Cabletron Systems HubSTACK SEHI-34 User Manual

Also see for HubSTACK SEHI-34: Addendum

Contents

INSTALLATION REQUIREMENTS/SPECIFICATIONSPage 2-3DelayThe maximum propagation delay of a 10BASE-T link segment mustnot exceed 1000 nsec. This 1000 nsec. maximum delay limits themaximum link segment length to no greater than 200 meters.CrosstalkCrosstalk is caused by signal coupling between the different cablepairs contained within a multi-pair cable bundle. 10BASE-Ttransceivers are designed so that the user does not need to beconcerned about cable crosstalk, provided the cable meets all otherrequirements.NoiseNoise can be caused by either crosstalk or externally inducedimpulses. Impulse noise may cause data errors if the impulses occur atvery specific times during data transmission. Generally, the user neednot be concerned about noise. If noise-related data errors aresuspected, it may be necessary to either reroute the cable or eliminatethe source of the impulse noise.TemperatureMulti-pair PVC 24 AWG telephone cables typically have anattenuation of approximately 8 to 10 dB/100m at 20° C (78° F). Theattenuation of PVC insulated cable varies significantly withtemperature. At temperatures greater than 40° C (104 ° F), westrongly recommend that you use plenum-rated cables to ensure thatcable attenuation remains within specification.