Cabletron Systems MRX Installation Manual

Cabletron Systems MRX Installation Manual Manual pdf 15 page image

Page 2-4REQUIREMENTS/SPECIFICATIONS• Noise - Noise can be caused by either crosstalk or externallyinduced impulses. Impulse noise may cause data errors if theimpulses occur at very specific times during data transmission.Generally, the user need not be concerned about noise. If noise-related data errors are suspected, it may be necessary to eitherreroute the cable or eliminate the source of the impulse noise.• Temperature - Multi-pair PVC 24 AWG telephone cablestypically have an attenuation of approximately 8 to 10 dB/100 mat 20° C (78° F). The attenuation of PVC insulated cable variessignificantly with temperature. At temperatures greater than40° C (104° F), it is strongly recommended that you use plenum-rated cables to ensure that cable attenuation remains withinspecification.2.3.2 Fiber Optic Network RequirementsWhen connecting a Fiber Optic Link Segment to the HUB with aSingle Port Fiber Optic Interface module (SPIM-F1 or SPIM-F2), thefollowing network requirements must be met:• Cable Type - The SPIM-F1 and SPIM-F2 are designed for usewith one of the following multimode fiber optic media:- 50/125 μm fiber optic cabling.- 62.5/125 μm fiber optic cabling.- 100/140 μm fiber optic cabling.• Attenuation - The fiber optic cable must be tested with a fiberoptic attenuation test set that is adjusted for an 850 nmwavelength. This test verifies that the signal loss in a cable iswithin an acceptable level:- 13.0 dB or less for 50/125 fiber cable segment.- 16.0 dB or less for 62.5/125 fiber cable segment.- 19.0 dB or less for 100/140 fiber cable segment.