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1.200 8 25 30 undetected error; the probability of losing an SNSDU, and the
2 400 5 12 15
probability of duplicating an SNSDU.
Note. - In any particular AES, lower priority fromaircraft
tra.c may be subject to additional delay, depending
on the amount and rate of from-aircraft traffic loading.
4.7.2.2.3 DATA TRANSFER DELAY (95 PERCENTILE)
Data transfer delay (95 percentile) shall not exceed the
following maximum values:
Maximum data transfer delay
(95 percentile)
(seconds)
4.7.2.3.2.1 The probability of an SNC provider-invoked
SNC release shall not exceed I o4 over any one-hour interval.
Note.- Connection release resulting from either GES-to-
C;ES handover or AES log-off or VC pre-emption are excluded
from this specification..
4.7.2.3.2.2 The probability of an SNC provider-invoked
reset shall not exceed 10" over any one-hour interval.
4.7.3 Satellite subnetwork-dependent
protocol services and operations
From-
To-aircraft aircraft 4.7.3.1 GENERAPLR OVISJONS
Minimum
Since the functional differences between the SSNDPA and
(bitsls) service service service SSNDPG are minimal, their operations shall be described in
terms of SSNDPX where X shall stand for either A or G.
600 15 110 80 Where differences do occur, the SSNDPA and SSNDPG
functions shall be described individually.
1 200 9 60 65
4.7.3.2 SATELL~STUEB NETWORK-DEPENDENT
PROTOCOL ENTITIES
- 10500 4 10 30
Note.- At least one pair of SSNDPA and SSNDPG entities
exists between each pair of AES and GES. Figure 4-12 shows
two pairs of SSNDPA and SSNDPG entities between two AESs
Note.- In any particular AES, lower priority from-ai fcraft and a GES.
traffic muy be subject to additional delay, depending on the
amount and rate of from-aitrrafr traffic loading. 4.7.3.2.1 The SSNDPX defined in this section shall
pertain to each SSNDPX entity.
4.7.2.2.4 CONNECTIORENL EASE DELAY 4.7.3.3 LOGICACLH ANNELS
The connection release delay (95 percentile) shall not exceed Note.- The connections between SSNDPAs and SSNDPGs
30 seconds. are established through logical channels. Up to 255 logical
p@ I Annex 10 - AeronauticaZ Telecommunications
channels m y be established between each pair of SSNDPX
entities. Each logicirl channel is identijed by its own logical
channel number (LCN) ranging from I through 255. LCN 0 is
reserved.
4.7.3.3.1 For a new ground-to-air connection establishment,
the SSNDPG shall allocate a logical channel number in
the range I to 127, by choosing the lowest numbered logical
channel in the ready state in that range. For a new air-toground
connection setup, the SSNDPA shall allocate a logical
channel number in the range 128 to 255, by choosing the
highest numbered logical channel in the ready state in that
range.
The SSNDPX virtual call (VC) service shall proceed through
three distinct phases:
a) connection establishment;
b) data transfer; and
C) connection release.
Note.- The SSNDPX is specified in terms of Locally originared,
or remotely originated operations. Locally originated
speciJes the procedure at the SSNDPX for handling operutions
originating from a local SNS user; while remotely
originated specifies the procedure at the SSNDPX for handling
operations originating from a remote SNS user:
4.7.3.5 CONNECTIOENS TABLISHMENT
Note.- Up to I28 octets of user data may be transferred
during connection establishment.
4.7.3.5.1 The connection establishment procedure shall
apply independently to each establishment request.
4.7.3.5.2 User data shall be transparently forwarded in
both directions.
4.7.3.5.3.1 Nonnal operation
4.7.3.5.3.1.1 When the SSNDPX receives a call request
packet from the IWF, it shall allocate a logical channel which
is in the ready state, forward the call request packet to the
remote SSNDPX by means of a connection request SNPDU
and place the logical channel into the IWF call request state.
4.7.3.5.3.1.2 If the call is accepted at the remote
SSNDPX, a connection confirm SNPDU is received. The
SSNDPX shall then place the logical channel in the data
transferlflow control state (flow control readylno remote or
local intermpt pending) and forward a call connected packet
to the IWF, The call connected packet shall use default values
(if any) for the facilities which are not transmitted over the
satellite subnetwork, according to the SNPDU to packet
mapping rules defined in 4.7.3.16.
4.7.35.3.1.3 If the SSNDPX does not receive either a
connection confirm or connection released SNPDU from the
remote SSNDPX before the timer (see tN1, Table 4-18)
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