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2 - 4 ONline Ethernet 10BASE-T Module User’s Guide
4 Certain LAN devices
on the network shrink
the maximum Fiber
Ethernet network
diameter to less than
4200 meters.
Many LAN products delay the signal
that goes through them. This is
known as equivalent distance. Every
microsecond delay reduces the
maximum link distance. In fact,
every microsecond delay shrinks the
network diameter by approximately
200 meters of fiber cable. Table 2-2
lists the Equivalent Distances for
other 3Com products.
5 Assume that one
meter of coaxial or
twisted pair is equal to
one meter of fiber
cable.
This is a conservative rule of thumb.
For example, the actual equivalence
is about 1.1 meters of coaxial for
every meter of fiber. For simplicity,
assume one meter.
Table 2-1. Seven Basic Network Rules (Continued)
Rule Definition Recommendations/Notes