Siemens SCALANCE X-400 Operating Instructions Manual page 14

Introduction to Industrial Ethernet Switches
Electrical Ring
A redundant electrical ring with redundancy manager can be set up without media
modules since the basic device provides two RJ-45 jacks on slot 5 that allow con-
nection of electrical (twisted pair) connections (10, 100, 1000 Mbps). The factory
setting defines the two ports on slot 5 as ring ports.
Optical Ring
An optical ring with redundancy manager is only possible with media modules.
Which slots or ports should be used, depends on the selected transmission rate.
The ports that can be used as ring ports are located on the media modules that
can be used in slots 5, 6 and 7. As an alternative to optical gigabit transmission,
the two ports on slot 6 or the first ports of slot 6 and 7 can be configured as ring
ports for an optical fast Ethernet connection.
● Slot 5
equipped with MM492-2 or with MM492-2LD allows the ring to be operated as
an optical gigabit ring with redundancy manager.
● Slot 6 / slot 6 and 7 (in each case only port 1)
equipped with MM491-2 or with MM491-2LD allows operation of an optical fast
Ethernet ring with redundancy manager.
14
Operating Instructions for SCALANCE X-400 Industrial Ethernet Switches
C79000-G8976-C186-03