Allied-telesis AT-MR820TR Uživatelský manuál stáhnout pdf (Strana 57)

AT-MR420TR and AT-MR820TR Installation Guide

5 - 4 - 3 Rule

In addition to the requirements outlined in Chapter 3, Table 2, follow

the “5-4-3 rule” to ensure that your configuration does not exceed the

maximum 10Base-T data transmission path (the longest path through

any given network).

The 5-4-3 rule describes the maximum path between any two devices

or nodes (PCs or other stations) on the network. There can be:

❑ Up to five segments in series

❑ Up to four repeaters or multiport hubs

❑ Up to three populated segments (that is, segments attached to

two or more PCs)*

* The remaining two segments are unpopulated; these are known as

inter-repeater links or IRLs. This distinction between populated and

unpopulated segments is significant for coax networks only.

Note

This rule is completely consistent with the IEEE 802.3

speciﬁcation, and is meant only to summarize the

conﬁguration speciﬁcation.

MRx20TR(STP/UTP)_BookA Page 35 Thursday, April 3, 1997 5:24 PM

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Allied-telesis AT-MR820TR Uživatelský manuál Strana 57