Fast Ethernet Media Module Mm491-2 (100Base-Fx) - Siemens SCALANCE X-400 Operating Instructions Manual

4.1.1

Fast Ethernet Media Module MM491-2 (100Base-FX)

The fast Ethernet media module MM491-2 can be used optionally in slots 6 and 7
of the basic device and when using the media module extender EM496-4, it can
also be used in slots 12 through 15. Mixed operation with the fast Ethernet media
module MM491-2LD is possible.
Properties
The fast Ethernet media module provides two ports for connecting the multimode
FOC. The signal is transmitted by LED with a wavelength of 1310 nm. The maxi-
mum cable length is 3 km.
Connector
The connectors are 2x2 BFOC sockets.
LED Display of the Fast Ethernet Media Module
The LED displays of the module are the same as the LEDs of the basic device.
With optical transmission, a fixed transmission rate of 100 Mbps and full duplex
mode is set. The display in display modes B and C is analogous.
● In display mode A, the current connection status is displayed.
● In display mode B, the fixed transmission rate is displayed.
● In display mode C, the full duplex mode is displayed.
● In display mode D, you can see whether or not the port is monitored.
Figure 4-2
Operating Instructions for SCALANCE X-400 Industrial Ethernet Switches
C79000-G8976-C186-03
Slots of the MM491-2 media module
Media Modules, Covers, Dummy Cover
51