Communication solutions for power utilities
1U SHELF TYPE MAS-2
WITH ASYNCHRONOUS PROGRAMMABLE MODEM MAFP - Rev. 9 (January 2018)
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Frequency shifting
From
30 Hz to
800 Hz, according to speed
Nominal bandwidth at 0.2 dB
- At 50 Bd/
30 Hz:
121 Hz,140 Hz
(1)
- At 100 Bd/
60 Hz:
123 Hz
- At 200 Bd/
120 Hz:
245 Hz
- At 200 Bd/
90 Hz:
185 Hz
- At 200 Bd/
60 Hz:
126 Hz
- At 600 Bd/
180 Hz:
715 Hz
- At 1200 Bd/
400 Hz: 1405 Hz or 1435 Hz,
depending on whether the modem works in
superimposed band or not.
At 2400 Bd/
800 Hz: 3016 Hz
Figure 3 to Figure 11 show, for each speed
and as an example, the response curve of the
transmission and reception filters at a
determined frequency
Line-frequency stability
<
0.5 Hz across the whole temperature range
Transmission level
30 dBm to 0 dBm, over 600
.
Continuous adjustment in two ranges
Difference in levels between
line frequencies
<
0.5 dB across the whole temperature range
Output impedance
Selectable by means of jumper between:
600
.
High impedance: >6 k
up to 600 Hz.
>10 k
between 600 Hz and 3800 Hz
Return loss
>18 dB between 420 and 3800 Hz
(1)
The only transmission speed for which the transmission and reception filters are not the same is 50 Bd.
The bandwidth of the reception filter is of 121 Hz whilst that of transmission is of 140 Hz.