Siemens X-400 User Manual
Page 52
Media Modules, Covers, Dummy Cover
Operating Instructions for SCALANCE X-400 Industrial Ethernet Switches
52
C79000-G8976-C186-03
4.1.2 Fast Ethernet Media Module MM491-2LD (100Base-FX)
The fast Ethernet media module MM491-2LD 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 is possible.
Properties
The fast Ethernet media module provides two ports for connecting the single mode
FOC. The signal is transmitted by laser diode with a wavelength of 1310 nm. The
maximum cable length is 26 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, only a fixed transmission rate and full duplex mode are
possible. 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 always displayed.
● In display mode D, you can see whether or not the port is monitored.
F
L 1
L 2
R M
S T B Y
D M 1
D M 2
P 1
P 2
P 1
P 2
P 1
P 2
P 1
P 2
P 3
P 4
P 1
P 2
P 3
P 4
P 1
P 2
P 3
P 4
I N 1 / I N 5
I N 2 / I N 6
I N 3 / I N 7
I N 4 / I N 8
2
3
4
1 1
8
9
1 0
7
6
5
Figure 4-3
Slots of the MM491-2LD media module