Cabletron Systems CyberSWITCH CSX400 Installation Manual

Also see for CyberSWITCH CSX400: Setup guide Configuration guide User guide User guide User guide

Contents

Chapter 3: Ethernet Cabling Requirements3-2CyberSWITCH CSX400 and CSX400-DC Installation Guide10BASE-T Twisted Pair NetworkWhen connecting a 10BASE-T segment to either of the CSX400 Ethernet interfaces (Twisted PairEthernet Port Interface Module [EPIM-T]), ensure that the network meets the followingrequirements:Length — The IEEE 802.3 10BASE-T standard requires that 10BASE-T devices transmit over a100 meter (328 foot) link using 22–24 AWG unshielded twisted pair wire. However, cable qualitylargely determines maximum link length. If you use high quality, low attenuation cable, you canachieve link lengths of up to 200 meters. Cable delay limits the maximum link length to 200meters.Insertion Loss — Between frequencies of 5.0 and 10.0 MHz, the maximum insertion loss mustnot exceed 11.5 dB. This includes the attenuation of the cables, connectors, patch panels, andreflection losses due to impedance mismatches in the link segment.Impedance — Cabletron Systems 10BASE-T products work on twisted pair cable with75-to-165 ohms impedance. Unshielded twisted pair cables typically have an impedance ofbetween 85 and 110 ohms. You can also use Shielded Twisted Pair cables, such as IBM Type 1cable, but this cable has an impedance of 150 ohms.Jitter — Intersymbol interference and reflections can cause jitter in the bit cell timing, resultingin data errors. 10BASE-T links must not generate more than 5.0 ns of jitter. Make sure the cablemeets 10BASE-T link impedance requirements to rule out jitter as a concern.Delay — The maximum propagation delay of a 10BASE-T link segment must not exceed1000 ns. This 1000 ns maximum delay limits the maximum link segment length to no greater than200 meters.Crosstalk — Signal coupling between different cable pairs within a multi-pair cable bundlecauses crosstalk. 10BASE-T transceiver design alleviates concerns about crosstalk, provided thecable meets all other requirements.Noise — Crosstalk, or externally induced impulses, can cause noise. Impulse noise may causedata errors if the impulses occur at very specific times during data transmission. Generally, noise isnot a concern. If you suspect noise-related data errors, you may need to reroute the cable oreliminate the source of the impulse noise.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.