Installation Guide for Gigabit Fiber Media Converter
4
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 ber port.
The use of singlemode or multimode cabling is determined by the GigaBit
Media Converter model purchased.
Multimode 1000BaseSX ports on NET-1000SX Series converters are
connected via standard 50/125µm, 62.5/125µm or 100/140µm multimode
ber. Singlemode 1000BaseLX ports are connected by 8.5µm singlemode
ber. Singlemode 1000BaseLX ports also may be used to increase the
transmission distance over multimode ber 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
ber 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 ber cable is typically certied for a particular bandwidth using light
emitting diodes (LEDs) that provide the “Overlled Launch” condition i.e.
illuminate all possible modes and bers.
For additional details see the Restricted Launch Specication dened 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.
