Nera Inmarsat-c Service Manual page 146

0
Row
1
2
:
:
:
:
:
:
:
:
62
63
25 row
( Last frame )
Preambling
For easy synchronization at the receiving side, the preamble is added to the top of the
message channel data. Preamble consists of the carrier recovery (128 bits) and the
clock regeneration (64 bits).
n frame
(max : 50)
DATA UW
Column
0 1 2 .................................... 161
1 65
2 66
3 67
63 127
64 128
..................
Fig. AP1.3.10 Permuting
2nd frame
...............
DATA UW
clock regeneration :
64bits
Fig. AP1.3.11 Preambling
AP1-25
AP1.3 Channel types and Signal processing
10177
10177
10177
10239
10240
1sd frame
10240bits 128bits
DATA UW Preamble
carrier recovery : 128bits
all = 1
39 row 0 row
( 1st frame )