Linksys EF4124, EF4116 manual Appendix B About Fast Ethernet, Reading a Fiber Module’s LED Display

Instant EtherFast® Series

The fiber module does not autosense, so you must set it to run at either full or half duplex. Prior to installing the fiber module into the expansion port, use the jumpers on the card as shown in Figure A-1.

Figure 2-2

Changing connectors must be done professionally with the proper tools. If this is your first time working with fiber, consult a networking professional who is familiar with fiber.

Reading a Fiber Module’s LED Display

A Fiber Module’s LED Display has two LEDs: the Link/Activity (Link/Act) LED and the Full Duplex/Half Duplex (FDX) LED. See the chart below to find out what the status of each LED denotes.

Front Panel LED Displays

	LEDs		Network Status
LEDs	Color	Status
Link/Act	Green	Solid light	Connection Established
		Blinkinglight	Transmitting/Receiving
FDX	Yellow	Solid light	Full duplex transfer mode
		No light	Half duplex transfer mode

EtherFast® 16-Port and 24-Port 10/100 Ethernet Switches

Appendix B: About Fast Ethernet

History of Fast Ethernet

Standard Ethernet has been the most popular networking technology during this past decade, with a maximum data throughput of 10Mbps. But this Ethernet speed standard has fallen out of favor as today’s massive graphics, multimedia, and other data-intensive applications have magnified the problem of lagging network speed.

Fast Ethernet now dominates as the most viable and economical solution to resolve the problem of network speed over all other market alternatives. Capable of sending and receiving data at 100 Mbps, its bandwidth more than accommodates even the most intensive real-time applications.

Also known as 100BaseTX, Fast Ethernet supports high speed signaling and gives users an efficient and affordable solution for upgrading their present net- work to the upcoming standard speed of 100Mbps. 100BaseTX data packet lengths and formats are transmitted over two pairs of UTP Category 5 cabling, just like the 10BaseT system. It also uses identical data error control and man- agement information as 10BaseT transmission.

Because Fast Ethernet is based on similar technology as standard Ethernet, the issue of migrating from 10Mbps to the higher Fast Ethernet speed of 100Mbps requires virtually no effort with the right piece of equipment. All it takes is an Ethernet Switch to coordinate your network hardware, and you’re ready to run a top-notch system.

Switches versus Hubs

An Ethernet Switch boosts your network performance several times over, con- serving your time, money and resources. The scalability of an Ethernet Switch, its full duplex data transfer and dedicated bandwidth, all contribute to maxi- mizing efficiency in your Fast Ethernet network.

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