channel sub-band as "call information - service
address" CM-IlDUs.which serve as a basis for the C channel
continuity check ppcedure.
3
8.1.4.1.3.2 Abbreviated call establishment. The "access
request" CM-IJDU contains all digits of the fixed-length
10-digit AMS(R)S ground address. Providing this information
concurrent with the access request allows the GES to begin
forward completion of the call across the ground network
while it proceeds simultaneously with C channel establishment.
These address digits are repeated on the C channel subband
as "call infonnation - service address" CM-LIDUs
which serve as a basis for the C channel continuity check
procedure. However, their presence in these CM-LIDUs serves
no purpose for the AMS(R)S air-origination procedure other
than to allow the AES to interwork with a GES which supports
prevalent non-safety AMSS circuit-mode procedures rather
than the SARPs-specific air-origination procedure.
8.1.4.2 Ground earth station (GES) procedutv
8.1 .4.2.1 Pmessing of call initiation
8.1.4.2.1.1 Geneml call establishment. Upon receipt of an
　
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