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12 + RND (O,Zk - l)*Ts (Notes 2, 4)
10
10
10
Unassigned
20 to 30
10
15 + RND (O,Zk - 1 ) T s (Notes 2, 4)
Unassigned
Tch (Note 3)
Unassigned
5
Tch (Note 3)
10
10
K *Tch, K = 2 (Note 3)
10
20
10
Tch (Note 3)
20
10
Tch (Note 3)
5
(No. of SUs)*Tch (Note 3)
5
(No. of SUs)*Tch (Note 3)
15
120 to 240
Unassigned
4 + 2* (P-Ch frame duration)
NOTES
I. Multiple timers as required. indicated by suffix (i).
2. Zk = ZO * 2k, Zo = 4 normally; Ts = R channel slot
duration and k is the number of retries; k = 0 for initial
transmission.
3. Tch = time required to transmit 1 SU on sub-band C
channel, e.g. 0.167 seconds for 21 000 bit& channel.
4. RND(x,y) = function that randomly selects an integer value
from the interval [x,y]; all integers in the interval are
equally probable.
2JlUoO
No. 75
156A ANNEX 10 - VOLUME 111
Part I Annex 10 - Aeronautical Telecommunications
THIS PAGE INTENTIONALLY LEFT BLANK
Y1W)O
No. 75
Appendix 5 to Chapter 4
INTERWORKING TELEPHONY EVENT MAPPING
Parameter Mapping:
FITE PARAMETER 1 LlCl PARAMETER CODING
MAPS INTO:
CPCl (Calling Party Category Indicator) Q Number
Network ID I 0
Event Name:
AMS(R)S Call Origination
(Calling Party Category Indicator, Subscriber, Call with Priority)
! (AMStRIS Terrestrial Voice Network)
AMS(R)S CM-LIDU:
Access Request - Telephone
and
Call Information - Service Address
B service ID I
Procedure Usage:
AES Outgoing
3 Circuit Data Rate 0
': Voice Channel Characteristics 2or3
, Source I
- Service Direction 3
:. Application Reference Number (Variable)
i. Message Type 20123 (hex)
! Routinn R channel
Comments:
This parameter mapping is applicable to the "Access Request - Telephonen CM-LIDU only.
Message type 23 (hex) carresponds to the 'Abbreviated Access Request - Telephone" SU.
Message type 20 (hex) corresponds to the "General Access Request - Telephone" SU; and in this case,
only the first two digits of the ground address are transmitted with this CM-LIDIJ.
Network ID = 10 is applicable if there is a private AMS(R)S terrestriaI voice network.
ANNEX 10 - VOLUME 111
Figure A5-1 a)
157
Annex 10 - Aeronautical Telecommunicntions Volume Ill
Parameter Mapping:
FlTE PARAMETER w LICI PARAMETER CODING
Called Party Number Address Digit 2-9
CONTINUED
MAPS INTO:
I Ground Address .......................... .;'. .............................................................. b (Variable)
~ ~ -
Calling Party Subaddress $ Calling Terminal
Aircraft Audio System Channel ....i .... ..........................................................) (Variable)
Event Name:
AMS(R)S Call Origination
(Calling Party Category Indicator, Subscriber, Call with Priority)
k Message Type 8 21 (hex)
AMS(R)S CM-LIDU:
Access Request - Telephone
and
Call Information - Service Address
' Routing
Procedure Usage.
AES Outgoing
C channel sub-band
Comments:
This parameter mapping is applicable to the 'CalI Information - Service Address" CM-LIDU only.
Figure A5-1 b)
211 1l00
No. 75
Appendix 6 to Chapter 4
AMS(R)S CONFIGURATION PARAMETERS
Table A6-1. Circuit-mode configuration parameters
Parameter Description Value
nA2 1 Length of CM-LIDU series for distress/urgency air-originations 4
nA22 Length of CM-LIDU series for fight safety air-originations 3
nA23 Length of CM-LIDU series for regularity/metwrological air-originations 2
ANNEX 10 - VOLUME 111
Appendix 7 to Chapter 4
VOICE ENCODING ALGORITHM DEFINITION
1. INTRODUCTION
Interoperability of equipments utilizing the 9.6 kbitsis LPC
codec operating in the AMS(R)S service can only be ensured
if all provisions of this algorithm definition are fully complied
with.
Note 1.- Refer to Figure A7-I* for a schematic
representation of the algorithm.
Note 2.- The flow and processing of information within the
algorithm is defined with the use of the Pascal language.
individual implementations of this algorithm need not use this
language.
Note 3.- All scalar variahle names are depicted with a
simple nume. All vector variable names are depicted with a
simple name followed by paired bruckcts ([lI
2. REQUIREMENTS FOR
NUMERIC CALCULATIONS
Except where explicitly noted, and except for obvious integer
variables such as vector indices and loop counters, all variables
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