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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. The SSNL in the
AES shall provide the additional connectivity notification
service by sending connectivity notification event messages to
Part I Annex 10 - Aeronautical Telecommunuah'ons
the attached aeronautical telecommunication network (ATN)
router. Both of the SSNL in the AES and GES shall contain
the following three functions:
a) satellite subnetwork dependent (SSND) function;
b) subnetwork access (SNAcj function; and
c) interworking (IW) function.
The AES shall contain the additional connectivity notification
(CN) function. The SSND function shall perform the SSND
protocol (SSNDP) between each pair of AES and GES by
exchanging subnetwork protocol data units (SNPDUs). It shall
perform the SSNDP aircraft (SSNDPA) function in the AES
and the SSNDP ground (SSNDPG) function'in the GES. 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 CN function shall send connectivity
notification event messages to the attached ATN router
through the SNAc function. The IW function (IWF) shall provide
the necessary harmonization functions between the SSND,
the SNAc and the CN functions. Figure 4-1 1 shows the SSND.
IW and SNAc functions and the ATN satellite subnetwork
protocol architecture.
4.7.1.1.2 The term DCE when used shall mean IS0
8208 X E .
4.7.1.1.3 The SSNL shall interface with the link layer
and the AESIGES management.
The SSKL shall provide the following services:
a) transparency of transferred information - provide for
the transparent transfer of octet aligned SSNL user
data and/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 [he 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 percentiIe). The 95th
percentile of the statistical distribution of delays for which
transit delay is the average.
4.7.2.1.3 Subnetwork service data unit (SNSDU). An
amount of subnetwork user data, the identity of which is preserved
from one end of a subnetwork connection to the other.
Note.- Subnetwork perj%rtnance depends on a number of
factors, including the level of communication franc. The
performance vulues given here apply during peak busy hours.
4.7.2.2.1 CONNECTION ESTABLISHME?fT DELAY
Note.- Connection establishment delay, as defined in. lSO
8348, includes a component, attributable to the called
subnetwork service user; which is the time benveen the
SN-CONNECT indication and the SN-CONNECT response.
This user component is due to actions outside the boundaries
of the satellire subnetwork and is thewfore excluded from rhe
AMSS specifications.
4.7.2.2.1.1 Connection establishment delay shall not
exceed the following maximum values:
Maximum connection
Minimum channel established delay
rate in use by AES (95 percentile)
(bitds) (seconds)
4.7.2.2.2 Transit delay
Note. -In accordance wirh IS0 8348, transit delay values
are based on a jxed SNSDU length of 128 octets. Transit
delays are dejined as averuge values.
4.7.2.2.2.1 Transit delay shall not exceed the following
maximum values:
Annex 10 - Aerortartical Telecommunicntions Volume I11
Maximum transit delay (seconds)
To-aircraft aircraft
Minimum
service service
4.7.2.3 RELIABILITY OF SERVICE
The residual error rate in the from-aircraft direction shall not
exceed la4 per SNSDU. The residual error rate in the toaircraft
direction shall not exceed 10.' per SNSDU.
600 12 40 40 Note.- Residual error rate includes the probabiliiy of
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