There was a question that came up not too long ago from someone browsing our
website. They noticed that we commonly changed the terms in which we refer to our
cables. Most notably is the way we mention Ethernet and Networking cable. In
reality there really isn't any difference between the two terms. They can be
both interchangeable when referring to our cables. The thing is though they were
wondering what is a LAN cable
and is there any difference between that and an ethernet cable? In this article we
will break down this term for a better understanding on ethernet terminology.
What Is A LAN?
To begin this article lets first start with exactly what is a LAN? A LAN stands
for local area network and it is a computer network that interconnects computers in
a certain area such as homes, universities, offices, commercial buildings, labs and
just about any place with a range of computers in a close vicinity. LANs are vital
in computer networking and just about any computer you use is connected to another
device in some way. Not only are there small scale network connections but they can
vary in size. What about over large areas of land, say large corporations and
governments? These are called wide area networks.
The beginning of a Local Area Network (LAN) began in the 1970's with the
increase in the need for high speed interconnections of computers in universities
and laboratories. With the introduction of ethernet by Xerox in 1973-1974 LAN would
soon be off to the races. The first introduction of LAN is a major use case came
with the install of it in 1977 at the Chase Bank in New York City.
Now that you've got a little bit of an intro and background to LAN
let's dive into how does a LAN actually work?
What Products Are In A LAN?
Whether you're in your home or business you're probably going to be
apart of some sort of LAN. The simplest way of setting up a Local Area Network
(LAN) is to use an ethernet cable. But what about a LAN cable? This is where the
customers question comes in to play. A LAN cable refers to the same thing as an
ethernet or networking cables. So when shopping for a LAN cable and you come across
an ethernet or networking cable you will be fine. So in definition a LAN cable is
cable that connects to computers, network switches and then from the switch to a
router, modem or dsl which powers your internet from a internet service provider.
These devices when connected together with a wireless LAN, ethernet or networking
cable form a LAN (Local Area Network).
coaxial cable
Coaxial cable is a type of copper cable specially built with a metal shield and
other components engineered to block signal interference. It is primarily used by
cable TV companies to connect their satellite antenna facilities to customer homes
and businesses. It is also sometimes used by telephone companies to connect central
offices to telephone poles near customers. Some homes and offices use coaxial
cable, too, but its widespread use as an Ethernet connectivity medium in
enterprises and data centers has been supplanted by the deployment of twisted pair
cabling.
Coaxial cable received its name because it includes one physical channel that
carries the signal surrounded -- after a layer of insulation -- by another
concentric physical channel, both running along the same axis. The outer channel
serves as a ground. Many of these cables or pairs of coaxial tubes can be placed in
a single outer sheathing and, with repeaters, can carry information for a great
distance.
Coaxial cable was invented in 1880 by English engineer and mathematician Oliver
Heaviside, who patented the invention and design that same year. AT&T established
its first cross-continental coaxial transmission system in 1940. Depending on the
carrier technology used and other factors, twisted pair copper wire and optical
fiber are alternatives to coaxial
cable.
How coaxial cables work
Coaxial cables have concentric layers of electrical conductors and
insulating material. This construction ensures signals are enclosed within the
cable and prevents electrical noise from interfering with the signal.
The center conductor layer is a thin conducting wire, either solid or braided
copper. A dielectric layer, made up of an insulating material with very well-
defined electrical characteristics, surrounds the wire. A shield layer then
surrounds the dielectric layer with metal foil or braided copper mesh. The whole
assembly is wrapped in an insulating jacket. The outer metal shield layer of the
coaxial cable is typically grounded in the connectors at both ends to shield the
signals and as a place for stray interference signals to dissipate.
Overview:
Short for Category 5E, CAT5E cable is network Ethernet cabling that consists of four twisted
pairs of copper wire terminated by RJ45 connectors. While the base standard set by
TIA/EIA for CAT5E is 100 MHz, our CAT5E cable supports frequencies up to 350 MHz
and for 10/100/1000 Base-T Ethernet. Additionally, CAT5E Ethernet cable can be used
for voice, video, data, ATM, token ring, and direct networking. CAT5E cable runs
should be limited to a maximum length of 328 feet (100 meters)
Currently, CAT5E is the standard for data cabling communication with CAT6,
CAT6A, and CAT7 being faster. Computers hooked up to a LAN are connected using
CAT5E cables, so if you are on a LAN, most likely the cable running out of the back
of your PC is Category 5E.
CAT5E Ethernet cable has 4 twisted pairs and comes in a variety of options that
will enhance your network installation.
Solid CAT5E Cable supports long cable runs and is designed for fixed cabling
situations like homes, offices, and buildings. We carry a few options (view below),
including Fire-safety rated and outdoor/direct burial cat5E.
Stranded CAT5E cable is more pliable and better suited for shorter-distances.
It features six small diameter wires surrounding a center conductor wire inside
each of the twisted pairs. By having multiple small wires instead of a single solid
conductor, stranded cable is more flexible, making it preferable for short distance
cable runs. Stranded cat5E cable is commonly used for patch cables or crossover
cables.
What is a power cord used for?
A power cord
consists of cable with a country-specific plug (molded or hand-wired) on one
end and exposed conductor wires, terminated conductors, or blunt/flush cut
conductors on the other end. A power cord is used to connect the equipment directly
to the power mains.
A power supply cord is an essential element of all cord
connected electrical equipment; it supplies the connection between the equipment
and the electrical mains. The power cord can be hard wired to the equipment or it
can be detachable. The hard wired (non-detachable) power cord consists of a plug,
the cordage, and a strain relief device to secure the cord to the equipment
enclosure. The detachable power cord, also known as a power cord set, consists of a
plug, cordage and a connector or receptacle. Though seemingly a simple component,
when it comes to regulatory approvals, it can become an exceedingly complicated
component.
This article shall cover some of the aspects of power cords
intended for use in information technology equipment (ITE) and consumer products
applications. Other types of power cords, such as those for outdoor use or for
hazardous locations, are a topic for another article.
Power supply cords typically have two or three wires. These
wires are “line,” “neutral” and “ground.” The International Electrotechnical
Commission’s standard IEC 60446 uses the following color codes:
In North America, the line wire is black in color, while it
is either brown or grey in the rest of the world;
In North America, the neutral wire is white, while it is
blue elsewhere; and
In North America, the ground wire is typically green, while
it is green with yellow stripes in the rest of the world.
It is crucial to ensure that the electrical rating of the
UK power cord
supplied with the product is higher than that of the product being powered. Most
product standards require the plug to be rated at least 125 percent of the rated
current of the equipment. An under-rated power cord can result in the power cord
overheating, and possibly causing an electrical fire. Power cords designed for use
with ITE equipment in North America are rated as 125Vac/10A, but other higher
ratings are also available.
Non-Detachable Power Cords
The non-detachable power cord is hard wired to the
equipment enclosure, and is generally not meant to be removed from the equipment
enclosure. The power cord consists of a plug, the cordage and a strain relief
connector to secure the cord to the device.
A common means of attaching the stripped end of a non-
detachable power cord (see Figure 1) is a lug/ring terminal. One end of the
terminal consists of a metallic ring or “loop” that slips over and is attached to
a power terminal post or screw. The other end of the lug/ring terminal is generally
crimped onto the stripped power cord wire. One lug-ring terminal is attached to one
power cord wire. It is important to remember that, when using this form of
terminal, the crimp tool must be approved for the terminal for which it is being
used. It is good engineering practice to double crimp the lug/ring terminals.
Manufacturers of
large equipment that use non-detachable power cords will occasionally ship their
power supply cords disassembled from the equipment. This is because the power
supply cords are typically very large and very long, and the cords may be damaged
during shipping. In such instances, U.S. nationally recognized testing laboratories
(NRTLs) do allow for this, provided certain conditions are met. These conditions
include:
Justification as to why the power cord must be
disassembled;
The assembly of the disassembled equipment must be
performed by qualified service personnel;
Detailed assembly instructions must be provided that
address all aspects of the re- assembly, including connection of the main earthing
terminals;
Instructions that state that no replacement cord shall be
used other than the one shipped with the product; and
A suitable means of securing the power cord to the
enclosure is provided, such as a strain relief grommet.
Flexible cords cannot be used for equipment that requires
the cord to be hard wired into the device. Fixed equipment with a flexible cord and
plug must be designed to allow for the cord to be detachable for repair and
maintenance purposes, per sections 400.7 and 400.8 of the National Electric Code.
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