Rockwell-automation Ethernet Design Considerations Reference Manual Manual do Utilizador descarregar pdf (Página 26)

26 Rockwell Automation Publication ENET-RM002C-EN-P - May 2013

Chapter 2 Ethernet Infrastructure Components

Media Converters

Media converters let you mix fiber and copper (twisted-pair) cables in the same

system.

Use a switch to mix media:

• Physical layer devices offer no buffering or advanced diagnostic features.

• Physical layer devices are easily overrun by an EtherNet/IP system (no

buffering = lost data).

• Layer 2 devices have buffering, QoS, and other management features.

Bridges

A bridge is a device that isolates traffic between segments by selectively

forwarding frames to their proper destination. A bridge is transparent to the

network and protocol independent. More advanced devices that perform the

same bridging function are commonly used instead of a bridge.

Fiber Link

Ethernet

Token Ring

Bridge

Ethernet Ethernet

Access Point

Work Group Bridge

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Rockwell-automation Ethernet Design Considerations Reference Manual Manual do Utilizador Página 26