3Com 5102M-FBP, 5104M-FB1, 510M-FBP Fiber Equivalent Distances Between Transceivers

In this example, the path between transceivers attached to Concentrators A and G has the greatest fiber equivalent distance (4240 meters), even though the link distance is less than the A to H path (3100 meters versus 3200 meters). Because 4240 meters exceeds the 4200 meter maximum, this configuration is illegal and results in improper network operation.

Because it is not always obvious which path between transceivers has the highest fiber equivalent distance, use Table 2-8 to help you determine the equivalent distances.

Table 2-8. Fiber Equivalent Distances Between Transceivers

	Total Fiber		Equivalent	Total
	Link	Number of
			Fiber Distance	Fiber
	Distance	Concentrators
Path			of	Equivalent
	Between	Between
			Concentrators	Distance
	Transceivers	Transceivers
			(meters)	(meters)
	(meters)
A - D	2700	5	950	3650
A - H	3200	5	950	4150
A - G	3100	6	1140	4240
D - H	1700	3	570	2270
D - G	1600	4	760	2360
G - H	2100	4	760	2860

Designing and Expanding the Network 2 - 21