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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
LH
LH+
ELH, ELH200
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.
GI-PCF
For segment lengths longer than 100 m, you can use GI-PCF cables. Note the information of
the manufacturer.
5.4
Other properties
Table 5- 15
Device version (power supply)
MM992-2CUC,
MM992-2CUC (C),
MM992-2CU,
MM992-2M12 (C)
MM991-2P
MM992-2VD
MM991-2,
MM991-2 (SC)
MM991-2FM
MM992-2 (C)
MM991-2LD,
MM991-2LD (SC),
MM992-2LD
MM991-2LH+,
MM992-2LH.
MM992-2LH+
SCALANCE MM900
Compact Operating Instructions, 05/2016, A5E02630805-12
Mean time between failure (MTBF)
Attenuator
6 dB ... 12 dB
12 dB ... 20 dB
16 dB ... 24 dB
MTBF
1)
> 250 years
> 230 years
> 200 years
> 140 years
> 135 years
> 115 years
> 105 years
Technical data
5.4 Other properties
41
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