Cabletron Systems CSX200 manual 10BASE-T LAN Requirements, Network Requirements

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.

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.

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.

CSX200 Installation Guide 3-1