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or if the channel is released.
If an ISU or an LSU with a Q number equal to the Q number
of the SU set awaiting completion is received, the GES shall
discard the incomplete SU set awaiting completion.
4.6.7.3.2.1 If no more SUs corresponding to a
transmission of an SU set are expected, the GES shall
determine whether or not there are any missing SUs. The GES
shall then do the following:
a) if there ire no missing SUs, the GES shall reassemble the
SUs into an LIDU according to 4.6.3.4.3 and pass the
LIDU to the appropriate hk service user in the GES;
b) if there are any missing SUs, the GES shall not generate
an LIDU from the received incomplete su set; instead,
the GES shall store the received SUs until the other
missing SUs are received in a retransmission of the SU
set, or until the channel is released.
4.7 SATELLITE SUBNETWORK
LAYER
4.7.1 General provisions
4.7.1.1.1 The satellite subnetwork layer (SSNL) in the
AES and GES shall provide connection-oriented packet data
service -by establishing subnetwork connections (SNCs)
between subnetwork service (SNS) users. Both of the SSNL in
the AES and GES shall contain the following three functions:
a) satellite subnetwork dependent (SSND) function;
b) subnetwork access (SNAc) function; and
C) interworking (IW) function.
Y11/00
No. 75
Annex 20 - Aeronautical Telecommunications Volume 111
The SSh'D function shall, perform the SSND protocol
(SSNDP) between each pair of AES and GES by exchanging
subnetwork protocol data wits (SNPDUs). It shall perform the
SSNDP aircraft (SSNDPA) function in the AES and the
SSXDP ground (SSNDPG) function in the GES. At a
minimum, the SNAc function shall perform the IS0 8208
protocol between the AES or GES and the attached routers by
exchanging IS0 8208 packets. It shall perform the 'IS0 8208
DCE function in the AES and the GES. The IW function
(WF) shall provide the necessary harmonization functions
between the SSND and the SNAc functions. Figure 4-11
shows the SSKD, IW and SNAc functions and the ATX
satellite subnetwork protocol architecture.
4.7.1.1.2 The term DCE when used shall mean 'IS0 8208
DCE.
4.7.1.1.3 The SSNL shall interface with the link layer and
the AES/GES management.
Note.- Subnetwork performance depends on a number of
factors, including the level of cammunication trafic. The
performance values given here apply during peak busy hours.
4.7.2.2.1 CONNECTIOENS TABLISHMENT DEIAY
Note.- Connection estublishment delay, as defied in IS0
5348, incltades a component, a~ribrrtuble to the called
subnetwork servic~ use< wliicll is the time between the
SN-CONNECT indication and the SN-CONNECT response.
This user component is due to actions outside rhe boundaries
of the satellite subnehvork and is therefore excluded from the
AMSS specifications.
4.7.2.2.1.1 Connection establishment delay shall not exceed
the following maximum values:
4.7.1 ,?1 SERVICES
The SSNL shall provide the following services:
- - -
Maximum connection
Minimum channel established delay
ratc in use by AES (95 percenttle)
(hits/s) (seconds)
a) transparency of transferred information - provide for
the transparent transfer of octet aligned SSNL user data
an& or control information; and
b) quality of service selection - make available to SNS
users a means to request and to agree to the quality of
service for the transfer of SSNL user data.
4.7.2 Packet data performance
4.7.2.1.1 The terms used with respect to packet data
performance are based on the definitions in IS0 8348 (first
edition). In applying these definitions to the AMSS
subnetwork layer, the word "network" and its abbreviation "N"
in IS0 8348 are replaced by the word "subnetwork" and its
abbreviation "SN", respectively. wherever they appear.
Additional definitions are provided as follows.
4.7.2.1.2 Data transfer delay (95 percentile). The 95th
percentile of the statistical distribution of delays for which
transit delay is the average.
4.7.2.1.2 bis Data transit delay. In accordance with
IS0 8348, the average value of the statistical distribution of
data delays.
4.7.2.2.2 DATA TRANSllf DELAY
Note.- In accordance with ISO 8348, darn transit delay
values are bused on a.fied SNSDU length of 128 octers. Data
transit delays ure defined as average values. (4.7.2.1.2 a d
4.7,2.1.2 bis refer)
4.7.2.2.2.1 Data transit delay shall not exceed the
following maximum values:
4.7.2.1.3 Subnetwork service data unit (SNSDU). An
amount of subnetwork user data, the identity of which is Note.-- In any particular AES, lower priority ftom-aircraflm-airrofl
　
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