Functionality And Properties Of A Scalance X-300/X-400 - Siemens SCALANCE X-300 Configuration Manual

Network management for industrial networks

2.2 Functionality and properties of a SCALANCE X-300/X-400

2.2 Functionality and properties of a SCALANCE X-300/X-400
Integration of existing subnets with 10 Mbps and 100 Mbps
An IE switch automatically detects the following at its twisted pair ports:
● Send and receive wire pairs (autocrossover)
● Data rate (10 Mbps or 100 Mbps)
● Mode (full or half duplex)
This allows you to integrate subnets easily with IE switches over twisted pair.
Note
Even when using straight cables, an illegal loop can occur in the Ethernet network, for
example by connecting two ports to an IE switch. Such a loop can lead to network overload
and network failures.
Note
If an IE switch is connected to a partner device that does not operate in autonegotiation
mode, the port must be set permanently to the parameters of the partner.
If both ends of the connection are not set manually, the duplex mode will not be detected.
The half duplex mode is used and results in poorer performance and collisions.
Gigabit Ethernet ports
These ports are particularly suitable for a high-performance connection between switches
and have the following properties:
● Automatic detection of the send and receive cable pairs (autocrossover)
● Data rates 10 Mbps, 100 Mbps, or 1000 Mbps
● Full duplex
Note
For data transmission at 1 Gbps, at least a Cat 5e twisted-pair cable with 4 x 2 wires is
necessary. With a four-wire cable (2 x 2 wires), a maximum data transmission rate of 100
Mbps is possible.
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Configuration Manual, 10/2014, C79000-G8976-C187-22
SCALANCE X-300 / X-400