3Com 3C8S5007 - SuperStack II PathBuilder S500..., User Manual

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LAN Connector and Cables 87
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 15:
■
UTP (running TX or T4) — Maximum cable span length is
≤
100 m.
■
Fiber (running FX) — Maximum cable span length is
≤
412 m.
Figure 25 shows examples of collision domain diameters.
Figure 25 Collision Domain Diameter Examples
To determine a valid collision domain diameter, follow these steps:
1 Determine which interfaces will be used: TX, FX, or T4.
2 Add up the combined length of all cabling to be used.
3 Determine which class of repeaters, if any, are used in the collision
domain diameter.
4 Determine the maximum cable length by referring to Table 16, which
contains cabling and repeater guidelines for three scenarios shown in
Figure 26, Figure 27, and Figure 28.
Collision domain
diameter 1
Collision domain
diameter 2
Collision domain
diameter 3
PathBuilder Switch
Fast Ethernet Repeater
Fast Ethernet Repeater
End Stations
DTE device
DTE device
DTE device
DTE
device
PathBuilder Switch