AT-FS238a/x and AT-FS238b/x Series Installation Guide

Twisted Pair Port

The AT-FS238a/x and AT-FS238b/x Series Bridging Converters have one 10Base-T/100Base-TX twisted pair port. The twisted pair port features a RJ-45 connector.

Port Speed

The twisted pair port is compliant with the 10Base-T and 100Base-TX standards and is capable of either 10 Mbps or 100 Mbps operation. You can set the port speed manually or, since the port is IEEE 802.3u auto-negotiation compliant, you can allow the bridging converter to set the port speed automatically. With auto-negotiation, the speed of the port is set automatically by the bridging converter after it determines the speed of the end-node connected to the port. Auto-negotiation is designed to ensure that the port on the bridging converter and the end-node are operating at the same speed and that they are communicating at the highest possible common speed of the devices.

Duplex Mode

Duplex mode refers to how an end-node receives and transmits data. If an end-node can receive or transmit data, but not both simultaneously, the end- node is operating in what is referred to as half-duplex mode. If an end-node can both receive and transmit data simultaneously, the end-node is said to be operating in full-duplex mode. Naturally, an end-node capable of operating in full-duplex can handle data much faster than an end-node that can only operate in half-duplex mode.

The twisted pair ports on the AT-FS238a/x and AT-FS238b/x Series Bridging Converter can operate in either half-or full-duplex mode. They are IEEE 802.3u-compliant and use Auto-Negotiation to set the duplex mode setting for you automatically.

For Auto-Negotiation to operate properly on a bridging converter, the end- nodes connected to the converter should also use Auto-Negotiation. If an end- node does not have this feature and has a fixed duplex mode of full-duplex, the result will be a duplex mode mismatch between the end-node and a converter port. A port on the bridging converter connected to an end-node with a fixed duplex mode of full-duplex will operate at only half-duplex. This results in the end node using full-duplex and the switch port using half-duplex. This can produce network performance problems. Should you encounter this situation, you must configure the port on the end-node to use Auto-Negotiation or, if it lacks that feature, to half-duplex.

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Allied Telesis AT-FS238a/1, AT-FS238b/1, AT-FS238b/2, AT-FS238a/2 manual Twisted Pair Port, Port Speed, Duplex Mode

AT-FS238a/1, AT-FS238a/2, AT-FS238b/1, AT-FS238b/2 specifications

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