Table of Contents
Advertisement
Technical data
8.6 Attenuators
8.5.2
STP991-1LD
Properties
Transmission mode
Transmission rate
Transmission medium
Light source
Wavelength
Cable length (max.) *
Transmitter output (optical)
Receiver input
*
Depending on the cable used, you can find additional information in the "Industrial Ethernet / PROFINET
)
Passive network components" System Manual, see also section "Introduction", paragraph "Additional
documentation".
8.6
Attenuators
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
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.
48
100Base-LX complying with IEEE 802.3
100 Mbps (Fast Ethernet)
Single mode fiber-optic cable
Class1-LASER "Eye safe"
1310 nm
26 km
)
Minimum
Maximum
Sensitivity min.
Input power max.
Attenuator
6 dB ... 12 dB
12 dB ... 20 dB
16 dB ... 24 dB
-15 dBm
-8 dBm
-28 dBm
-8 dBm
Transceiver SFP/SFP+/SCP/STP
Operating Instructions, 10/2023, A5E02630804-18
Advertisement
Table of Contents
