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Description of the device
3.1
Properties and functions
Purpose
With the SCALANCE TAP104 you can divert frames for diagnostics without a reaction in Ethernet
based networks.
Basic function
The SCALANCE TAP104 is a fully passive component in the network. When de-energized it
forwards all frames of a network connection transparently, even defective frames. The
SCALANCE TAP104 itself does not feed any data into the network.
To be able to monitor the frames of a network connection with a diagnostics device, the
SCALANCE TAP must be connected to a suitable power supply. The SCALANCE TAP then mirrors
a send direction to one of the diagnostics ports TAP1.1 and TAP1.2.
Diagnostics ports
All frames sent via pins 1 and 2 of the two network ports are mirrored to the diagnostics port
TAP1.1.
All frames sent via pins 3 and 6 of the two network ports are mirrored to the diagnostics port
TAP1.2.
The send directions are not permanently assigned to pins 1-2 and 3-6, but depend on the
following factors.
• Device type
– End device (Data Terminal Equipment)
– Connection device (Data Communication Equipment)
• Cabling
– Straight through cable (straight through)
– Crossover cable (cross over)
• "MDI/MDI-X Autocrossover" function
With the "MDI/MDI-X autocrossover" function, the send and receive contacts of an Ethernet
port are assigned automatically. This means that it does not matter whether the port is
connected using a crossover or straight through cable.
– Cannot be configured, i.e. always active
– Configurable
SCALANCE TAP
Operating Instructions, 06/2022, C79000-G8976-C447-03
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