Enterasys mrx Installation Instruction

Page 2-4

Noise - Noise can be caused by either crosstalk or externally
induced impulses.  Impulse noise may cause data errors if the
impulses 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 either
reroute the cable or eliminate the source of the impulse noise.

Temperature - Multi-pair PVC 24 AWG telephone cables
typically have an attenuation of approximately 8 to 10 dB/100 m
at 20

°

 C (78

°

 F).  The attenuation of PVC insulated cable varies

significantly with temperature.  At temperatures greater than
40

°

 C (104

°

 F), it is strongly recommended that you use plenum-

rated cables to ensure that cable attenuation remains within
specification.

When connecting a Fiber Optic Link Segment to the HUB with a
Single Port Fiber Optic Interface module (SPIM-F1 or SPIM-F2), the
following network requirements must be met:

•

Cable Type - The SPIM-F1 and SPIM-F2 are designed for use
with one of the following multimode fiber optic media:

-

50/125 

µ

m fiber optic cabling.

-

62.5/125 

µ

m fiber optic cabling.

-

100/140 

µ

m fiber optic cabling.

•

Attenuation - The fiber optic cable must be tested with a fiber
optic attenuation test set that is adjusted for an 850 nm
wavelength.  This test verifies that the signal loss in a cable is
within 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.