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External power adapter (depending on the model) . For use on a desktop or in an AT-MCR12 chassis Overview Status LEDs Table 2 defines the LEDs for the bridging converters. Table 2 Status LEDs LED Color Description PWR Green Power is applied to the unit. AUTO NEG Green OFF Auto-negotiation on the twisted pair port is enabled. Auto-negotiation on the twisted pair port is disabled. 100M Green OFF The twisted pair port is operating at 100 Mbps. The twisted pair port is operating at 10 Mbps. LNK Green Blinking A valid link has been established on the port. Data is being received or transmitted on the port. FD/COL Green OFF Blinking The bridging converter is operating in full-duplex mode. The bridging converter is operating in half-duplex mode. A collision has been detected on the port. Mode Status ML Green MissingLink is enabled. SML Green Smart MissingLink is enabled. LT Green Link Test is enabled. 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. Overview Auto MDI/MDI-X An RJ-45 twisted pair port on a 10 Mbps or 100 Mbps Ethernet network device can have one of two possible wiring configurations: MDI or MDI-X. The RJ-45 port on a PC, router, or bridge is typically wired as MDI, while the twisted pair port on a bridging converter or hub is usually MDI-X. To connect two 10 Mbps or 100 Mbps network devices together that have dissimilar port wiring configurations, such as MDI to MDI-X, you would usually use a straight-through twisted pair cable. To connect two network devices that have the same wiring configuration, such as MDI to MDI, you would usually use a crossover cable. The AT-FS238a/x and AT-FS238b/x Series Bridging Converters feature automatic MDI/MDI-X. The RJ-45 port automatically determines the configuration of the port on the device to which it is connected and then configures itself appropriately. For example, if a port on a bridging converter is connected to a port on a bridge, which is typically wired as MDI, the port on the bridging converter automatically configures itself as MDI-X. This feature allows you to use either crossover cables or straight-through cable when connecting a device to the twisted pair port. Fiber Optic Port The AT-FS238a/x and AT-FS238b/x Series Bridging Converters have one 100Base-FX fiber optic port. The single-mode fiber optic port features a simplex SC connector. Port Speed The fiber optic port is compliant with the 100Base-FX standard and has a fixed operating speed of 100 Mbps. The end-node connected to the fiber optic port on the bridging converter must also be able to operate at 100 Mbps. The AT-FS238a/x and AT-FS238b/x Series Bridging Converters can send and receive on the two...

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