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Field Service Ver. 7.0 Jan. 2009
H. Others
(1) Minimum reception signal level (RLSD) (half-duplex mode only)
• The reception circuit is turned to On when the signal becomes 43 dBm or more
• When the signal becomes 48 dBm or less, the reception circuit is turned Off within 20 to
25ms after it has exceeded the thresh old.
(2) Data frame structure
• All data transmitted in V.34 (after the Phase 4) is treated in the following frame format.
J
:The number of data frames within one super frame
P
:The number of mapping frames within one data frame
Super frame
Data frame
Mapping frame
Four-dimensional symbol
Modulation Speed
2400 baud
2743 baud
2800 baud
3000 baud
3200 baud
3429 baud
Y104784-2
280ms
1
0
40 or 35ms
0
1
J=0
1
2
3
K=0
1
J
7
8
7
7
7
8
Service Manual
2. COMMUNICATION CONTROL
...
...
P-1
P
12
12
14
15
16
15
J-1
45
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