Safran CORTEX Series User Manual page 106

The synchronization marker of the frame (corresponding to the first block of 254 bytes) is B8 (in
hexadecimal) and the separation between the other 15 (7) blocks of the frame is made by a marker
whose value in hexadecimal is 47 when the medium data rate is used.
For high data rates interface, the equipment has the capacity for inserting filling frames. The
synchronization marker for those filling frame are specific. 96 (in hexadecimal) for the first block and 69
for the 15 (7) following blocks.
It should be noticed that at the receiver side, those filling packets have to be removed.
The succession of the three processes described here above give the way to:
PRBS trunc. Period = 2023 (I=8) or 4063 (I=16) bytes
17
R1a
blank
238 bytes
bytes
Source information in packets : Blank bytes and randomized block Ri
Sync
or sync i
Reed Solomon RS (254,238, t=8) error protected packet
IR1a
Sync
238 bytes
Randomized transport packets : Sync bytes and interleaved randomized block IRi
© Safran Data Systems – IMP000074 e14r1
HIGH DATA RATE RECEIVER
HDR-4G+ USER'S MANUAL
17
R2a
blank
238 bytes
bytes
Ri
238 bytes
2040 (I=8) or 3824 (I=16) bytes
Sync
IR2a
2
238 bytes
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It cannot be duplicated or distributed without expressed written consent.
Ref. DTU 100782
Is.Rev 3.5
Date: June 1, 2021
17
17
R8a or 16a
blank
blank
238 bytes
bytes
bytes
254 bytes
Sync
IR8a or 16a
Sync
8/16
238 bytes
Safran Data Systems
R1b
238 bytes
RS redund.
16 bytes
IR1b
238 bytes
.
Page 106