Optical communications repeater definition of Optical communications repeater in the Free Online Encyclopedia.

Repeater, Active

receiving and transmitting radio device installed at intermediate points in radio communications links, designed to amplify received signals and then retransmit them farther along the link. The intermediate point may be mobile, as a communications satellite, or stationary, as a relay tower. An active repeater consists of an antenna or several antennas, a radio receiver, a radio transmitter, equipment for remote control of repeater operation, and a power supply. The active repeater usually uses solid-state devices; vacuum tubes are used less frequently. The output stages of the radio transmitter usually incorporate traveling-wave tubes.

In contrast to a passive repeater, an active repeater is capable of providing service only to a limited number of links in a communications network. In order to eliminate mutual interference during simultaneous reception and transmission of radio signals, active repeaters use frequency-division, time-division, and coded squelch. Mutual interference is also eliminated by maintaining the signal level within predetermined limits and by protecting the transmitter against overloads (the total power of all transmitted signals must not exceed the permissible loading of the transmitter). Active repeaters often have standby equipment that can be switched in automatically.

Mentioned in	?		Encyclopedia browser	?		Full browser	?
No references found			optical antipode Optical Antipodes optical aspherical surface Optical Axis optical bands optical bar-code reader Optical Bench Optical Binary Stars optical bistability optical branch Optical Brighteners optical calcite Optical Caliper Optical Carrier 12 Optical Carrier 3 Optical Carrier 48 Optical Carrier n optical center optical channel optical character recognition optical coating optical coherence microscopy optical coherence tomography Optical Communication Optical communications Optical communications repeater optical comparator Optical Compensator optical computer Optical Contact optical coupler optical coupling optical cross-connect optical crystal optical cytopherometry optical data storage Optical Density optical depth Optical Detection and Ranging optical detection of magnetic resonance Optical Detector Optical detectors optical diff optical diffraction velocimeter optical direction and ranging optical disc optical disc library optical disk optical disk storage optical dispersion optical distance			Optical Coating Laboratories, Incorporated Optical coatings Optical Coatings Japan Optical Code Division Multiple Access Optical Code Division Multiplexing Optical Coherence Domain Reflectometer optical coherence microscopy Optical coherence tomography Optical coherence tomography Optical coherence tomography Optical coherence tomography Optical coherence tomography Optical coherence tomography Optical Colonoscopy Optical Combat Identification System Optical Committee of Turkey Optical communication Optical Communication Engineering Sdn Bhd Optical Communication Over Clear Atmosphere Optical Communication Parallel Computer Optical Communication Products, Inc. Optical Communication Research Lab Optical Communication Systems and Networks Optical Communication Thru the Shuttle Window Optical communications Optical communications Optical Communications and Photonic Networks Optical Communications Demonstrator Optical Communications Mainframe Rackmount Optical Communications Products, Inc Optical communications repeater Optical Communications Supplement Optical Communications Telescope Laboratory optical comparator Optical Compensator Optical Component Environmental Test System Optical Composite Burst Switching optical computer optical computer Optical computing Optical computing Optical Concentration Device optical condenser Optical Connection Controller Optical Connector Interface optical contact Optical Continuous Wave Reflectometer Optical Control Card Optical Control Electronics Optical Control Electronics - Enhancement Kit Optical Control Plane Optical Control Plane Requirements Optical Control Room Optical Control Subsystem Optical Control System Optical Controller Pack Optical Cooling Laboratory Incorporated

Active Repeater (redirected from Optical communications repeater)

REFERENCE

Active Repeater
(redirected from Optical communications repeater)