Siemens Industrial Ethernet Switches SCALANCE X-200 - Manual (Page 225)

Configuration / diagnostics using remote mechanisms
6.3 Configuration using Web Based Management (WBM) and Command Line Interface (CLI)
SCALANCE X-200
Operating Instructions, 12/2011, A5E00349864-19
225
The link power margin indicates the attenuation on the connection between sender and
receiver that can be overcome. The higher the link power margin, the higher the attenuation
can be while maintaining a functioning link. If the link power margin sinks, the attenuation
has increased, for example due to aging or a defect. The longer the cable being used, the
lower the link power margin available.
The fiber-optic diagnostics screen appears if you click on one of the displayed ports. It
displays information on the available link power margin over time.
Figure 6-38 POF fiber-optic diagnostics
The vertical axis shows the available link power margin in dB.
The horizontal axis shows the time since the IE Switch X-200 started up.
The time from the startup of the IE Switch X-200 is displayed relative to the current time and
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 two areas:
White:
There is an adequate link power margin for problem-free operation. When the IE Switch X-
200 is installed, the link power margin should be in this range.