Siemens SIMATIC NET Operating Instructions Manual page 24

Description of the device
3.5 Installation guide
Bypass mode
In bypass mode, the network interfaces of the bypass relay (P1 and P2) are connected
together.
The end device 1 and network component 2 are connected via a bypass relay in normal
mode and a bypass relay in bypass mode.
If a network component is connected to an end device via two bypass relays with TAP
function, the attenuation depends on the direction. The attenuation in the send and receive
direction is different.
On connections via a bypass relay without TAP function, the attenuation in the send and
receive direction is the same.
Variant
SCALANCE
XC100-4OBR
(single mode)
24
TAP function Connection
Without TAP function End device 1 → network component 2
Network component 2 → end device 1
With TAP function End device 1 → network component 2
Network component 2 → end device 1
Operating Instructions, 10/2013, C79000-G8976-C297-02
Attenuation
at 0 °C to 60 °C
2.0 dB
4.9 dB
9.4 dB
SCALANCE XC100-4OBR