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Industrial Ethernet Guide - Limitations Of Ethernet

Posted by Wilfried Voss on

A Comprehensible Guide to Industrial Ethernet by Wilfried Voss

The following is part of  A Comprehensible Guide to Industrial Ethernet by Wilfried Voss.

There are, in fact, only few limitations to Ethernet as a standard networking technology, and those that exist can be rectified easily.

There are practical limits to the size (physical network length, number of devices) of a complete Ethernet network that shares a single cable.

The primary concern is the physical length, meaning there is a limitation to the maximum distance between two nodes, called the Network Diameter. For instance, the Ethernet TCP/IP communication according to IEEE 802.3 supports 100 Mbit/sec over distances of 100 meters (~300 feet) between two devices (100BaseTx).

While electrical signals propagate very quickly through the cable, they weaken as they travel, and electrical interferences from other devices (e.g. motors, electrical valves) can diminish the signal quality. Thus, to assure proper communication, a network cable must be short enough to guarantee that nodes at opposite ends of the network can receive signals without distortion and with minimal delay.

Also, there are limits to the number of devices that can coexist in a single-cable network, since CSMA/CD allows only a single device to transmit at a given time. When too many devices are attached to one shared segment, the contention for the medium will increase, and devices may have to wait an intolerably long time before having a chance to transmit.

Note: In the worst-case scenario, when message collisions occur continuously, nodes (i.e., Ethernet network adapters) will dump the message frame and will not attempt a re-transmission.

However, the market provides many network devices to alleviate the issues at hand.

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