Creative USB Adapter CB2431 Bedienungsanleitung PDF herunterladen (Seite 115)

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HDCS

Glossary

IDC



that slices through the cable insulation to make a

connection. Eliminates the need to strip insulation.

 Private Branch Exchange

IEEE Institute of Electrical and Electronics Engineers. PC Physical Contact.

Impedance



conductor.

Pigtail

Optical fiber cable that has a connector installed on one

end.

Index of

Refraction

The ratio of light velocity in vacuum to its velocity in a

given transmission medium.

Plenum





Index Matching

Fluid

 

that reduces Fresnel reflections caused by refractive-

index differences.

Power sum

   



Jumper

Usually short cables with connectors installed used to

make a cross connection.

Propagation

delay

The amount of time it takes a signal to travel through a

copper cable or system.

Kbps 

Propagation

delay skew

The difference in propagation delay between the slowest and

fastest pairs in a copper cable or system.

   

   

  Punch down

Refers to IDC connectors and the method used to terminate

them.



The part of the horizontal cabling system between the

work area outlet and the telecom closet termination.

Rack

Used to mount patch panels, enclosures and equipment in

the telecom closet. Usually 19" wide by 7' high.



cable



in buffer tubes offering excellent fiber protection and

segregation.

Receiver

   

electrical signals.

  Repeater

   

allow an increase in the system length.

Mbps  Return loss



as a result of impedance variations in the copper or fiber

cabling system.

Mechanical

Splicing

  

mechanical means to enable a continuous signal.

Riser

Pathways for indoors cables that pass between floors. It

   

indoor cable.

MHz

  

frequency or frequency range (bandwidth) through which



RJ11 

Mode

   



RJ45 

Modular jack



"telephone jack".

SC connector Subscriber or Square connector.

Modular plug

  

"telephone plug".

Single mode





MT-RJ  Splicing 

Multimode

   

mode. Typical core/cladding size is 50/125 um.

ST connector Straight tip connector.



Near End Crosstalk. The unwanted noise coupled into a

device's receive circuit from its transmit circuit.

STP Shielded Twisted Pair.

NIC Network interface card. STS Synchronous Transport Signal.

Node  Transmitter

   

informationcarrying signal to a corresponding optical signal



Numerical



The number that expresses the light-gathering ability of



Thicknet 

OFCP Optical Fiber Conductive Plenum. Thinnet

   

cable.

OFCR Optical Fiber Conductive Riser. Token ring 

OFNP Optical Fiber Nonconductive Plenum.

Twisted pair

cable

Cable made from pairs of wires, which have been twisted

together.

OFNR Optical Fiber Nonconductive Riser.  

OTDR  UTP Unshielded twisted pair cable.

Outlet Where the horizontal cabling terminates in the work area.  

Patch cord

    

used to make a cross connection.

Wavelength

The distance between two successive points of an

electromagnetic waveform.

Patch panel



common housing.



Wavelength

Wavelength at which the chromatic dispersion of an optical



material dispersion.

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