User`s guide

Volume 3—Power Distribution and Control Assemblies CA08100004E—November 2013 www.eaton.com V3-T9-275
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9.5
Metering Devices, Protective Relays, Software and Connectivity
Connectivity Options
Fiber Optic Technology
The use of fiber optics in
telecommunications and wide
area networking has been
common for many years, but
more recently fiber optics
have become increasingly
prevalent in industrial data
communications systems
as well. High data rate
capabilities, noise rejection
and electrical isolation are
just a few of the important
characteristics that make
fiber optic technology ideal
for use in industrial and
commercial systems.
Although often used for point-
to-point connections, fiber
optic links are being used to
extend the distance
limitations of RS-232, RS-422/
485 and Ethernet systems
while ensuring high data rates
and minimizing electrical
interference.
Conventional electrical data
signals are converted into
a modulated light beam,
introduced into the fiber and
transported via a very small
diameter glass or plastic
fiber to a receiver that
converts the light back into
electrical signals.
Optical fibers allow data
signals to propagate through
them by ensuring that the
light signal enters the fiber
at an angle greater than the
critical angle of the interface
between two types of glass.
Optical fiber is actually made
up of three parts. The center
core is composed of very
pure glass. Core dimensions
are usually in the range
of 50 to 125 um for multi-
mode cables and 8-9 um for
single-mode cables. The
surrounding glass, called
cladding, is a slightly less
pure glass. The diameter of
the core and cladding
together is in the range of
125 to 440 um.
Surrounding the cladding is a
protective layer of flexible
silicone called the sheath.
Fiber Optic Cable
Wiring Guidelines
The following information
can be used as a guide
when designing an Ethernet
system using Fiber Optic
Ethernet Cable:
●
Select a fiber cable that is
suited for the application,
e.g., outdoor, aerial, duct,
intra-building, risers,
general building and
plenum applications
●
Fiber optic cable is useful in
applications where the
environment is combustible,
electrically noisy, the cable
must be bundles with high
voltage wires or where
common mode voltages
may exist between the
earth ground points of the
terminating connectors
●
Fiber optic cable is
available in various
operating temperature
ranges. Care should be
taken to match the
temperature rating of the
fiber to the environment it
will be exposed to. The
temperature specification
for fiber may be narrower
than copper cable. Consult
the cable manufacturer for
temperature specifications
of your cable type
●
Sealed fiber connectors are
available for use in harsh
environments to prevent
contamination from
entering the connector and
fiber. The type of seal
required will be application
dependant and can vary
from dust- and moisture-
proof to water-tight
●
Mixing fiber cable types is
not permitted. The same
core dimensions and mode
must be used within
cable segments
●
Care should be taken when
purchasing connectors to
include strain relief, which
reduces mechanical strain
(vibration) within the cable,
as well as the connector.
Strain relief also provides
support to the cable
to ensure proper bend
radius at the connector
●
Single-Mode Fiber is
used for long distance
transmission of up to
120 km. Distance may vary
depending on speed and
type of converter used
●
Multi-Mode Graded-Index
Fiber Cable is used for
communication over
shorter distances of up
to 2 km
●
Fiber cable is composed of
glass and is not well suited
for applications requiring
tight bend radiuses. Cable
radius dimensions vary per
manufacturer. If the
manufacturer does not
provide a bend radius, a
typical rule of thumb is a
radius not less than 15x the
cable diameter
●
Fiber cable to connector
terminations can be
performed in the field
using special equipment.
This method is not
recommended
●
Tier One testing is
recommended when
diagnosing system
irregularities and should
be performed in all new
installations
●
Tier Two testing is
recommended to certify
that a system complies
with standards set forth
by the owner/installer
Dimensions
Packaging
Description Specifications
Dimensions of PXES4P series
Weight of PXES4P series
3.5 in H x 3.0 in W x 1.0 in D (8.9 cm x 7.6 cm x 2.5 cm)
8.6 oz. (243g)
Dimensions of PXES6P series
Weight of PXES6P series
3.6 in H x 3.0 in W x 1.7 in D (9.2 cm x 7.6 cm x 4.3 cm)
13 oz. (370g)