Installation Guide - Siemens SIMATIC NET Operating Instructions Manual

Description of the device

3.5 Installation guide

3.5 Installation guide
Calculating the cable length
The maximum cable length between a SCALANCE XC100-4OBR and a connected network
component depends on the optical budget of the transceiver and the attenuation of the
bypass relay.
To calculate the maximum cable length, you need to deduct the attenuation values from the
optical budget of the transceiver.
The available budget is shown based on the example of the SFP transceiver (see section
"On the product (Page 8)", subsection "Accessories").
Note
The wall sockets in the device are specified as having an attenuation value of 0.3 dB. This
value must be deducted from the budget for each plug-in connection.
To achieve a greater cable length, use transceivers with a higher optical budget, for example
transceivers with the designation LH instead of LD.
Transceiver
The SCALANCE XC100-4OBR is suitable for transceivers with the following properties:
● Multimode, 1300 nm, Fast Ethernet
● Single mode, 1310 nm and 1550 nm, Fast/Gigabit Ethernet
The SFP transceivers listed in the "Accessories" section have these properties. You can use
the SFP transceivers in IE switches with suitable slots.
You can also use IE switches in which the optical transceivers are already integrated.
Attenuation
The following factors influence the attenuation of the bypass relay:
● TAP function
Bypass relay with or without TAP function
● Mode
Normal or bypass mode
● Variant of the bypass relay
single mode or multimode
The following use cases show the possible installation of the SCALANCE XC100-4OBR and
the resulting attenuation values.
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Operating Instructions, 10/2013, C79000-G8976-C297-02
SCALANCE XC100-4OBR