ADH Communications just joined Manta.

ADH Communications becomes the manufactures representative for YR20 for the SouthEast.

ADH Communications becomes an authorized reseller for SonicWall.

ADH Communications just joined the Chamber of Commerce of Gwinnett County!

ADH Communications has projects going on in 7 different states!

I have worked with Hartmut and ADH on several occasions. “The ADH goal of providing one with the best technology yet cost effective solutions shows their concern for their customers”
-Tim O’Neill  - The “Oldcommguy™”
B.T. Solutions, Inc.

A leading supplier for converged networks

Provides the best possible solution at the best possible price

Is a partner to our customers

Helps with all your needs to design, install and maintain your mission critical networks

Providing, Installing & Supporting
-Wired and wireless networks
-Triple play networks infrastructure
-High speed back-bone networks
-Industrial Ethernet production control networks
-And more

PO Box 443
Lake Geneva, WI 53147


or simply fill out the form on the contact page.

ADH Communications Manta Profile


Fiber Optics

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Numbers


Radiation-hardened Fiber: An optical fiber made with core and cladding materials that are designed to recover their intrinsic value of attenuation coefficient, within an acceptable time period, after exposure to a radiation pulse.
Radiometer: An instrument, distinct from a photometer, to measure power (Watts) of electromagnetic radiation.
Radiometry: The science of radiation measurement.
Raman Amplifier: An optical amplifier based on Raman scattering which generates many different wavelengths of light from a nominally single-wavelength source by means of lasing action or by the beating together of two frequencies. The optical signal can be amplified by collecting the Raman scattered light.
Random Jitter (RJ): Random jitter is due to thermal noise and may be modeled as a Gaussian process. The peak-to-peak value of RJ is of a probabilistic nature, and thus any specific value requires an associated probability.

Random Jitter vs. Optical Loss

Rayleigh Scattering: The scattering of light that results from small inhomogeneities of material density or composition.
Rays: Lines that represent the path taken by light.
Receiver: A terminal device that includes a detector and signal processing electronics. It functions as an optical-to-electrical converter.
Elements of a Transmitter and Receiver
Receiver Overload: The maximum acceptable value of average received power for an acceptable BER or performance.
Receiver Sensitivity: The minimum acceptable value of received power needed to achieve an acceptable BER or performance. It takes into account power penalties caused by use of a transmitter with worst-case values of extinction ratio, jitter, pulse rise times and fall times, optical return loss, receiver connector degradations, and measurement tolerances. The receiver sensitivity does not include power penalties associated with dispersion, or backreflections from the optical path; these effects are specified separately in the allocation of maximum optical path penalty. Sensitivity usually takes into account worst-case operating and end-of-life (EOL) conditions.
Recombination: Combination of an electron and a hole in a semiconductor that releases energy, leading to light emission.
Refraction: The changing of direction of a lightwave in passing through a boundary between two dissimilar media, or in a graded-index medium where refractive index is a continuous function of position.
Refractive Index: A property of optical materials that relates to the speed of light in the material versus the speed of light in a vacuum.
Refractive Index Gradient: The description of the value of the refractive index as a function of distance from the optical axis along an optical fiber diameter. Also called refractive index profile.
Regenerative Repeater: A repeater, designed for digital transmission, in which digital signals are amplified, reshaped, retimed, and retransmitted.
Regenerative Repeater
Regenerator: Synonym for regenerative repeater.
Repeater: A receiver and transmitter set designed to regenerate attenuated signals. Used to extend operating range.
Return Path: A communications connection that carries signals from the subscriber back to the operator. The return path allows for interactive television and on-demand services, such as pay-per-view, video on demand, and interactive games.
Return Path Hybrid Fiber Coax Network
Residual Loss: The loss of the attenuator at the minimum setting of the attenuator.
Responsivity: The ratio of a photodetector’s electrical output to its optical input in Amperes/Watt (A/W).
Return Loss: See optical return loss.
RF: Abbreviation for radio frequency. Any frequency within the electromagnetic spectrum normally associated with radio wave propagation.
RF Carrier: An AM technique wherein a carrier, with a frequency much higher than the encoded information, varies according to the amplitude of the information being encoded.
RFI: Abbreviation for radio frequency interference. Synonym for electromagnetic interference.
RGB: Abbreviation for red, green, and blue. The basic parallel component set in which a signal is used for each primary color, or the related equipment or interconnect formats or standards.
Ribbon Cables: Cables in which many fibers and/or copper wires are embedded in a plastic material in parallel, forming a flat ribbon-like structure.
Ribbon Cable
RIN: Abbreviation for relative intensity noise. Often used to quantify the noise characteristics of a laser.
Ring: A set of stations wherein information is passed sequentially between stations, each station in turn examining or copying the information, and finally returning it to the originating station.
Ring Network: A network topology in which terminals are connected in a point-to-point serial fashion in an unbroken circular configuration.
Self-healing Ring Network Topology
Rise Time: The time taken to make a transition from one state to another, usually measured between the 10% and 90% completion points of the transition. Alternatively the rise time may be specified at the 20% and 80% amplitudes. Shorter or faster rise times require more bandwidth in a transmission channel.
Parts of a Pulse
RJ: See Random Jitter.
RMS: Abbreviation for root mean square. Technique used to measure AC voltages.
RS-250C: An ANSI recommended standard for video transmission used to evaluate the quality of a received picture quality. Different requirements exist for short-haul, medium-haul, and long-haul RS-250C. Each of these three levels is defined by the number of intermediate processing devices and the type of path (optical or electrical).
RTS: Abbreviation for request to send. In a communications network, a signal from a remote receiver to a transmitter for data to be sent to that receiver.
RZ: Abbreviation for return to zero. A common means of encoding data that has two information states called ero and ne?in which the signal returns to a rest state during a portion of the bit period.


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Copyright © 2010 by David R. Goff. Used by permission. All rights reserved.