Description of the SHDSL permanent line modem
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PHOENIX CONTACT
1-13
Figure 1-10
Star structure with SHDSL devices (1), RS-485 on all devices
In order to configure the above structure, you must proceed as follows:
•
Divide the overall structure into several lines (sections A, B, C)
•
Configure each line individually via the PSI-CONF configuration software.
We recommend beginning with the critical line. These, for example, are long lines with
many devices and small cable diameters.
Another example
Figure 1-11
Star structure with SHDSL devices (2), RS-485 on all devices
In this example the termination device for line C is not in the head station. The sequence is
the same as above (see Figure 1-10 on page 1-13).
A1
B1
A
B
C
T-BUS
A2
A3
A4
A5
C3
B2
C2
C1
RS-485
B1
C2
C1
A
B
C
A5
C3
B2
T-BUS
C4
A1
A2
A3
A4
RS-485