Siemens SWT-3000 Equipment Manual page 16

SWT 3000 Equipment Manual
2-wire connections
© SIEMENS AG 2008
2-wire cable connections can be implemented with the narrow band ver-
sions of the SWT 3000.
SWT 3000
NB12
T
R
NBx Narrowband Version
Figure 7: Example of a 2-wire connection with narrow band versions
In this case the receiver input of the SWT 3000 is connected parallel to
the transmitter output. Since there is only one wire pair available for the
transmit and receive direction, different frequencies must be used.
The variants listed in the following table are provided for this.
Table 3: Narrow band variants for VF 2-wire connections
Direction Variant NB12:
Reverse Variant NB21:
direction
Direction Variant NB13:
Reverse direc- Variant NB31
tion
Direction Variant NB23
Reverse direc- Variant NB32
tion
Edition p3_3_2x 08/09
Functional Description
Transmit channel 1 Receive channel 2
Transmit channel 2 Receive channel 1
Transmit channel 1 Receive channel 3
Transmit channel 3 Receive channel 1
Transmit channel 2 Receive channel 3
Transmit channel 3 Receive channel 2
SWT 3000
NB21
T
R
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