3Com SuperStack II - Creating a Valid Network

LAN Connector and Cables 39
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 9:
■ UTP (running TX or T4) — Maximum cable span length is ≤100 m.
■ Fiber (running FX) — Maximum cable span length is ≤412 m.
Figure 10 shows examples of collision domain diameters.
Figure 10 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 10, which
contains cabling and repeater guidelines for three scenarios shown in
Figure 11, Figure 12, and Figure 13.
Collision domain
diameter 1
Collision domain
diameter 2
Collision domain
diameter 3
SuperStack II
NETBuilder
Fast Ethernet Repeater
Fast Ethernet Repeater
End Stations
DTE device
DTE device
DTE device
DTE
device
SuperStack II
NETBuilder
HWBook Page 39 Friday, June 19, 1998 3:42 PM