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two bursts and the burst length of each burst corresponding to
the same LSDU are made such that the transfer delay for the
entire LSDU meets the performance requirements specified in
Annex 10, blume Dl, Part I, Chapter 4, 4.7. Since the
transmitter in the AES cwld be shared between the R and T
channels and the T channel mode of the transmitter has higher
priority than its R channel mode, the assignment of
reservations on the T channel will affect the R channel
transmissions. The resewations are assigned on the T channel
in such a way that most of the time there is at least one R
channel burst every eight seconds from each AES logged on to
the GES assigning reservations. The burst length and burst
interval are not specified in the AMSS SARPs; they are
implementation dependent
6.4.3.7 mpical values for the length of an individual burst
are as follows:
a) 18 SUs for a T channel operating at 600 bitds;
b) 17 SUs for a T channel operating at 1 200 bitds;
c) 31 SUs for a T channel operating at 2 400 bitsis; and
d) 31 SUs for a T channel operating at 10 500 bits/s.
vpical values for the burst interval are as follows:
a) 16 frames for a T channel operating at 600 bitds;
b) 8 frames for a T channel operating at 1 200 bits/s;
c) 4 frames for a T channel operating at 2 400 bitds; and
d) 1 frame for a T channel operating at 10 500 bitds.
6.4.3.8 The earliest starting time that a reservation can be
made by the GES must be such that the AES can receive the
reservation in time to transmit at the star& of the assigned
reservation. This time takes into account tbe processing time at
both the GES and the AES as well as coding and decoding
Annex 10 - Aeronautical Telecommunications Volume IIZ
delays. The value for the earliest starting time is 7.1.1.2 SNAc function
implementation dependent and is computed according to the
formula given below: Each SNAc function contains one or mote IS0 8208 DCE
entities. Each IS0 8208 DCE entity communicates with the
Minimum delay to start of reservation = P channel unit peer IS0 8208 data terminal equipment (DTE) entity in the
delay + GES processing delay 4 P channel queuing attached aeronautical te1ecommunication network (ATN)
delay 4 R-slot duration + 0.2 see(*) + propagation delay router using the IS0 8208 protacol. + AES processing delay.
* 0.2 seconds is the R/T channel switching time. 7.1.1.3 (Reserved)
A system implementor has obtained the typical values shown
in nble A-10 for some of the components. A typical value for
GES processing delay is in the order of 200 msec; 7.1.1.4 IWfunction
6.4.3.9 The GES, upon receipt of either a log-on to
another GES or log-off information about an AES which was
logged on to it, may discard'the reservations &signed to the
AES, making the slots available for assignment to its other
logged on AESs.
65 Sub-band C channel
to-aircraft and
from-aircraft protDco1
The sub-band C channel promo1 defined in AMSS SAWS
contained in Annex 10, Volume III, Part I, Chapter 4. 4.6
specifies direct link service (DLS) for signalling SUs. The'subband
C channel carries signalling .for circuit-mode services to
set-up, maintain or release the C channel.
7. SATELLITE SUBNETWORK
LAYER
7.1 General proviiioas
7.1.1 ARCHITE~RE
To facilitate the development of interoperability specifications,
the subnetwork layer has been divided into functional areas.
This functional division is not intended to preclude
implementations that aggregate functions in other ways, so
long as the airborne and ground implementations of the
subnetwork layer each behaves (to an external observer) as if
it conformed with the provisions of this section.
Each SSNDPX function contains one or more SSNDPX
entities. Each entity communicates with the peer SSNDPX
entity using the SSNDP.
Each IW function contains one IW entity. The IW function
perfonns the necessary harmonization between the SSND and
the SNAc functions. It forwards IS0 8208 packets between the
IS0 8208 DCE and SSNDPX entities.
7.1.2 BACKGROUNFDOR THE USE OF
IS0 8208 AND THE ASSOCIATED
SUBNETWORK DEPWDENT PROTOCOL
In the ~ateltite subnetwork, data may be received out-ofsequence
or duplicated. The subnetwork dependent
convergence function (SNDCF) in the ATN router which uses
the services provided by the satellite subnetwork assumes an
underlying connection-mode service which provides
sequenced delivery of data. The SNDCF does not perform any
error recovery function to handle data duplication and data
received out-of-sequence. Therefore, it requires a reliable
connection-mode service which is provided by the IS0 8208
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