Siemens X-400 - Manual (Page 62)

Extender Modules
Operating Instructions for SCALANCE X-400 Industrial Ethernet Switches
62 C79000-G8976-C186-03
Figure 5-2 Twisted pair extender EM495-8
Covers
For slots 12 and 13 of the twisted pair extenders EM495-8, you can use the cover
that can be used on slots 9 through 11 on the basic device. Two CV490 4x100
covers are supplied with the twisted pair extender.