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DB929B Datasheet(PDF) 15 Page - CML Microcircuits

Part # DB929B
Description  Full Data Packet Framing
PDF  51 Pages
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Manufacturer  CMLMICRO [CML Microcircuits]
Direct Link  http://www.cmlmicro.com
Logo CMLMICRO - CML Microcircuits

DB929B Datasheet(HTML) 15 Page - CML Microcircuits

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4-Level FSK Modem Data Pump
Page 15 of 50
MX929B PRELIMINARY INFORMATION
©2001 MX-COM, INC.
www.mxcom.com Tel: 800 638 5577 336 744 5050
Fax: 336 744 5054
Doc. # 20480171.003
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies.
4.4
Frame Structure
The MX929B Frame Structure as used in a RD-LAP
¥ system is illustrated in Figure 7, and consists of a
Frame Preamble (comprising a 24-symbol Frame Synchronization pattern and Station ID block), followed by a
'Header Block', one or more 'Intermediate Blocks', and a 'Last Block'. Channel Status (S) symbols are
included at regular intervals. The first Frame of any transmission is preceded by a Symbol Synchronization
pattern.
0
1
2
3
54
6
7
0
1
2
3
54
6
7
FEC TRELLIS CODING / DECODING
(ERROR CORRECTION)
INTERLEAVING / DE-INTERLEAVING
02
34
5
29 30 31 32
64 65
1
Byte 11
2
1
0
22 Symbols
22 Symbols
22 Symbols
SS
S
Byte 0
Byte 1
00
'000'
0
77
7
Symbol
Sync
Frame
Sync
S
Station
ID
'Header'
Block
S
24
24
1
22
1
69
Frame
Preamble
Intermediate Blocks
Packet (1 to 44 Blocks)
69
69
69
'Last'
Block
Frame
Sync
Next Frame
(Optional)
Frame
-1 +1
-1 +1 -1 +3 -3 +3 -3
-1
+1 -3 +3 +3
-1 +1 -3
-3 +1 +3 -1
-3
+1 +3
+3 +3
-3
-3 +3 +3 -3
-3 +3 +3
-3 -3 +3 +3
-3
-3
-3
+3
+3
-3
-3
-3
+3 +3
S: Channel Status Symbol: +3 = Busy, +1 = Unknown, -1 = Unknown, -3 = Idle
Frame Sync:
Symbol Sync:
sent first
last
Over-air Signal
(symbols)
Block:
0
1
2
3
54
6
7
Last Block
Intermediate Blocks
Header Block
4
5
6
7
8
9
10
11
0
1
2
3
µC binary data stored
in MX929B data block
memory configured as
header, intermediate, or
last block by MX929B
task being executed.
Byte
FEC TRELLIS CODING / DECODING
(ERROR CORRECTION)
89
10
0
12
Byte 0
Byte 1
Byte 2
Byte 3
Data Bytes
(0-8)
--------------
Pad Bytes
(0-8)
Address
&
Control
(10 bytes)
Data Bytes
(12 bytes)
CRC2
(4 bytes)
CRC1
(2 bytes)
70
70 70
2
'000'
0
21
1
20
tri-bits
4-level
symbols
0
1
2
3
54
6
7
0
1
2
3
Station ID
lsb
msb
CRC0
System ID
Domain ID
Base ID
Byte
Figure 7: Over-Air Signal Format



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