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2 - 14 ONline Ethernet 24-Port 10BASE-T Module Installation Guide
Using Patch Panels
Patch panels weaken signals that pass through them, thereby reducing
achievable link distances. 3Com assumes the use of one patch panel in the
100 meter link distance calculations specified in this installation guide. Each
additional patch panel in the link reduces the 100 meter link distance by
approximately 10 meters.
In Figure 2-4:
❑ If two patch panels were used between the top right PC and the top
right concentrator, the link distance of 100 meters would have to be
shortened to 90 meters.
❑ The link distance would have to be shortened to 90 meters because
the maximum allowable link distance on 24-gauge wire using
10BASE-T signaling with two intervening patch panels is 100 meters
minus approximately 10 meters.
❑ A patch panel installed between the bottom right PC and the bottom
left concentrator would not affect the link because it is only 20
meters away.
Establishing Fault-Tolerant Configurations
You can establish fault tolerance for any port on the 24-Port Module, for
selected portions of the network backbone, or for the entire network
backbone.
This section describes:
❑ Setting Port Redundancy
❑ Setting Backbone Redundancy