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CSX200 Installation Guide 3-1
3
10BASE-T LAN Requirements
This chapter contains general networking guidelines for setting up a 10BASE-T Local Area
Network using ports 1 through 12 on the CSX200. Review the requirements and specifications
outlined in this chapter before attempting to install the CSX200.
Network Requirements
Take care in planning and preparing the cabling and connections for your network. The quality of
the connections, the length of cables, and other conditions of the installation play critical roles in
determining the reliability of your network.
10BASE-T Twisted Pair Network
When connecting a 10BASE-T twisted pair segment to any of the CSX200 ports (Interfaces 1
through 12), ensure the network meets the following requirements:
Length — The IEEE 802.3 standard for 10BASE-T requires that 10BASE-T devices transmit
over a 100 meter (328 foot) link on 22–24 AWG Unshielded Twisted Pair (UTP) wire. However,
cable quality largely determines maximum link length. Lengths of up to 200 meters may be
achieved if high quality, low attenuation cable is used. Cable delay limits the maximum link length
to 200 meters.
Impedance — Cabletron Systems 10BASE-T twisted pair products use twisted pair cable with
75 to 165 ohms impedance. UTP cable typically has an impedance from 85 to 110 ohms. Shielded
twisted pair cable, such as IBM Type 1 cable with an impedance of 150 ohms can also be used.
NOTE
Losses introduced by connections at punch-down blocks and other equipment reduce
total segment length. For each connector or patch panel in the link, subtract 12 meters
from the total length of the cable.