Nera saturn bp Technical Manual page 23

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)
In-band Signalling Mode (CLEARING)
OQPSK Encoded Signal
(OQPSK = Offset Quadrature Phase Shift Keying)
0° +90° +270° +180°
t
SIGNALLING UNIT – SU
BIT No.
8 7 6 5 4 3
Message type
MES ID
LES ID
cause class cause location
coding
spare cause value
std.
spare
MES transmit
channel number
MSB
CCITT CRC
M10
CHANNEL RELEASE
Saturn Bp Portable – Technical Manual
LES
0° +90° +270° +180°
24 ms n x 240 ms
END OF
DATA
192 bits
2 1
8A
1
2
3
4
5
6
7
8
LSB 9
Octet No. 12 Octet No. 11 Octet No. 10
10
1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0
11 CF 3B 21
H H
12
CCITT CRC MES TRANSMIT
(CYCLIC REDUNDENCY CHECK) CHANNEL NUMBER
RF Units
Duplexer
HPA
Combiner/splitter
240 ms
IN-BAND SIGNALLING FRAME
1920 bits
60 ms 60 ms
SU SU
SUBFRAME - 4 SUBFRAME - 3
Octet No. 9 Octet No. 8 Octet No. 7 Octet No. 6
4C 00 11 00
H H H H
SPARE
SIGNAL UNITS = 12 "OCTETS" = 96 BIT SIGNALLING UNIT.
EXAMPLE: SCPC "IN-BAND SIGNALLING" MODE (CHANNEL RELEASE)
f = 1626.5 - 1660.5 MHz
LNA
240 ms
IN-BAND SIGNALLING FRAME
1920 bits
60 ms 60 ms
SU SU
SUBFRAME - 2 SUBFRAME - 1
60 ms
SUB * UW CW
SU1 SU1 SU1
32 bits 24 bits 24 bits
8 384 bits 8
bits bits
96 BIT Before FEC
SIGNALLING UNIT coding
6 bits 6 bits
Octet No. 5 Octet No. 4 Octet No. 3 Octet No. 2
09 9F
H H H
LES ID MES ID
Clearing
BIT CONTIN.
TIMING WAVE
64 bits 96 bits
* Unique Word:
0111 1000 1001
for 1st subframe, and
1000 0111 0110
for 2nd, 3rd and 4th
subframe (compliment)
Octet No. 1 SUB-BAND
SIGNALLING
CHANNEL
8A
H
MESSAGE
TYPE
21