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which is the probability hat an attempt to transfer a
single DATA packet is not entirely successful. It is based on
a standard reference DATA packet containing 128 octets of
subnetwork user data. The undetected error probability for
AMSS packet data service is expected to be less than 3 x 10"
for standard reference DATA packets containing 128 octets of
subnetwork user data. The undetected error probability for
shorter packets is reduced approximately in proportion to the
packet length.
7.2.3.3 Other reliability of service parameters are
resilience of the virtual circuit or logical channel with respect
to reset and release, i.e. the probability that the subnetwork
service provider invokes a reset or release over some period of
time. Reset and release operations may result in the loss of
user data, whether invoked by the subnetwork user or by the
subnetwork service provider.
73 Satellite subnetwork dependent
protocol s e w and 0 ~ t i 0 n s
7.3.1 LOGICAL CHANNELS
The requirements for selecting logical channel numbers are
intended to prevent call collisions.
7.3.2 CONNECT~OENS TABLISHMENT
7.3.2.1 The following describes a normal connetlion
establishment between two SNS users.
7.3.2.2 When a subnetwork connection is initiated by
one of the SNS users, an IS0 8208 DCE entity in the satellite
subnetwork receives an IS0 8208 CALL REQUEST packet
from the IS0 8208 DTE. This packet is forwarded to the IWE
The SWF forwards this packet to the appropriate SSNDPX
entity. This SSNDPX entity forwards this packet as a
CONN-ON REQUEST SNPDU to the remote SSNDPX.
When the remote SSNDPX receives this SNPDU, it forwards
this to the IWF as an IS0 8208 INCOMING CALL packet.
The IWF forwards h s packet to the appropriate IS0 8208
DCE entity. The IS0 8208 JXE entity forwards this packet to
the peer IS0 8208 DTE entity. The IS0 8208 DTE forwxds
this connection request to the receiving SNS user. After the
receiving SNS user has accepted tiis connection request, the
IS0 8208 DTE entity forwards an IS0 8208 CALL
ACCWTELI packet to the peer IS0 8208 DCE entity. The
IS0 8208 ICE entity forwards this packet to the IWF. The
MrF forwards this packet to the a p p m a t e SSNDPX entity.
This SSNDPX entity forwards this packet as a CONNECTION
CONFIRM SNPDU to the peer SSNDPX entity. When the
remote SSNDPX entity receives this SNPDU; it forwards this
as an IS0 8208 CALL CONNECTED packet tn the IWF. The
XWF forwards this packet to the appmpriate 1SO 8208 DCE
entity, This IS0 8208 W E entity forwards this packet to the
peer IS0 8208 DTE entity. When the IS0 8208 DTE entity
receives this packet, it informs the originating SNS user about
the establishment of a connection to the remote SNS user.
7.3.2.3 A connection between two SNS users consists of
a series of logical channels. Each logical channel is selected
based on the established rule by the receiving- entity. Therefore,
these logical channels may not have the saqe number.
Figure A-17 of this guidance material shows an example of
connection establishment between three pairs of SNS users.
7.3.2.4 Throughput negotiation
Since the GES has the knowledge of available throughput
based on the throughputs that have been assigned to the
existing subnetwork connections (SNCs), it should assign the
throughput classes for each direction of data msrnission. The
recornmendd actions by the GES are given in 7.3.6.1 and
7.3.7.1 of this guidance material.
To avoid unnecessary releases at the SSNDPG caused by
residual DATAAHTEIWUPT SNPDUs from the SSNDPA, the
SSNDPA waits until all DATAflMERRUPT SNPDUs in
transmission and pertaining to that connection have been
transmitted befm forwarding a CONNECTION RELEASED
or a CONNECTION RELEASE COMPLEIE SNPDU to the
SSNDPG. The SSNDPA need not correlate the transmission
status of each DATMNTFRRUPT SNPDU with transmission
status indications from the data link layer, However, the
SSNDPA waits until all outstanding DATALNERRUPT
SNPDUs have been acknowledged by the link layer
(success/fail LIDU) before sending a CONMCTION
RELEASED or CONNECTION RELEASE COMPLETE
Adfachmmt A to Part I Annex 10 - AmonaUauacuTl ehcommunications
SNPDU. Since to-aircraft SNPDUs are always delivered in
proper sequence by the link layer, the SSNDPG may send a
CONNECTION RELEASED or CONNECTION RELEASE
COMPLETE SNPDU without waiting for acknowledgement
of previously sent DATAmVTERRUPT SNFDUs.
7.3.4 DATA TRANSFER
The IWF should forward the DATA packets between the
appropriate SSNDPX and IS0 8208 DCE entities and supply
these entities with sufficient information to identify the
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