3Com NETBuilder SI, SuperStack II manual Shows examples of collision domain diameters

LAN Connector and Cables 167

To create a valid collision domain diameter, you must adhere to the following maximum cable span lengths along with the collision domain diameter guidelines in Table 22:

■UTP (running TX or T4) — Maximum cable span length is ≤100 m.

■Fiber (running FX) — Maximum cable span length is ≤412 m.

Figure 21 shows examples of collision domain diameters.

Figure 21 Collision Domain Diameter Examples

DTE device	Collision domain
	diameter 3

DTE device

Collision domain diameter 1

SuperStack II NETBuilder

Fast
Ethernet	Repeater
	End
	Stations

Fast
Ethernet	Repeater	DTE
Collision domain
		device
diameter 2

DTE device

SuperStack II

NETBuilder

To determine a valid collision domain diameter, follow these steps:

1Determine which interfaces will be used: TX, FX, or T4.

2Add up the combined length of all cabling to be used.

3Determine which class of repeaters, if any, are used in the collision domain diameter.

4Determine the maximum cable length by referring to Table 23, which contains cabling and repeater guidelines for three scenarios shown in Figure 22, Figure 23, and Figure 24.