3Com 5124M-TPCL manual Seven Basic Network Rules, Rule Definition Recommendations/Notes

For more hardware-specific information on the 24-Port Module, refer to Appendix A.

Table 2-1. Seven Basic Network Rules

Rule	Definition	Recommendations/Notes
1	If possible, use	Use 62.5 micron cable to conform
	10BASE-FB as the	with the IEEE 10BASE-F and
	backbone medium.	upcoming ANSI FDDI standards.
		Use ST-type connectors.
2	Wire the backbone in	Make sure to lay extra fiber
	a star topology to	cables. The extra cost is small and
	isolate faults.	you will find you need them as
		your network grows.
		The star topology conforms to
		FDDI wiring as well -- just make
		sure to run at least two fiber
		strands to every backbone
		connection.
3	The maximum Fiber	The 4200 meters is the maximum
	Ethernet network	distance between any two
	diameter is 4200	transceivers on the network.
	meters of fiber cable.
		The 4200 meters does not include
		the transceiver cable (that is, drop
		or patch cable) that connects a
		device with an external
		transceiver. Transceiver cables
		can extend up to 50 meters. Thus,
		total network diameter can be as
		much as 4300 meters (4200 m + 2
		* 50 m) between any two nodes.

Designing and Expanding the Network 2 - 3