Allied Telesis AT-MR420TR, Руководство по установке

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AT-MR420TR and AT-MR820TR Installation Guide
35
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