CSX200 Family User’s Guide 213 10BASE-T LAN RequirementsThis chapter contains general networking guidelines for setting up a 10BASE-T Local AreaNetwork using ports 1 through 12 on the CSX200. Review the requirements and specificationsoutlined in this chapter before attempting to install the CSX200.Network RequirementsTake care in planning and preparing the cabling and connections for your network. The quality ofthe connections, the length of cables, and other conditions of the installation play critical roles indetermining the reliability of your network.10BASE-T Twisted Pair NetworkWhen connecting a 10BASE-T twisted pair segment to any of the CSX200 ports (Interfaces 1through 12), ensure the network meets the following requirements:Length — The IEEE 802.3 standard for 10BASE-T requires that 10BASE-T devices transmitover 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 beachieved if high quality, low attenuation cable is used. Cable delay limits the maximum link lengthto 200 meters.Impedance — Cabletron Systems 10BASE-T twisted pair products use twisted pair cable with75 to 165 ohms impedance. UTP cable typically has an impedance from 85 to 110 ohms. Shieldedtwisted pair cable, such as IBM Type 1 cable with an impedance of 150 ohms may also be used.NOTELosses introduced by connections at punch-down blocks and other equipment reducetotal segment length. For each connector or patch panel in the link, subtract 12 metersfrom the total length of the cable.
