100Base-T Cabling Guidelines
This section describes 100Base-T cabling guidelines and some common configurations for Catalyst 2800 modules. The following cabling guidelines apply to a 100Base-T network:
The maximum length for an Unshielded Twisted Pair (UTP) cable segment is 100 meters.
Any cable segment longer than 100 meters must be fiber.
A 100Base-T repeater is equivalent to 95 meters of cable.
The maximum cable length between any two nodes on a repeated network is 305 meters.
To determine your cable budget, use the following formula:
400 – (R x 95) = Maximum cable length between any two nodes (in meters)
R represents the number of 100Base-T repeaters.
Table 3-2 lists the maximum cable length between two nodes in a 100Base-T network.
Table 3-2: Cabling Limits in a 100Base-T Network
Number of Repeaters Maximum Cable Length Between Two Nodes
0 400 meters 1 305 meters 2 210 meters
Note For switch-to-switch or switch-to-server (0 repeaters) and full duplex operation, the maximum cable length between any two nodes extends to two kilometers using fiber.