Siemens SCALANCE X-300 Series Operating Instructions Manual page 209

Media module Fiber-optic cable type
MM991-2P 980/1000
(SC RJ) plastic optical fiber
200/230
polymer cladded fiber
Table 8-107 Permitted cable lengths (fiber-optic cable - gigabit Ethernet)
Media module Fiber-optic cable type Max. permitted
MM992-2 (SC) 62.5/125 µm
multimode fiber
MM992-2 (C)
(SC)
50/125 µm
multimode fiber
MM992-2LD 9/125 µm
(SC) single mode fiber
MM992-2LH 9/125 µm
(SC) single mode fiber
MM992-2LH+ 9/125 µm
(SC) single mode fiber
MM992-2ELH 9/125 µm
(SC) single mode fiber
Copper / fiber-optic cables
Table 8-108 Permitted cable lengths (copper cable/fiber-optic cable) for the SFP media module
Media module
MM992-2SFP
You will find further information in the compact operating instructions "Transceiver SFP/SFP+".
*)
Attenuators
Transceivers of the types LH, LH+, ELH and ELH200 are designed for long distances and
therefore send more power than they can receive.
If you establish a connection between such transceivers with a short cable length, use
attenuators. Attenuators increase the attenuation and therefore protect the receiving diode.
Select the attenuation so that the transmit power (transmitter output) behind the attenuator is
lower than the maximum received power (input power):
Transmitter output max. [dBm] - attenuator [dB] < input power max. [dBm]
SCALANCE X-300
Operating Instructions, 11/2019, A5E01113043-24
Max. permitted
cable length
50 m
100 m
cable length
350 m
750 m
10 km
40 km
70 km
120 km
Max. permitted cable length
Depending on the SFP transceiver used.
*)
8.9 MM900 technical specifications
Attenuation
9 dB max. permitted FO cable attenuation with 3 dB link power
margin
6 dB max. permitted FO cable attenuation with 3 dB link power
margin
Attenuation
≤3.1 dB/km at 850 nm; 1200 MHz×km; maximum insertion loss
0.5 dB; 4.5 dB max. permitted FO cable attenuation at 3 dB link
power margin
≤2.5 dB/km at 850 nm; 1200 MHz×km; maximum insertion loss
0.5 dB; 4.5 dB max. permitted FO cable attenuation at 3 dB link
power margin
≤0.5 dB/km at 1310 nm; maximum insertion loss 0.5 dB; 6 dB
max. permitted FO cable attenuation at 3 dB link power margin
≤0.4 dB/km at 1550 nm; maximum insertion loss 0.5 dB; 18 dB
max. permitted FO cable attenuation at 2 dB link power mar‐
gin, minimum cable attenuation 3 dB
≤0.28 dB/km at 1550 nm; maximum insertion loss 0.5 dB;
21 dB max. permitted FO cable attenuation at 2 dB link power
margin, minimum cable attenuation 8 dB
≤0.225 dB/km at 1550 nm; maximum insertion loss 0.5 dB;
27 dB max. permitted FO cable attenuation at 2 dB link power
margin, minimum cable attenuation 8 dB
Technical specifications
209