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TechWaTch
New Hybrid Cables Power GPON Networks
By Ed Sullivan F
or enterprise networks, the ad- vantages of gigabit passive op- tical networks (GPONs) are un-
deniable. These all-fiber networks cost less to implement than copper, provide the potential for nearly un- limited bandwidth, and are passive, requiring much less power. Single- mode passive optical LAN infrastruc- ture will support 10G-PON networks and beyond. By including copper in the same
cable as GPON fiber, high-band- width data and power can be sup- plied to numerous users with a sin- gle, lower-cost option. This is a sim- ple, elegant solution that is increas- ing in popularity for commercial ap- plications. These cables can be used for multiple, separated nodes and in buildings where new, data-hungry
equipment is constantly being added to the network. With the addition of power to
hybrid fiber copper cabling, the bene- fits of GPON networks have never been greater. By including two cop- per conductors within the same jack-
benefit to aging buildings that expe- rience frequent power outages.
GPON Defined At its most simple, GPON
makes use of a single fiber optic strand, through which high-speed,
Gigabit Passive Optical Networks (GPONs) make use of a single fiber optic strand, through which high-speed, high-bandwidth data is transmitted in both directions (2.48 Gb/s downstream and 1.24 Gb/s upstream).
et as the fiber optic strand, external power can now essentially be “pushed” from a central location. This further simplifies installa-
tion and reduces costs by eliminating the need to run dedicated electric wiring. It can also be a significant
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high-bandwidth data is transmitted in both directions (2.48 Gb/s down- stream and 1.24 Gb/s upstream). The information is transmitted
from the optical line terminal (OLT) through passive optical splitters to specific locations where users are grouped. A small device called an op- tical network terminal (ONT) en- ables the connection of end users. In a typical GPON network,
each ONT must be plugged into a nearby AC power outlet. In an effort to simplify installation, new hybrid cabling solutions are now available that eliminate that requirement. In- stead, power is supplied to many ONTs from a centralized location, us- ing a hybrid cable with both fiber and copper conductors. Currently, GPON technology is
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the highest-speed network infra- structure available on the market. The drivers behind today’s passive optical networks include high relia- bility, relatively low cost and passive functionality. Its flexibility and cost- efficiency allow it to be used in a broad range of applications, includ- ing multichannel transmission, dis- tribution, bit rate limiting, optical connections, communications, and many others. GPON technology adds the benefit of passing both down- stream and upstream data along a single fiber.
Hybrid GPON Cabling One of the first examples of this
hybrid technology has been devel- oped by Optical Cable Corporation (OCC). The company recently re- leased its UL-listed Slimline hybrid cable solution for GPON networks. The cable contains one or two
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strands of single-mode fiber with two copper wires that carry electrical power to each ONT. These copper and fiber optic elements are bundled together in a single jacket. The cable is UL plenum-rated for use inside buildings, including above suspend- ed ceilings.
OCC’s cable has a small bend
radius and a tensile strength almost three times that of conventional cat- egory 6 copper cable. As a technolo- gy, GPON is considered “future- proof,” because in many instances it is capable of handling increased loads for decades to come. “With this GPON system you
can keep adding applications, be- cause single-mode fiber has virtually
May, 2018
Slimline hybrid cables consist of individual insulated copper conductors and optical fibers located in a radially symmetrical pattern.
unlimited bandwidth,” says Mike Long, LEED Green Associate, and senior network consultant for OCC. “This is significant, since many com- munications electronics have a cycle of approximately five years, with each generation typically requiring more bandwidth.” The 18-gauge copper conductors
included in the Slimline hybrid cable were also designed to meet the needs of the future. The cable was built in- tentionally to handle more than what is required by most of today’s de- vices, while capable of meeting the increasing power demands expected in the near future. “If telecom technology keeps ad-
vancing at the rate it has and we need to power something that exceeds the current Class 2 standard, this design
will support it,” says Long. Contact: Optical Cable Corp.,
6290 Concourse Drive, Roanoke, VA 24019 % 800-622-7711 fax: 540-265-0724 E-mail:
info@occfiber.com Web:
www.occfiber.com r
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