Siemens SCALANCE X308-2 User Manual

Technical specifications
8.9 MM900 technical specifications
SCALANCE X-300
Operating Instructions, 05/2016, A5E01113043-20
213
Media module
Fiber-optic cable
type
Max. permitted
cable length
Attenuation
MM992-2LD 9/125 µm
single mode fiber
10 km
≤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 mar-
gin
MM992-2LH 9/125 µm
single mode fiber
40 km ≤0.4 dB/km at 1550 nm; maximum insertion loss 0.5 dB;
18 dB max. permitted FO cable attenuation at 2 dB link pow-
er margin, minimum cable attenuation 3 dB
MM992-2LH+ 9/125 µm
single mode fiber
70 km ≤0.28 dB/km at 1550 nm; maximum insertion loss 0.5 dB;
21 dB max. permitted FO cable attenuation at 2 dB link pow-
er margin, minimum cable attenuation 8 dB
MM992-2ELH 9/125 µm
single mode fiber
120 km ≤0.225 dB/km at 1550 nm; maximum insertion loss 0.5 dB;
27 dB max. permitted FO cable attenuation at 2 dB link pow-
er margin, minimum cable attenuation 8 dB
Copper / fiber-optic cables
Table 8- 131 Permitted cable lengths (copper cable/fiber-optic cable) for the SFP media module
Media module
Max. permitted cable length
MM992-2SFP
*)
Depending on the SFP transceiver used.
*)
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]
Recommendation for the attenuation of the attenuator on a connection with the same
transceivers:
Transceiver type
Attenuator
LH
6 dB ... 12 dB
LH+
12 dB ... 20 dB
ELH, ELH200
16 dB ... 24 dB
If you have established a connection on a pluggable transceiver with a short cable length, it
is possible that the transmitter will be turned off. In this case, pull the transceiver and plug it
in again.

Siemens SCALANCE X308-2 Specifications

General

Brand	Siemens
Model	SCALANCE X308-2
Category	Switch
Language	English