Cabletron Systems F3 user manual Lanview LEDs Optical Link OK LNK LED, Collision CLN LED

USING LANVIEW

Figure 4-2 shows the location of the LANVIEW LEDs on the FOT-F3. This is followed by a description of how to interpret the indications of these LANVIEW LEDs.

	SQE
P	S	X	R	C	L
W	Q	M	C	L	N
R	E	T	V	N	K
					TX
					RX
					0461-11

Figure 4-2 LANVIEW LEDs

Optical Link OK (LNK) LED

When on, 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 on 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 easy viewing.

FOT-F3 USER’S MANUAL 4-5