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S y s t e m D e s c r i p t i o n
S y s t e m D e s c r i p t i o n
S y s t e m D e s c r i p t i o n
ADE
Forward Direction
MES
NCS Common Channel (NCSC)
BPSK Encoded Signal
(BPSK = Binary Phase Shift Keying)
shift
shift
SIGNALLING UNIT – SU
BIT No.
8
7
6
5
4
3
2
Message type
MES ID
LES ID
spare
priority
spare
service nature
service type
channel parameters
destination terminal ID
spare
message number
CCITT CRC
M1
CALL ANNOUNCEMENT
Saturn Bp Portable – Technical Manual
NCS
shift
shift
shift
FRAMING
RATE - 1/2 FEC CODED BITSTREAM
BITS
32
TIMESLOT
TIMESLOT
TIMESLOT
TIMESLOT
0
1
2
1
81
1
96 bits
96 bits
96 bits
2
3
4
5
6
Octet No. 1
Octet No. 2
7
1 0 0 0 0 0 0 1 1 1 1 0 1 1 0 0 1 1 0 1 1 1 0 1 0 0 0 1 1 0 0 0 0 0 0 0 1 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 1 0 1 0 1 0 0 0 0 1 0 0 1 1 0
81
EC
8
H
H
9
MESSAGE
TYPE
10
11
12
RF Units
Duplexer
HPA
t
Combiner/splitter
Approx. 264 ms
FRAMING
RATE - 1/2 FEC CODED BITSTREAM
BITS
1552 bits
32
Approx. 264 ms
TIMESLOT
TIMESLOT
TIMESLOT
TIMESLOT
3
4
5
6
7
96 bits
96 bits
96 bits
96 bits
96 bits
Octet No. 3
Octet No. 4
Octet No. 5
Octet No. 6
DD
18
09
00
H
H
H
H
MES ID
LES ID
SIGNALLING UNIT = 12 "OCTETS" = 96 BITS
EXAMPLE: CALL ANNOUNCEMENT (TYPE 81
f = 1525 - 1559 MHz
LNA
FRAMING
BITS
1552 bits
32
MULTI
FRAME
8 bits
Octet No. 7
Octet No. 8
Octet No. 9
Octet No. 10
01
01
01
H
H
H
CHANNEL
DESTINATION
PARAMETERS
TERMINAL ID
)
H
Idle State
RATE - 1/2 FEC CODED BITSTREAM
1552 bits
Octet No. 11
Octet No. 12
00
54
26
H
H
H
CCITT CRC
(CYCLIC REDUNDENCY CHECK)
15
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