Sign up for Bridgewave's Quarterly Newsletter
Home > Glossary


  • AdaptPath™

    A BridgeWave (patents pending) technology that creates an all-weather, dual-path data connection by pairing a primary path BridgeWave 60 GHz or 80 GHz GigE wireless bridge with a lower speed, highly rain-tolerant secondary path. The resulting dual technology solution allows gigabit links to be deployed over unprecedented link distances, while maintaining up to 99.999% service availability.

  • AdaptRate™

    A BridgeWave (patents pending) technology that enables Gigabit RF links to automatically shift data rates from full-duplex GigE to 100Mbps, to overcome periods of severe cloudburst downpours. Once the downpours subside, the links seamlessly switch back to full GigE capacity.

  • Availability

    The availability of a communications link is the amount of time that the link is percentage of time that the link is performing to the level required by the application. Availability is often expressed as a percentage or as “x nines”, where “2 nines” equals 99%, “3 nines” equals 99.9%, “4 nines” equals 99.99% and so on. Applications dictate the level of availability required of a communications link. Whereas 99.9% availability means that a link is unavailable no more than around 9 hours a year, 99.999% availability means that a link is unavailable no more than around 5 minutes per year. Generally, only critical core network connections shared by many users require 99.999% availability, while other critical intermediate nodes may be able to accept 99.99%. Most office applications can easily accept 99.9% availability, since few network server configurations are designed to even provide this level of application availability. For millimeter-wave links, availability in a given geographic area is directly determined by link path distance.

  • Bandwidth

    Bandwidth is a measure of frequency range and is typically measured in hertz. Bandwidth is a central concept in many fields, including information theory, radio communications, signal processing, and spectroscopy. Bandwidth also refers to data rates when communicating over certain media or devices.

  • Bit Error Rate (BER)

    BER is a measure of the number of bits that are received in error divided by the total number of bits transmitted. BER is often expressed at 10-X meaning that there is one bit received in error for every 10X bits transmitted. Acceptable BERs vary by application. For general Internet web browsing, BERs of better than 10-7 are generally desireable. For VoIP or VPN services, BERs of better than 10-8 are typically desireable. Note that an Ethernet link with 10-8 BER will typically result in Ethernet packet losses of 0.1% or less.

  • Decibel (dB)

    A ratio of powers expressed as ten times the log of the ratio. For the non-engineer, 1dB more power is a factor of about one-quarter more. 1dB less power is about one-fifth less power. 3dB more is about two times more. 6dB more is about four times more. 10dB more is exactly 10 times more. 20dB more is exactly 100 times more. Adding figures in dB together is the same as multiplying the factors together - for example, 13dB (which is 10dB + 3dB) is a factor of 10 (10dB) times a factor of 2 (3dB), or 20 times more power.

  • Full-duplex

    Allowing data to be transmitted and received at the same time.

  • Forward Error Correction (FEC)

    A technique whereby redundant information is added to a transmitted data stream such the errors that occur in the received data stream can usually be detected and corrected without negative impact on the application. The use of FEC allows millimeter-wave links to be more resilient to data errors caused by severe rain downpours, improving link BER and availability and/or allowing the link to operate over a greater distance than without FEC.

  • Gigabit

    A gigabit is a unit of information or computer storage, abbreviated Gbit or sometimes Gb.

    1 gigabit = 109 = 1,000,000,000 bits (which is equal to 125 decimal megabytes).

  • HALT

    Highly Accelerated Life Testing. This is a technique designed to improve product designs such that they can reliably operate throughout varying operating conditions. Products are exposed to very rapid temperature cycling while being subjected to intense vibrations and are driven to the point of failure. Failures are analyzed, design changes are implemented to harden the product and the cycle is repeated until product reliability objectives are achieved.

  • HASS

    Highly Accelerated Stress Screening. This is a technique for reducing premature product failures in the field. Products are subjected to a scaled-back version of the HALT test (above) in order to uncover and negative variations in manufacturing workmanship or component quality that could otherwise result in field failures.

  • Millimeter Wave or Extremely High Frequency (EHF)

    This highest of radio frequency bands runs the range of frequencies from 30 to 300 gigahertz, above which electromagnetic radiation is considered to be low (or far) infrared light, also referred to as terahertz radiation. This band has a wavelength of ten to one millimeter, giving it the name millimeter band or millimeter wave.