TESTING AND TROUBLESHOOTING
4.2 USING LANVIEW
The FOT-F3 Fiber Optic Transceiver uses Cabletron Systems’ LANVIEW, a built-in visual diagnostic and status monitoring system. LANVIEW LEDs are more effective than a network monitor because a network troubleshooter can quickly scan the LEDs to diagnose network problems and to determine which node or segment is faulty.
The following discusses the function and purpose of each LANVIEW LED on the FOT-F3 Fiber Optic Transceiver. See Figure 4-2.
Optical Link OK (LNK) LED
When lit, this green LED indicates that a link has been established between the receive circuitry of the FOT-F3 and the transmit circuitry of the fiber optic device at the other end of the fiber optic link segment. This LED remains lit as long as the link is maintained.
To ensure that a link is maintained, the transceiver generates a 1 MHz idle signal when it is not transmitting data.
Collision (CLN) LED
This red LED flashes to indicate that the FOT-F3 is detecting a collision condition. The frequency of flashes increases as the network activity increases since more collisions are likely to occur. The flash of the LED is pulse-stretched for viewing effect.
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