[dwblctam-051011-01.tif, 2, en_US]
Figure 10-3
Block Diagram of the Transmit Amplifier
The output of the transmit section is again protected against any interference voltages from the transmission
path. The desired signal can be measured via an isolating amplifier. Depending on the frequency, a correction
value has to be added to the measured signal level to get the amplitude of the output signal to the PU4
module for test purposes. Interpolate linearly between the frequency points.
Table 10-1
Correction values
dB
Hz
6.8
300
5.1
350
5.2
400
5.3
450
4.9
500
4.3
550
3.7
600
1.8
800
0.8
1000
0.1
1300
-0.4
2300
-0.8
2800
-0.9
3300
-1.4
3800
-1.5
3900
-1.7
4000
The PU4 monitors this measured value and generates the transmitter alarm from it. The output voltage for the
100 % value is 4.5 V. A protective circuit restricts this voltage to m5 V.
If any faults occur in the SWT 3000 unit, faulty signals must not under any circumstances be transmitted to the
distant station. For this reason, the transmitter output can be short-circuited via a relay. The PU4 module
(PON_PU signal) drives this relay, which is only enabled if the unit is operating properly.
Alarm Displays
The alarm signals generated by the PU4 module are displayed via red LED on the front panel of the SWT 3000.
LED are provided for the following alarms:
10.1.4
Copper Line Equipment Module
10.1 Function Description
342
Smart Communication, SWT 3000 Teleprotection, Equipment Manual
C53000-G6040-C605-1, Edition 03.2020
