Cabletron Systems MRX Installation Manual

Cabletron Systems MRX Installation Manual Manual pdf 13 page image

Page 2-2REQUIREMENTS/SPECIFICATIONS• If a shelving unit is to be used, it must be able to support30 pounds of static weight.• The temperature for the selected location must be maintainedbetween 5° and 50° C, and less than 10° C per hour temperaturechange.2.3 NETWORK GUIDELINESThe following network design guidelines must be followed whenconnecting the HUB to your network:• As a general rule, 130 meters is the maximum length for anunshielded twisted pair segment. However, losses introduced byconnections at punch-down blocks and other equipment serve toreduce this limit. In most installations, the optimal unshieldedtwisted pair length is 100 meters using standard PVC phone wire.Maximum link length is largely dependent on cable quality. Ifhigh quality, low attenuation cable is used, link lengths of up to200 meters are achievable.• The device at the other end of the twisted pair segment mustmeet IEEE 802.3 10BASE-T specifications.• The transceivers that will be connected to the HUB (via aSPIM-A) must meet IEEE 802.3 standards and must not have theSQE test function enabled.2.3.1 10BASE-T Twisted Pair Network RequirementsWhen connecting a 10BASE-T Twisted Pair Segment at any of the10BASE-T Twisted Pair HUB Ports (Ports 1 through 12, a Single Port10BASE-T Twisted Pair Segment Interface module [SPIM-T orSPIM-T1]), the following network requirements must be met:• Length - The IEEE 802.3 10BASE-T standard requires that10BASE-T devices transmit over a 100 meter (328 foot) link using22-24 AWG unshielded twisted pair wire.