Alarm Displays - Siemens SWT 3000 Equipment Manual

Copper Line Equipment Module
10.1 Function Description
[dwblctam-051011-01.tif, 2, en_US]
Figure 10-3
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
dB
6.8
5.1
5.2
5.3
4.9
4.3
3.7
1.8
0.8
0.1
-0.4
-0.8
-0.9
-1.4
-1.5
-1.7
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 maximum +5 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.
10.1.4

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:
342
Block Diagram of the Transmit Amplifier
Correction values
Hz
300
350
400
450
500
550
600
800
1000
1300
2300
2800
3300
3800
3900
4000
Smart Communication, SWT 3000 Teleprotection, Equipment Manual
C53000-G6040-C605-1, Edition 03.2020