HIGH DATA RATE RECEIVER
HDR-4G+ USER’S MANUAL
Ref. DTU 100782
Is.Rev 3.5
Date: June 1, 2021
© Safran Data Systems – IMP000074 e14r1
This document is the property of Safran Data Systems.
It cannot be duplicated or distributed without expressed written consent.
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:
Source information in packets : Blank bytes and randomized block Ri
Reed Solomon RS (254,238, t=8) error protected packet
Randomized transport packets : Sync bytes and interleaved randomized block IRi
2040 (I=8) or 3824 (I=16) bytes
PRBS trunc. Period = 2023 (I=8) or 4063 (I=16) bytes
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