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4.8.4.1.1.2 GES C channel assignment delay. The maximum
time delay for a GES to enqueue a "C channel
assignment" CM-LIDU for service by the P channel link layer
after an "access request" CM-LIDU has arrived at the GES
link layer shall be 1.5 seconds (95th percentile).
4.8.4.1.1.3 AES C channel assignment response delay.
case path geometry) and vocoder frame emission delay
respectively. Allocating 0.040 second for vocoder frame
emission delay pmvides for worst case synchronization where
the first 0.020 second vocoder speech frame is delayed by an
additional C channel interleaver block.
Note 2.- Total trander delay for the AMS(R)S subnetwork
is defined as the elapsed time commencing at the instant that
speech is presented to the AES or GES and concluding at the
instant that the speech enters the interconnecting network of
the countelpart GES or AES. This delay includes vocoder
processing time, physical layer delay, RF propagation delay
and any other delays within the AMS(R)S subnetwork.
The probability of misrouting caused by internal processing or
signalling errors within the GES shall not exceed 1 in lo6.
The maximum time delay for an AES to begin iansmitting-a
C channel carrier after a "C channel assignment" CM-LIDU Note.- Misrouting can occur if the GES misinterprets ( I )
has arrived at the AES link layer shall be 1.0 second (95th the network-ID or ground address digits contained in an
percentile). "access request - telephone" CM-LID U Cfor air-originations)
or (2) the AES-ID or terminal-ID contained in a FZTE 18
4.8.4.1.2.1 GES C channel assignment delay. The
maximum time delay for a GES to enqueue a "C channel
assignment" CM-LIDU for service by the P channel link layer
after a call origination event (FITE 18, see Table 4-41) has
arrived at the terrestrial network interworking interface shall
be 1.5 seconds (95th percentile).
4.8.4.1.2.2 AES C channel assignment response delay.
The maximum time delay for an AES to begin transmitting a
C channel carrier after both a ''call announcement" CM-LIDU
and a "C channel assignment" CM-LIDU have arrived at the
AES link layer shall be 1.0 second (95th percentile).
Note.- The AES procedures .for ground-originuted calls
require an AES to await the successful receipt of both CMLIDUs
before C channel transmission can begin. These
procedures include error-recovery logic to hurdle their
potentlal receipt out of normal ordel:
418.4.2.1 The total allowable transfer delay within h e
AMS(R)S subnetwork on a C channel operating at 21.0 kbits/s
shall be no more lhan 0.485 second.
. .
received from the interworking interface with the terrestrial
network Cfor ground-originations).
4.8.5 Circuit-mode voice
encodingldecoding
4.8.5.1 Circuit-mode voice. For circuit-mode voice, the
appropriate voice encodingldecoding algorithm for the AES
and GES shall be used for each C channel as indicated below.
4.8.5.1.1 21.0 kbits/s C channel. A 9.6 kbitsis
encodingldecoding algorithm (see Appendix 7 to Chapter 4)
shall be used with a 21 kbitds C channel (see 4.4.5).
Note.- The voice encoding algorithm is subject to BT
(formerly British Telecom) patent rights and copyrighzs. BT
has agreed to granr royalty-free nun-exclusive licences under
such patent rights and copyrights to all manufacturers qf AES
and GES implementations for civil aeronautical mobile
satellite communications only (which include AMSS atul
AMS(R)S communications, as provided in Chapter 4). These
rnunufucturers shozlld enter info a royalty-free licence
agreenzerlt with BT Laboratories prior ro incorporating fne
algorithm in eqtiipnzents for civil aeronautical mobile satellite
conln~~unicatiorrs.
211 woo
No. 75
Annex 141 - Aeronautical Telecommunications Volume 111
4.8.5.1.2 8.4 kbits/s C channel. A 4.8 kbitsfs
encodingldecoding algorithm shall be used with an 8.4 kbits/s
C channel (see 3.4.5).
Note.- information on technical characteristics of the
idustry standard 4.8 kbits/s encoding/decoding algorithm is
contained in the docament "Low Level Descriplion", version
number 1.5, dated 3 May 1996. and developed by Digital Voice
Systems Inc, (DVSI), United States.
The 4.8 kbits/s encoding/ctecoding techllology described in
the docunzent is subject to DVSI patent rights and copyrights.
Manufacturers must enter into u licence agreement with DVSI
prior to obtaining a detailed description of the algorithm
before incorporation in equipment operating in the AMSS
service. By letter to ICAO dated 10 November 1998, DVSI
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