Figure 3-2 Optical Ring, Example With Scalance X-400 As Redundancy Manager, X204-2 And A Extension For Optical Lines With Scalance X101-1Ld Media Converter; Figure 3-3 Electrical Ring, Example With Scalance X204Irt As Redundancy Manager, X208 And Conversion To A Optical Line With Scalance X101-1 Or X101-1Ld Media Converter - Siemens SCALANCE X101-1 Commissioning Manual