3Com 5104M-FB1, 5102M-FBP, 510M-FBP installation and operation guide Is actually equal to 1.1 meters

Table 2-1.	Basic Network Rules (Continued)
Rule		Definition	Recommendations/Notes
5		Assume that one meter	This is a conservative
		of coaxial or twisted	equivalence. One meter of fiber
		pair cable is equal to	is actually equal to 1.1 meters of
		one meter of fiber	coaxial. For simplicity, assume
		cable.	one meter.
6		Verify that the	In general, on 62.5 cable, use
		10BASE-FB link	up to 4000 meters
		distances do not	point-to-point using the
		exceed the limits	10BASE-FB Modules. If you
		imposed by the optical	have poor quality cable or
		power budget.	numberous patch panels, you
			may have to sacrifice some
			distance.
			Some older Ethernet fiber optic
			products are less powerful than
			ONline 10BASE-FB Module
			optics. When connecting to
			these products, remember that
			they determine the maximum
			point-to-point distance.
7		When in doubt, use a	If you are not certain you have
		bridge.	exceeded acceptable network
			distances, use a bridge to
			extend the network.

2 - 4 ONline Ethernet 10BASE-FB Module Installation and Operation Guide