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preserved from one end of a subnetwork connection to the tr@c muy be subject to additional delay, depending on the
other. amount and rate of frum-ai~crafr trafic loading.
Minimum
channel rate
in use by AES
(bitsis j
2flVoO
No. 75
Maximum data mansit delay (seconds)
To-aircraft
Highest Lowest
priority priority
service service
From-aircraft
Highest
priority
service
Part I Annex 10 - Aeronautical Telecommunicalions
4.7.2.2.3 DATA TRANSFER DELAY (95 PERCENTILE)
Note.- In accordance with IS0 8348, 95 per cent data
transfer delay values are based on a fied SNSDU length of
128 octets. 95 per cent data transfer delay is defined in
4.7.2.1.2.
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
Data transfer delay (95 percentile) shall not exceed the
following maximum values:
4.7.3.1 GENERALP ROVISIONS
Note.- In any particular AES, lower priority from-aircraft
trafic may be subject to additional delay, depending on the
amount and rate of from-aircraft trafic loading.
Minimum
channel rate
in use by AES
(bitsis)
4.7.2.2.4 CONNECTIORENL LQSE DELAY
The connection release delay (95 percentile) shall not exceed
30 seconds.
Maximum data transfer delay
(95 percentile)
(seconds)
4.7.2.3 RELIABILITY OF SERVICE
To-aircraft
Highest Lowest
priority priority
service service
4.7.2.3.1 RESIDUAL ERROR RATE
From-aircraft
Highest
priority
service
The residual emr rate in the from-aircraft direction shall not
exceed lo4 per SNSDU. The residual error rate in the toaircraft
direction shall not exceed lod per SNSDU.
Note.- Residual error rate includes the probability of
zwzdetected errol; the probability of losing an SNSDU, and the
probability of duplicuiing an SNSDU.
4.7.2.3.2.1 The probability of an SNC provider-invoked
SNC release shall not exceed lo4 over any one-hour interval.
Note.- Connection release resulting from eiiher GES-to-
GES handover or AES log-oJ or VC pre-emprion are excluded
from this spect/Ecution.
Since the functional differences between the SSNDPA and
SSWPG are minimal, their operations shall be described in
terms of SSNDPX where X shall stand for either A or G.
Where differences do occur, the SSNDPA and SSNDPG
functions shall be described individually.
4.7.3.2 SATELLITSUEB NETWORK-DEPENDENT
PROTOCOL ENTITIES
Note+- At leust one pair of SSNDPA and SSNDPG entities
exists between each puir of AES and GES. Figure 4-12 shows
two pairs of SSNDPA and SSNDPG entities between two AESs
and a GES.
4.7.3.2.1 The SSNDPX defined in chis section shall
pertain to each SSNDPX entity.
4.7.3.3 LOGICAL CHANNELS
Note.- The connections between SSNDPAs and SSNDPGs
are established through logical charnels. Up to 255 logical
channels may be established between each pair of SSNDPX
entities. Euch logical channel is identified by its own logical
channel number (LCN) rangingfrom .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 1 to 127, by choosing the lowest
numbered logical channel in the ready state in that range. For
a new air-to-ground 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.
Annex 10 - Aeronautical l"ekcomrnlcnicati~ons Volume llI
Note.- Tlte SSNDPX is specijied in tenns of locally
originated, or remotely originated operations. Locally
originated specifies the procedure at the SSNDPX for handling
operations originating from a local SNS usel; while remotely
originated specifies the procedure at the SSNDPX for handling
operations originatihg from a remote SNS user:
4.7.3.5 CONNECTIOENS TABLISHMENT
Note.- Up to 128 octets of user datu 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 LOCALLY ORIGINATED
3.7.3.5.3.1 Nonnal operation
4.7,3.5.3.1.1 When the SSNDPX receives a call request
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