Animated Optical Glossary
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EXFO Glossary

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R_CTLRAIDReal-Time Transport Protocol (RTP)
R_RDYRate-Adaptive Digital Subscriber Line (RADSL)Rec
RACSRayleigh ScatteringReceiver
Radio Access NetworkRBOCReconfigurable Optical Add-Drop Multiplexer (ROADM)
Radio Frequency (RF)RCSRedundant Array of Independent Disk (RAID)
Radio Network Controller (RNC)RDIReflection
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Acronym for: Routing control


Acronym for: Receiver ready


Acronym for:

1. Remote automatic control system

2.  Resource and admission control subsystem

Radio Access Network

Radio access network: the part of a telecommunications system that implements a radio technology (e.g. UTRA, Evolved UTRA, CDMA2000, DECT, GERAN) to access the Core Network. 

Radio Frequency (RF)

Electromagnetic carrier waves upon which audio, video or data signals can be superimposed for transmission.

Radio Network Controller (RNC)

A governing element in the UMTS radio access network (UTRAN) and is responsible for controlling the node Bs that are connected to it.

Rate-Adaptive Digital Subscriber Line (RADSL)

A version of ADSL in which modems test the line at start-up and adapt their operating speed to the fastest the line can handle.

Rayleigh Scattering

The elastic distribution of light in all directions, which is caused by interference with particles smaller than the wavelength of the light itself.


Acronym for: rich communication services


Acronym for: Remote defect indication


Acronym for: Path remote defect indication

Real-Time Transport Protocol (RTP)

A standardized packet format for delivering audio and video over IP networks. RTP is used extensively in communication and entertainment systems that involve streaming media, such as telephony, video teleconference applications, television services and web-based push-to-talk features.


Acronym for: ITU-T Recommendation


A network device that converts an incoming modulated optical signal into an electrical signal for transmission down an electrical communications circuit.

Reconfigurable Optical Add-Drop Multiplexer (ROADM)

A form of optical add-drop multiplexer that adds the ability to remotely switch traffic from a wavelength-division multiplexing (WDM) system at the wavelength layer.

Redundant Array of Independent Disk (RAID)

A storage technology that combines multiple disk drive components into a logical unit. Data is distributed across the drives in one of several ways called "RAID levels", depending on what level of redundancy and performance is required.


The immediate change in the direction of light as it passes from one medium to another.