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| Communications - Glossary |
6308 Seven Seas Ave, Bakersfield CA 93308 (661-589-WIRE) |
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| Glossary of Communications Terms P-R |
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POP -
Point of presence - This is a point-of-presence of an Internet service provider,
used to facilitate remote users' access to the range of applications and IP addresses
in the internetwork. It is the location of a switching dial-in facility, usually
for a long-distance telecommunications provider or an Internet service provider.
Also, a local telephone number through which you can access your ISP.
Post Office Protocol. An extensible protocol for retrieving email from a remote server.
Packet - A block of information sometimes called a cell, frame, data unit, server
unit, or signaling unit. Although each of these elements does have unique attributes, in essence, all are packets.
Photodetector - In a lightwave system, a device that turns pulses of light into bursts of electricity.
Photodiode - Light detector in a fiber optic signal transport system that generates an electric
current in proportion to the intensity of the light falling on it.
Plain Old Telephone Service - The analog dial-tone-type telephone networks and services in place
worldwide, with transmission rates up to 52Kbps. In contrast, telephone services based on digital communications
lines, such as ISDN, have higher speeds and bandwidths. The POTS networks also called the public switched telephone network.
Public Switched Telephone Network (PSTN) - The worldwide telephone network.
RJ-45 Connector - Registered Jack-45. A telephone connector that holds up to eight wires.
RJ-45 plugs and sockets are used in Ethernet and Token Ring devices.
RJ-48C - An eight-position keyed plug most commonly used for connecting T1 circuits. The RJ-48C is an
eight-position plug with four wires (two for transmit, two for receive) commonly connected. When the phone company delivers
T1 to your offices, it usually terminates its T1 circuit on a RJ-48C. And it expects you to connect that RHJ-48C to your
phone system or T1 channel bank and then to your phone system.
Receiver - A device which receives a transmitted signal
Redundancy - Having one or more backup systems available in case the primary system fails.
Reflection - The abrupt change in the direction of light as it travels from one material to a dissimilar material.
Some of the reflected power in a fiber gets transmitted back to the source.
Refraction - The bending of light as it passes through two dissimilar materials or in a medium whose
refractive index varies smoothly. Important in fiber optic technology.
Refractive Index - The ratio of the speed of light in a vacuum to its speed in a given material such as glass.
The larger the ratio, the more the light entering the material is bent. Important in fiber optic technology.
Regenerator - In a lightwave system, an electronic circuit that reconverts the electrical signals
to light pulses and a laser that speeds them on their way.
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