In 1+1 Redundancy Schemes either a module or a complete path e.g. for optical signal transmission is built redundant. The main as well as the backup module/path is monitored in hot-standby. The switch over to the backup module/path can be done automatical
2G represents the second-generation cellular network standard, like GSM, used for mobile devices. It has been developed by the European Telecommunications Standards Institute (ETSI).
3G represents a set of third-generation of mobile telecommunication standard used for mobile devices. It is based on the International Mobile Telecommunications-2000 (IMT-2000) specifications. Common 3G standards are UMTS, HSPA+ and EDGE.
3G Serial Digital Interface (SDI) is defined by SMPTE (The Society of Motion Picture and Television Engineers) and consists of a single 2.970 Gbit/s serial link for uncompressed signals, standardized in SMPTE 424M. 3-Gbps (3G) enables higher resolution of
4G represents the fourth-generation of mobile telecommunication standard used for mobile devices. It is based on a set of requirements of the International Mobile Telecommunications Advanced (IMT-Advenced) specifications.
Switch to provide switching from signal source A or signal source B or vice versa. The switching can be done manually or automatically based on RF-Sensing, Dig-In or TRAC or remote controlled by SNMP.
Indication of the power supply status via dry-contacts. B-Alarm means one power supply is faulty (non-critical because of the implemented power supply redundancy in all DEV equipment). A-Alarm is the higher rated alarm indicating that two power supplies a
Accumulated Signal Power
Accumulated Signal Power or Aggregated Power or Sum Level is the integrated power of a bandwidth.
Active DEV Combiners are capable to combine up to 32 signals without loss.
Active DEV Splitters are capable to split an input up to 128 outputs without loss or additional gain.
Asymmetric digital subscriber line (ADSL) is a type of digital subscriber line (DSL) technology, a data communications technology that enables faster data transmission over copper telephone lines than a conventional voiceband modem can provide. It does th
Automatic Gain Control (AGC), automatic adjustment of gain to achieve a stable output signal level.
Dry contact connector providing information about the status of either modules or a device.
Amplitude Frequency Response
Amplitude Frequency Response is the indication of gain or loss characteristics over frequency in decibel (dB).
APC (Automatic output power control) used in optical amplifiers (EDFA) to ensure constant output power automatically.
ASI is a serial video communications standard defined by the DVB consortium for use in transporting MPEG-2 encoded video streams. The standard is most commonly used to transports MPEG-2 streams. Data is transported at a rate of 270 Mb/s. A complete discus
Attenuation describes the ratio between output and input level in decibel (dB).
In Auto Mode DEV devices e.g. redundancy switches can work fully autonomously without the need of a M&C-System.
Automatic Antenna Redundancy System
In a N+1 antenna configuration if the feed from a fixed antenna (N) fails, the DEV 1993 with option 30 will steer a motorised antenna (+1) to the appropriate satellite. After checking that the signals are within specification the signals from the motorise
Automatic Switch Back
In case of redundancy switching a device equipped with the Option "Automatic Switch Back" is able to switch back from backup to main port after the status of main recovers.
Back Channel Network
Back Channel Network is the 2-way communications link in cable networks. The end-user is able to send information, requests and/or demands back to the cable network operator.
Bit Error Rate or Bit Error Ratio (BER) is the number of bit errors divided by the total number of transferred bits during a certain time interval.
Bias Current Monitoring
With the bias monitoring functionality, the LNB bias current of each channel is monitored within a user adjustable threshold window.
Bias Tee or LNB Powering provides power to operate a LNB.
A switch that can pass signals in both forward and reverse directions.
A blocking matrix is built with switches on both the inputs and the outputs. Each input signal can be switched to only one output port at a time.
The BNC connector (Bayonet Neill–Concelman) is a miniature quick connect disconnect RF connector used for coaxial cable. It features two bayonet lugs on the female connector; mating is achieved with only a quarter turn of the coupling. Available in 50 or
The term broadband refers to the wide bandwidth characteristics for signal transmission.
Block up converter (BUC) converts a band of frequencies from a lower to a higher frequency.
C-Band designated for Satellite use is the band of frequencies from 3.7 to 4.2 GHz for downlinks, and the band of frequencies from 5.925 GHz to 6.425 GHz for uplinks. Polarisation can be Linear Vertical or Horizontal or Circular Left or Right handed.
A modulator-demodulator at the subscriber premises intended for use in conveying data communications on a cable television system.
Cable Modem Termination System (CMTS)
A device located at the cable television system headend or distribution hub, which provides complementary functionality to the cable modems to enable data connectivity to a wide-area network.
Carrier detect is the equivalent to RF Sensing but for video signals. It is used as a quality indicator to either just send an alarm to a M&C System or for instance to perform a redundancy switching fully autonomously.
Carrier to Noise Ratio (CNR)
The carrier-to-noise ratio (CNR) or C/N is defined as the ratio of the received modulated carrier signal power C to the received noise power N.
CATV (Community Antenna TeleVision) is the historic name for the frequency band from 10 ...1006 MHz (previously 47…862 MHz) incorporating the remaining analogue terrestrial TV, Cable TV and modulator IF frequencies.
Core Function Products (CFP) are streamlined to core functions, offering cost-savings while providing high quality in RF signal transmission.
Conditional Access (CA) Conditional access system (CAS) standards are defined in the Digital Video Broadcasting (DVB) standard for DVB-CA (conditional access system), DVB-CSA (the common scrambling algorithm) and DVB-CI (the Common Interface). These stand
Customer-premises equipment (CPE)
Customer-premises equipment (CPE) is any terminal and associated equipment located at a subscriber's premises and connected with carrier's telecommunication channel at the demarcation point.
"Coarse Wavelength Division Multiplexing (CWDM) combines multiple wavelengths, up to 16, (multiple signals) on a single fiber optic cable."
The Damage Level is the maximum input level at which the respective device takes damage.
A distributed antenna system (DAS), is a network of spatially separated antenna nodes connected to a common transport medium typically coax or fiber-optic cable that provides wireless service within an area, building or structure. DAS networks are mainly
Data Backup is part of the DEV Web Interface, that makes it possible to save and restore device or instrument data as well as error log information of DEV devices. The stored data can be accessed on the device itself (SD-Card) and can be exported to a con
dB is a logarithmic unit used to describe a ratio of power.
dBc - relative to the carrier - is the power ratio of the carrier level to noise level, expressed in decibels.
dBm (sometimes dBmW) is an abbreviation for the power ratio in decibels (dB) of the measured power referenced to one milliwatt (mW).
DC -48 Volts
In Telecom installations a DC -48 Volt power supply is used. This is normally a battery based system that is continuously float charged. This allows for continued provision of telecom circuits even when AC power is out during storms etc.
In- or outputs which are DC blocked prevent the flow of DC voltage while passing RF frequency.
Bidirectional RF switch that can select one of many ports to a single common port or a single port to one of many ports.
The DEV Desktop Modules belong to the OPTRIBUTION® series and are stand-alone modules for optical transmission. Due to the size the Desktop Modules are perfectly suited for space-limited applications and offer significant cost-savings.
Dig-In is a hardwired connection to a DEV device to control the switching state. Commonly used when no M&C system is available or practical. In the case of modulator redundancy the Dig-in monitors the logic levels on the equipments alarm or fail relays.
A diplexer is a passive device that implements frequency domain multiplexing. Two ports (e.g., L and H) are multiplexed onto a third port (e.g., S). The signals on ports L and H occupy disjoint frequency bands. Consequently, the signals on L and H can coe
A Distributing Matrix allows to connect one input to multiple outputs simultaneously.
Distribution Amplifiers are capable to split an input up to 128 outputs without loss or additional gain, typically offering additional features like LNB powering, tilt adjustment etc.
Data Over Cable Service Interface Specification (DOCSIS) is an international telecommunications standard that permits the addition of high-bandwidth data transfer to an existing cable TV (CATV) system. It is employed by many cable television operators to
Downstream, describe the transmission of an RF signal from headend or hub site to the subscriber.
Double pole, double throw (DPDT) consists to two switches (SPST - single pole, single throw) controlled by a single mechanism, sometimes named as Transfer Switch.
Double pole, single throw (DPST) is a simple changeover switch providing two in-/outputs switchable to a common port.
Relay contacts, either generally open or generally closed, connected hardwired to a M&C System providing the status of dedicated features or common device status.
The Digital Video Broadcasting (DVB) is an industry-led consortium of over 200 broadcasters, manufacturers, network operators, software developers, regulators and others from around the world committed to designing open interoperable technical standards f
Digital Video Broadcasting (DVB-C) is the DVB European consortium standard for the broadcast transmission of digital television over cable. This system transmits an MPEG-2 or MPEG-4 family digital audio/digital video stream, using a QAM modulation with ch
Digital Video Broadcasting (DVB-S) Satellite is the original DVB standard for Satellite Television and dates from 1995, in its first release, while development lasted from 1993 to 1997. The first commercial application was by Galaxy in Australia, enabling
Digital Video Broadcasting - Satellite - Second Generation (DVB-S2) is a digital television broadcast standard that has been designed as a successor for the popular DVB-S system. It was developed in 2003 by the DVB Project, an international industry conso
Digital Video Broadcasting (DVB-T) Terrestrial is the DVB European-based consortium standard for the broadcast transmission of digital terrestrial television that was first published in 1997 and first broadcast in the UK in 1998. This system transmits com
Digital Video Broadcasting (DVB-T2 ) Second Generation Terrestrial is the extension of the television standard DVB-T, issued by the consortium DVB, devised for the broadcast transmission of digital terrestrial television. DVB-T2 has been standardized by E
Digital Video Recorder (DVR), sometimes referred to by the merchandising term personal video recorder (PVR), is a consumer electronics device or application software that records video in a digital format to a disk drive. The term includes set-top boxes (
"Dense Wavelength Division Multiplexing (DWDM) combines multiple wavelengths, up to 80, (multiple signals) on a single fiber optic cable."
An E1 link operates over coaxial cable or a balanced pair. A nominal 3 volt peak to peak signal is encoded with pulses using a method avoiding long periods without polarity changes. The line data rate is 2.048 Mbit/s (full duplex). The CEPT originally sta
The E2000 HRL Connector is an optical connector 8° angled originally developed by a Swiss company Diamond using a push-pull mechanism. A special feature of the connector is its self-opening protective cap, which minimizes the risk of contamination of the
EDFA (Erbium-Doped Fiber Amplifier) is an optical device that amplifies an optical signal without converting it to electrical . EDFA's are commonly used in DWDM applications.
Ethernet E-O-E Converter
The Ethernet E-O-E Converter is a dual fiber optical Ethernet converter module for the transmission of the Ethernet connection via optical fibers.
The extended L-Band for DEV devices stands for the frequency range 700…2300 MHz.
The recommended F type connector is referred to as "precision F type connector" with a centre pin and crimped body. This type of connector has very good return loss up to 3 GHz. The basic F connector using the solid conductor of the coaxial cable as the c
Factory Acceptance Test (FAT) is an audit at DEV or at the customers premises to check and approve device or systems functionalities.
The FC/APC Connector is an optical connector 8° angled originally developed by a NTT using a screw connection. This connector is often used in military application.
Frequency Range is the bandwidth for which a device is designed and designated to be used for.
Fiber to the building (FTTB) is a type of fiber-optic cable installation where the fiber cable goes to a point on a shared property and provides the connection to single homes, offices or other spaces.
Fiber to the curb (FTTC) is an advanced hybrid fiber/copper network architecture that delivers increased broadband bandwidth capabilities beyond what traditional legacy copper networks offer. The hybrid fiber/copper architecture uses optical fiber infrast
Fiber to the Home (FTTH) is the installation and use of optical fiber directly to individual buildings such as single family units (SFUs), like residences, and multidwelling units (MDUs), like apartment buildings, and businesses to provide high-speed broa
Fiber to the x (FTTX) is a generic term for any broadband network architecture using optical fiber to provide all or part of the local loop used for last mile telecommunications. The term is a generalization for several configurations of fiber deployment,
Full Fan-in matrix allows for multiple simultaneous paths and allows inputs to share outputs. (Input signals are combined into a shared output).
Full Fan-Out (Distributing) matrix allows for multiple simultaneous paths and allows outputs to share inputs. (Output signals are split from a shared input)
Gain is defined as the ratio of the output power to the input power in dB. If a device provides gain the input signal will be amplified (gained) and thereof the output signal amplitude is typically higher than the one of the incoming signal.
Gain Stability over temperature
Specifies how stable (equal) the gain of a device is over a defined temperature range.
Group Delay Distortion
Group Delay Distortion is a measure of the time delay of a signal passing a device.
Hybrid Broadcast Broadband TV (HbbTV) is both an industry standard (ETSI TS 102 796) and promotional initiative for hybrid digital TV to harmonise the broadcast, IPTV, and broadband delivery of entertainment to the end consumer through connected TVs (smar
HD Serial digital interface (SDI) is a standardized video interface defined by SMPTE (The Society of Motion Picture and Television Engineers). A related standard HD-SDI provides a single 1.485 Gbit/s serial link for uncompressed signals. It is standardize
High Definition Televsion ( HDTV) is a high-quality video standard developed to replace older video formats often referred to as SDTV (standard definition television). While HDTV's video quality is one of the most noticeable improvements over SDTV, HDTV i
Hybrid fiber-coaxial (HFC) is a telecommunications industry term for a broadband network that combines optical fiber and coaxial cable.
High power amplifier, typically used after the BUC for high power amplification.
HSPA+, also known as Evolved High-Speed Packet Access, is a technical 3G standard for wireless communications. HSPA+ provides data rates to the end user that are comparable to LTE networks.
Impedance, expressed in Ohm, characterises an RF port. It is an important parameter when connecting different devices.
Impedance transformers are used to transform/convert one impedance over a wide bandwidth to another in order to connect devices with different impedances.
Input Dynamic Range
Dynamic range is the ratio between the largest and smallest possible input signal level in dB.
Insertion Loss (dB) is defined as the drop in signal power. In case of insertion loss the input signal will be attenuated. Consequently the output signal amplitude is lower than the one of the incoming signal.
Intermodulation Distortion (IMD) is the amplitude modulation of signals containing two or more different frequencies in a system with non-linearities. The intermodulation between each frequency component will form additional unwanted signals.
The Second Order Intercept Point (IP2) is a measure of linearity that quantifies the second-order distortion generated by nonlinear systems and devices.
The Third Order Intercept Point (IP3) is a measure of linearity that quantifies the third-order distortion generated by nonlinear systems and devices.
Internet Protocol television (IPTV) is a system through which television services are delivered using the Internet protocol suite over a packet-switched network such as a LAN or the Internet, instead of being delivered through traditional terrestrial, sat
IRD Controlled Switch
The required polarization can be selected using the bias voltage generated in the IRD 13 Volts = Vertical and 18 Volts = Horizontal. To select the required band the 22 KHz tone can control the switching. Low = Tone off or High = Tone On. The DEV IRD contr
Isolation between two inputs.
Isolation between two switched paths, traditionally called crosstalk.
Ratio between Insertion Loss/Gain of Measurement 1 and Insertion Loss of Measurement 2.
Isolation between two outputs.
Jitter is the undesired deviation from true periodicity of an assumed periodic signal in electronics and telecommunications, often in relation to a reference clock source.
Ka-Band stands for the frequency range 26.5–40 GHz.
Ku-Band is primarily used in satellite communications with the frequency range between 10,7 GHz and 17,5 GHz. The Ku-Band uplink being between 14 GHz and 17,5 GHz and the downlink between 10,7 GHz to 12,75 GHz.
L-Band stands for the frequency range 950...2150 MHz.
A latching relay is a relay which stays in the switched position even in case of power outage.
The Leitch protocol provides a standard for the communication between the device and a host over serial as well as over Ethernet connection.
Lightning Protection, at DEV built with gas capsules, can protect equipment being damaged due to a lightning. A proper grounding of all outdoor equipment, buildings etc. is as well mandatory to enhance security against lightning.
Link Gain specifies the gain/loss of an optical link from the input of the Tx-Module to the output of the Rx-Module measured with 1 m optical path cable (~0,5 dB optical loss).
A low-noise block down converter (LNB) is the receiving device mounted on satellite dishes used for satellite TV reception, which collects the radio waves from the dish. It receives the microwave signal from the satellite collected by the dish, amplifies
See LNB Power.
LNB Power is the voltage and current to be fed to a LNB to operate the LNB.
In Local Mode the DEV devices are to be controlled via the buttons from the front panel or via the DEV Web Interface.
Abbreviation for Long-Term Evolution a standard for wireless communications at high data rates. The standard has been developed by the 3GPP (3rd Generation Partnership Project) in Release 8 and 9. Although LTE is usually marketed as a 4G standard, technic
A Monitoring & Control System is an almost software-based system providing monitoring and control ability of vendor independent equipment e.g. in head end stations.
Other than traditionally it is the case for redundancy switches were In A is dedicated being the main input and In B the backup input, the functionality Main/Backup Swap changes dynamically the role of main and backup channel. After redundancy switching f
Managed L-Band Distribution
Managed L-Band Distribution stands for a chassis which contains multiple L-Band distribution amplifiers of various fixed splitting ratios or switching scenarios e.g. matrix switch or RF matrix. As a standard all distribution amplifiers use RF-Sensing tech
Managed Power Supply
A Managed Power Supply is high power power supply to supply for instance a CMTS with DC power fully manageable via SNMP protocol.
The modulation error ratio (MER) is a measure used to quantify the performance of a digital radio transmitter or receiver in a communication system using digital modulation.
MGC (Manual Gain Control) is used to manually adjust the gain.
MIMO (Multiple Input Multiple Output) describes the transmission and reception of multiple data streams from one device using multiple antenna elements on the same radio channel.
A Monitoring Port is an additional RF port providing the same or less signal level as e.g. at the appropriated in- or output.
Multiplex MPEG transport stream (MPEG-TS, MTS or TS) is a standard container format for transmission and storage of audio, video, and Program and System Information Protocol (PSIP) data. It is used in broadcast systems such as DVB, ATSC and IPTV.
N+1 redundancy ensures system availability in the event of a failure in one of the main paths. N main paths have at least one backup path (+1).
Named after Paul Neill of Bell Labs after being developed in the 1940's, the Type N offered the first true microwave performance. The Type N connector was developed to satisfy the need for a durable, weatherproof, medium-size RF connector with consistent
Next Generation Network
Next-generation network (NGN) is a body of key architectural changes in telecommunication core and access networks. The general idea behind the NGN is that one network transports all information and services (voice, data, and all sorts of media such as vi
The noise factor is defined as the ratio of the output noise power of a device to the portion thereof attributable to thermal noise in the input termination at standard noise temperature T0 (usually 290 K). The noise factor is thus the ratio of actual out
Noise figure (NF) is a measure of degradation of the signal to noise ratio (S/N), caused by components in a radio frequency signal chain. It is a number by which the performance of a radio receiver or system can be specified. The noise figure is simply th
Nominal Input Level
A nominal signal level at the input is the recommended accumulated level to ensure the best performance. It is expressed in decibels.
A non-blocking cross-point matrix is designed to allow one input or output to be connected to multiple inputs or outputs simultaneously.
Orthogonal frequency division multiplexing (OFDM) scheme used as a digital multi-carrier modulation method. A large number of closely spaced orthogonal sub-carrier signals are used to carry data on several parallel data streams or channels.
Optical modulation index - is key variable in determining carrier power and thus Carrier-to-Noise Ratio (CNR), which is a primary factor in the performance of optical communications systems.
The component’s 1 dB output compression point in dBm, and defined as the output level that is 1 dB lower than it should be for a corresponding input level in linear operation. The output and input 1 dB compression points are related by OP1dB = IP1dB + Gai
The optical power budget in a fiber-optic communication link is the maximum acceptable optical loss between Tx- and Rx-Module.
Optical Path Redundancy
See N+1 Redundancy.
Optical Receivers are modules to receive an optical signal and convert it into an electrical one.
Optical Splitters distribute one optical signal to up to 8 outputs.
Optical Transmitters are modules to convert an electrical signal to optical and transmit it via an optical fiber.
OPTRIBUTION® is a registered trademark of DEV Systemtechnik and comprises RF signal transmission products for the "Optical Transmission and Distribution of RF Signals“. The product family covers transmission from RF to optical and from optical to RF betwe
Passive Combiners are capable to combine up to 32 signals without compensating loss.
Passive Splittears are capable to split an input up to 32 outputs without compensating loss.
A Patch Panel is an assembly of coaxial adapters to connect RF cables to provide the possibility of easy recabling of parts of a system.
Plain Old Telephone Service (POTS) is voice-grade telephone service employing analog signal transmission over copper loops. POTS was the standard service offering from telephone companies from 1876 until 1988 when the now-obsolete Integrated Services Digi
Power Line Redundancy
Power line redundancy is the duplication of the power line as a critical component or function of the system to increase reliability of the system, usually in the case of a backup or fail-safe. DEV provides power line redundancy out of two phases in most
Power Supply Redundancy
Power supply redundancy is the duplication or even triplication of the power supply as a critical component or function of the system with the intention of increasing reliability of the system, usually in the case of a backup or fail-safe. In case of no f
The PROSAN protocol provides a standard for the communication between the device and a host over serial connection.
Quadrature amplitude modulation (QAM) can be both an analog or a digital modulation scheme. It conveys two analog message signals, or two digital bit streams, by changing (modulating) the amplitudes of two carrier waves, using the amplitude-shift keying (
Switch for providing redundancy switching for example: 1+1 switching from main to backup device. N+1 switching from many main to a single backup device. N+M switching from many main to multiple backup devices.
The Redundant Amplifiers ensure continuous operation in RF transmission applications to avoid signal loss if one amplifier fails. It is the consequent approach for "no single point of failure" having all active RF or digital componets redundant on a modul
A remote control is a functionality which allows the user to interact between the devices without touching them. This can be done via a remote protocol e.g. SNMP or Leitch.
Remote Mode is an operation mode which is controlled remotely i.e. from another place possibly far away from the system which is operated. This can be done via a remote protocol e.g. SNMP or Leitch
Return Loss (dB) is defined as a ratio of the incoming signal to the same reflected signal at a discontinuity.
Return Path Network
See Back Channel Network.
RF Matrix Switch
An RF Matrix Switch allows the flexible routing of RF signals at the Input to selected output ports. Different types of RF Matrices , like ditributing, combining, blocking or non-blocking exist.
RF over Fiber
RF over Fiber solutions convert analog RF signals into optical which are then transmitted over optical fibers and converted back to RF at various frequency bands.
RF over Fiber
RF over Fiber solutions convert analog RF signals into optical which are then transmitted over optical fibers and converted back to RF at various frequency bands.
RF Sensing measures the accumulated RF power over the entire bandwidth. This value is a quality indication to either just send an alarm to a M&C System or to perform a redundancy switching fully autonomously.
RF Signal Recording
RF Signal Recording is able to record the results of RF Sensing and LNB Bias Current Monitoring in user-defined time intervals.
Switch intended to switch RF signals transported on coaxial cables with minimum insertion loss.
RF threshold is a predefined configurable level within the RF Sensing functionality. If the RF Sensing value falls below the adjusted threshold either an alarm will be sent to a M&C System or a redundancy switching will be initiated fully autonomously.
The SC/APC Connector is an optical connector 8° angled originally developed by a NTT using a push-pull mechanism.
A Seamless Switch is a 1+1 automatic redundancy for ASI/SDI signals for uninterrupted signal transmission.
A Sensing Switch is a DPST switch using the RF Sensing functionality for automatic switchover in case of signal loss.
A Serial Interface is mostly a Sub-D connector providing an interface for remote communication via a protocol.
SMA (Sub Miniature version A) connectors are semi-precision coaxial RF connectors miniature connector interface for coaxial cable with a screw type coupling mechanism. The connector has a 50 Ω impedance. It is designed for use from DC to 18 GHz.
Smart TV, sometimes referred to as connected TV or hybrid TV, is a television set or set-top box with integrated Internet and Web 2.0 features, and is an example of technological convergence between computers and television sets and set-top boxes.
Simple Network Management Protocol (SNMP) is a remote protocol used for managing devices in M&C Systems.
Spurious Free Dynamic Range (SFDR)
Spurious-Free Dynamic Range (SFDR) is the strength ratio of the fundamental signal to the strongest spurious signal in the output.
Summary alarm indicates if any failure in a device occurs.
Threshold Level Accuracy
Threshold Level Accuracy is an indicator for the precision of a RF Sensing measurement.
Threshold Repeatability indicates how precise repeated measurement results can be achieved under unchanged conditions.
The TNC connector (Threaded Neill-Concelman) is similar to the BNC connector but is threaded for a more secure connection. It has superior performance to the BNC connector at microwave frequencies.
Trap Receiver Action Controller (TRAC) is the ability of a switching device to be controlled directly by SNMP Traps of vendor independent equipment without the need for a M&C System.
Transfer switch has 4 coaxial ports as 2 inputs and 2 outputs. In normal operation input 1 is connected to output 1 etc. when switched the output ports are reversed (transferred). It provides exceptional repeatability, low insertion loss, and high isolati
TripleC Protection is DEVs free service package for 37 months and stands for Competent and Complete Care.
Universal Mobile Telecommunications System (UMTS) is a third generation mobile cellular system for networks based on the GSM standard. Developed and maintained by the 3GPP (3rd Generation Partnership Project), UMTS is a component of the International Tele
Upstream, describe the transmission of an RF signal from the subscriber to the headend or hub site.
Variable Gain is adjustable amplification for active devices in a specified range.
Variable Tilt compensates frequency dependent loss of coaxial cables in customer systems.
Very-high-bit-rate digital subscriber line 2 (VDSL2) is an access technology that exploits the existing infrastructure of copper wires that were originally deployed for traditional telephone service as a way of delivering high speed internet access. The m
Video On Demand (VOD) is a system that allows users to select and watch/listen to video or audio content when they choose to, rather than having to watch at a specific broadcast time.
Voice over IP (VoIP) is a methodology and group of technologies for the delivery of voice communications and multimedia sessions over Internet Protocol (IP) networks, such as the Internet.
Virtual Private Network (VPN) extends a private network across a public network, such as the Internet. It enables a computer or network-enabled device to send and receive data across shared or public networks as if it were directly connected to the privat
Voltage Standing Wave Ratio (VSWR) can be calculated out of the return loss specification as follows:
Wavelength is the distance between identical points in the adjacent cycles of a waveform signal propagated in space or along a wire. Can be calculated as Lambda λ = v / ƒ, were v is velocity and f is frequency.
The DEV Web Interface is an enhanced graphical user interface (GUI) to monitor and control all functions, features and settings available for DEV devices. Simultaneous access of an unlimited number of users is possible.
The term WiFi is widely used to describe a Wireless Local Area Network (WLAN) that allows mobile devices to communicate on unlicensed frequency spectrum .
WiMAX represetns an abrreviaton for Worldwide Interoperability for Microwave Access an is a set of wireless communications standards for mobile braodband conectivity. WiMAX is based on the IEEE 802.16 standard.
For military communications satellites, the ITU has assigned the X band uplink frequency band as from 7.9 to 8.4 GHz. The ITU-assigned downlink frequency band is from 7.25 to 7.75 GHz.