Siemens SCALANCE MM900 Series Compact Operating Instructions page 49

Media module
MM992-2VD (with VD)
The VD mode (Variable Distance) is turned off.
1)
The VD mode (Variable Distance) is turned on.
2)
Table 7-11
Media module
MM992-2CUC
MM992-2CUC (C)
MM992-2CU
MM992-2M12 (C)
MM992-2VD (without
VD)
The VD mode (Variable Distance) is turned off.
1)
If the VD mode is turned on, the speed is reduced to 100 Mbps. For permitted cable lengths, see table
2)
Fast Ethernet.
Fiber-optic cables
Table 7-12 Permitted cable lengths (fiber-optic cable - Fast Ethernet)
Media module Fiber-optic cable type
MM991-2 50/125 µm
(BFOC) multimode fiber
62.5/125 µm multi‐
mode fiber
SCALANCE MM900
Compact Operating Instructions, 11/2019, A5E02630805-16
Cable
IE FC TP standard cable GP 4X2 (24
2)
AWG) with IE FC RJ-45 plug 4x2
IE FC TP standard cable GP 2x2
with IE FC RJ-45 plug 2x2
IE FC TP standard cable GP 2x2
with IE FC RJ-45 plug 2x2
PROFIBUS FC standard cable GP
with IE FC RJ-45 plug 4x2
PROFIBUS FC standard cable GP
with IE FC RJ-45 plug 4x2
Permitted cable lengths (copper cable - gigabit Ethernet)
Cable
IE FC standard cable, 4×2, 24 AWG
IE FC flexible cable, 4×2, 24 AWG
with IE FC RJ-45 Plug 180,
4x2
IE FC standard cable, 4×2, 22 AWG with
1) 2)
IE FC Outlet RJ-45
+ 10 m TP cord
IE FC flexible cable, 4×2, 22 AWG with IE
FC Outlet RJ-45
+ 10 m TP cord
Max. permitted
cable length
5 km
5 km
Attenuation
≤1 dB/km at 1300 nm;1200 MHz*km; maximum insertion loss
0.5 dB; 9 dB max. permitted FO cable attenuation at 3 dB link
power margin
≤1 dB/km at 1300 nm; 1200 MHz*km; maximum insertion loss
0.5 dB; 9 dB max. permitted FO cable attenuation at 3 dB link
power margin
Technical data
7.3 Cable lengths
Permitted cable length
0 to 500 m at 100 Mbps
0 to 300 m at 100 Mbps.
300 to 500 m at 10 Mbps
100 to 1000 m at 10 Mbps
0 to 100 m at 100 Mbps.
Permitted cable length
0 to 90 m
0 to 60 m
+ 10 m TP cord
0 to 90 m
+ 10 m TP cord
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