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utilization of approximately 70 per cent (of theoretical
capacity) for these channel types. Higher utilizations are
permitted, provided that all of the applicable performance
standards are met. For example, a GES that operates multiple
T channels in an appropriate muftiserver configuration may be
abb to achieve T channel utilization factors of 80 per cent or
more within the constraints imposed by the speed of service
7.2.2.6.1 Transit delay is a standard speed of service
performance measwe for single DPirA packets; transit delay is
defined as an average value. Because the civil aviation
community typically does not rely on average values for the
most critical @ormame measures, the 95 per cent data
transfer delay is also specified. Under actual operational
conditions, the relationship between the average and 95 per
cent delay values is not fixed, but may &pend on the
distribution of trafpic. A typical statistical distribution of toaircraft
delays, under projected peak trafIic loading and at the
lowest P c h n e l rate, is illustrated in Figure A-15 of this
guidance material for the highest and lowest priority of data.
A typical statistical distribution of from-aircraft delays under
similar conditions is shown in Figure A-16 of this guidance
material. From-aircraft delays are independent of priority
unless two or more from-aircraft packets contend for resources
within a particular AES. The extent to which such internal
contention may occur within a particular AES will depend on
the avionics architecture of the aircraft in which the AES is
installed.
7.2.2.6.2 Transit delay and 95 per cent data transfer delay
are specified on the basis of a standard reference DATA packet
containing 128 octets of subnetwork.usex data. Actual delays.
for shorter packets may .be reduced, but not necessarily in
proportion to the packet length. The delay parameters
associated with DATA packets shatter than 128 octets (of
subnetwork user data) should not exceed the corresponding
parameters for 128 octet DATA packets.
Throughput is the standard speed of service performaice
parameter for the transfer of multiple DATA packets. In
accordance with current industry practices, throughput is
computed on the basis of standard reference DmA packets
-2/lUoO No. 75
Attuchrnent A to Part Z Annex 10 - Aeronuutical Telecommunications
containing 128 octets of subnetwork user data. Throughput is
computed for the transfer of multiple independent packets.
Throughput performance for the transfer of M-bit sequences
may be substantially higher. The subnetwork is expected to
support the minimum throughput values shown in Table A-1 1.
7.2.2.8 Cowerion establishwnr d e b
connection releare delay
7.2.2.8.1 Connection establishment &lay. The maximum
connection establishment delay is based on a connection
request of the lowest priority, containing a total of 15 octets of
address information and 42 octets of facility fields and
optional data The specified value for each channel rate applies
to an equal mix of GES-origillitted requests and AESoriginated
requests. The maximum connection establishment
&lay is the standard speed of service specification for the
connection establishment phase; it is not intended to limit in
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.
7.3 Satellite subnetwork dependent
protocol services and operations
7.3.1 LOGICACLH ANNELS
aonr ya dwdarye ss fiefldush. c use of oplional facilities, user data fields, Tinhteen dquediR tmo epnrtesv entf ocra lsl ecloelcliksiinognl so. gical chaancl numben are
7.2.2.8.2 Connection release &lay. The maximum
connection release delay is based on a disconnect request at
the lowest priority, cmtainiqg no user data, invoking no
optional facilities and carrying m address information. The 7.3.2.1 The following describes a normal connection
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when the connection reiease is not delayed by the presence of 7.3.2.2 When a subnetwork connection is initiated by one
　
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