User`s manual

CLARION M10 SERIES STRUCTURE
M10 SERIES USER’S MANUAL PAGE 8
Figure 2.3.1 shows the encapsulation process described above.
Figure 2.3.1
Preamble
F
S
SourceDest. CRC
SourceDest.
RF MAC
Header
FEC Encoded Frame
RF PHY
Header
ACROSS MAU INTERFACE
IN TX FIFO
OUT OF FEC ENCODER
FROM MODEM
Standard
802.3 or
Ethernet II
LLC data
L
or
P
MAC preamble & frame
sync are removed; RF
MAC header is added.
If FEC coding is
employed, then it
protects everything.
2.3.2 DOWNLOAD PROCESS
The Download is defined as a data flow from the M10 to an Ethernet
device. During Download, it provides the following:
• Detection of and time alignment to received radio signal.
• Demodulation of PHY header and MAC frame.
• FEC decoding when the M10 recognizes that the received frame
is FEC encoded by reading PHY header.
• Checking of 32-bit CRC (generated by an Ethernet card that
Uploaded the frame).
• Conversion of serial stream to bytes for storing in FIFO.
• Regeneration of the Ethernet preamble and frame sync.