Nera saturn bp Technical Manual page 21

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
Return Direction
MES
SCPC channel (Single Carrier Per Channel)
OQPSK Encoded Signal
(OQPSK = Offset Quadrature Phase Shift Keying)
0° +90° +270° +180°
t
SIGNALLING UNIT – SU
BIT No.
8 7 6 5 4
Message type
MES ID
LES ID
spare
MES receive
channel number
MSB
scrambling vector
CCITT CRC
M25
MES CONNECT
Saturn Bp Portable – Technical Manual
LES
Sub-band
0° +90° +270° +180°
24 ms
END OF
DATA
192 bits
3 2 1
8A
1
2
3
4
5
6
LSB
7
8
9
Octet No. 12 Octet No. 11 Octet No. 10
10
1 0 1 0 0 1 1 1 1 0 0 0 0 1 0 1 0 1 0 0 1 1 1 0 0 1 1 1 0 1 1 1 0 0 0 1 1 1 0 0 0 1 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 1 1 0 0 0 1 0 1 0 1 1 0 1 1 0 0 0 1 0 0 1 1 1 1 1 1 0 0 1 1 0 0 1
11
A7 85 4E
H H
12
CCITT CRC SCRAMBLING VECTOR
(CYCLIC REDUNDENCY CHECK)
RF Units
Duplexer
HPA
Combiner/splitter
n x 240 ms 240 ms
VOICE FRAME
1920 bits
60 ms 60 ms
VOICE VOICE
SUBFRAME - 4 SUBFRAME - 3
Octet No. 9 Octet No. 8 Octet No. 7 Octet No. 6
77 21 4C 00
H H H H
MES RECEIVE SPARE
CHANNEL NUMBER
SIGNALLING UNITS = 12 "OCTETS" = 96 BITS = 24 BITS FROM EACH OF THE 4 VOICE FRAMES
EXAMPLE: MES CONNECT
f = 1626.5 - 1660.5 MHz
LNA
240 ms
VOICE FRAME
1920 bits
60 ms 60 ms
VOICE VOICE
SUBFRAME - 2 SUBFRAME - 1
60 ms
VOICE FIELD
384 bits
8 bits
VOICE FIELD
384 bits
8 bits
Digital input from
voice encoder
Octet No. 5 Octet No. 4 Octet No. 3 Octet No. 2
09 8A D8 9F
H H H H
LES ID MES ID
Voice
BIT CONTIN.
TIMING
WAVE
64 bits 96 bits
* Unique Word:
0111 1000 1001
for 1st voice frame, and
1000 0111 0110
for 2nd, 3rd and 4th
subframe (compliment)
SUB * UW CW
32 bits 24 bits 24 bits
8 bits
SUB
Scrambled
24 bits
6 bits
MES_SIG
Octet No. 1
SIGNALLING
CHANNEL
99
H H
MESSAGE
TYPE
19