Siemens SCALANCE X-300 Configuration Manual page 249

has increased, for example due to aging or a defect. The longer the cable being used, the
lower the link power margin available.
The diagnostics page shown below appears if you click on one of the displayed ports. It
displays information on the available link power margin over time.
Figure 4-110 POF fiber-optic diagnostics
The vertical axis shows the available link power margin in dB. The measured values only
have the required accuracy to be able to show the existing link power margin correctly in the
range from 0 dB to 6 dB.
The horizontal axis shows the time since the IE switch started up relative to the current time
of day and the current date. Date and time information are adopted from the PC on which the
Web browser in use is running.
The diagram itself is divided into the following areas:
● White
There is an adequate link power margin for problem-free operation. When the X-200 IE
switch is installed, the link power margin should be in this range.
SCALANCE X-300 / X-400
Configuration Manual, 10/2014, C79000-G8976-C187-22
Configuration using Web Based Management and Command Line Interface
4.5 The Switch menu
249