Glossary
Term | Main definition |
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Hicap service |
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High Density | High Density also known as HDC or HD
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Home-run cable |
A cable run that connects a user outlet directly with the
telecommunications or wiring closet. This cable has no
intermediate splices, bridges, taps, or other connections.
Every cable radiates out from the central equipment or
wiring closet. This configuration is also known as star
topology and is the opposite of a daisy-chained cable
that may have taps or splices along its length. Home-run
cable is the recommended installation method for horizontal
cabling in a structured cabling system.
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Homojunction structure |
An LED design in which the pn (P-type and N-type
semiconductor) junction is formed from a single semiconductor
material
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Hood | May also be referred to as Back Shell, Cover. Tip: There are four things to consider with hoods. Size, Material, method of Fixing and Cable entry. i) The size of the hood will be determined by the size of the connector you wish to cover. A 50W Telco will require a 50W Hood and so on. ii) Hoods are either secured by two screws either side or the Snap fit version this allows the two sides to snap together without the aid of screws. iii) Hoods may come as plastic in various colours most common is black. Hoods may also be Metal (see Shielded). iv) Hoods may have 180, 90, or 45 degree cable entry hole.
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Hop |
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Horizontal cabling |
The cabling between and including the telecommunications
outlet and the horizontal cross-connect. Horizontal
cabling is considered the permanent portion of a link;
may also be called horizontal wiring.
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Horizontal cross-connect (HC) |
A cross connect that connects the cabling of the work
area outlets to any other cabling system (like that for
LAN equipment, voice equipment).
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Hub |
A device that contains multiple independent but connected
modules of network and internetworking equipment
that form the center of a hub-and-spoke topology.
Hubs that repeat the signals that are sent to them are
called active hubs. Hubs that do not repeat the signal
and merely split the signal sent to them are called passive
hubs. In some cases, hub may also refer to a repeater,
bridge, switch, or any combination of these.
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Hybrid adapter |
A mating or alignment sleeve that mates two different
connector types such as an SC and ST.
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Hybrid cable |
A cable that contains fiber, coaxial, and/or twisted-pair
conductors bundled in a common jacket. May also refer
to a fiber-optic cable that has strands of both single-mode
and multimode optical fiber.
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Hybrid connector |
A connector containing both fiber and electrical
connectivity.
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Hybrid mesh network |
Hybrid networks use a combination of any two or more
topologies in such a way that the resulting network does
not exhibit one of the standard topologies (e.g., bus, star,
or ring). A hybrid topology is always produced when
two different basic network topologies are connected.
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Hydrogen loss |
Optical signal loss (attenuation) resulting from hydrogen
found in the optical fiber. Hydrogen in glass absorbs
light and turns it into heat and thus attenuates the light.
For this reason, glass manufacturers serving the fiberoptic
industry must keep water and hydrogen out of the
glass and deliver it to guaranteed specifications in this
regard. In addition, they must protect the glass with a
cladding that will preclude the absorption of water and
hydrogen into the glass.
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Hypalon |
A DuPont trade name for a synthetic rubber (chlorosulfonated
polyethylene) that is used as insulating and jacketing
material for cabling.
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