Net Optics GigaBit Fiber Media Converter - Manual (Page 8)

GigaBit Fiber Media Converter
Connecting the GigaBit Media Converter to the Network
Connecting the GigaBit Fiber Port to the Network:
1 ..Unpack.the.GigaBit.Media.Converter,.verify.that.you.have.all.components,.
and.obtain.the.required.cables.needed.to.successfully.install.the.unit .
2 ..Using.a.duplex.SC.cable,.connect.the.appropriate.switch,.server,.or.router.
to the GigaBit Media Converter's fiber port..
The.use.of.singlemode.or.multimode.cabling.is.determined.by.the.GigaBit.
media.Converter.model.purchased .
Note: ________________________________________________________________
For connections with legacy devices, where Fiber Port negotiation is not pres-
ent, it will be necessary to disable the toggle switch (FPN) on the side of the
unit and power cycle the tap.
______________________________________________________________________
Multimode 1000BaseSX ports on CV-SX/GCU Series converters are
connected.via.standard.50/125µm,.62 .5/125µm.or.100/140µm.multimode.
fiber. Singlemode 1000BaseLX ports are connected by 8.5µm singlemode
fiber. Singlemode 1000BaseLX ports also may be used to increase the
transmission distance over multimode fiber cable.
When.installing.the.GigaBit.Media.Converter,.care.must.be.taken.in.choos-
ing the appropriate cabling to avoid Differential Mode Delay (DMD) effects.
DMD is caused by singlemode, (1310 nanometer) laser point sources launch-
ing.into.multimode.cable ..Optical.power.is.concentrated.in.the.center.of.the.
fiber core, propagating in less than 5% of possible modal paths. This can
result.in.reduced.bandwidth.and/or.the.appearance.of.individual.data.pulses,.
refracting.into.multiple,.overlapping.light.pulses.at.the.receiver.end,.therefore.
causing.CRC.errors ...
The.connection.requires.a.Mode.Conditioning.patch.cable.to.provide.the..
Conditioned Launch necessary to prevent (DMD) effects. Mode Condition-
ing patch cables are not used with short wave length (850 nano-meter) lasers.
Note that fiber cable is typically certified for a particular bandwidth using light
emitting diodes (LEDs) that provide the “Overfilled Launch” condition i.e.
illuminate all possible modes and fibers.
For.additional.details.see.the.Restricted Launch Specification defined by the
Telecommunications.Industry.Association ..The.TIA.FO-2 .2 .1.Committee.has.
released two standards: (1) FOTP-203: Launched Power Distribution Mea-
surement Procedure for Graded-Index Multimode Fiber Transmitters, and (2)
FOTP-204:.Measurement.of.Bandwidth.on.Multimode.Fiber .