April 2007

  • What causes my overseas VPN connection to slow during the day?

    Learn what slows connectivity for a VPN overseas during particular times of day, in this Q&A with VPN expert Sampath Ramaswami.20 Apr 2007

  • Are there any architectures of IPsec VPN apart from lookaside and flow-through?

    In an IPsec VPN, learn what architectures exist apart from lookaside and flow-through, in this expert response from Sampath Ramaswami.20 Apr 2007

  • What equipment do I use to connect two LANs in different cities? What are the steps?

    How do you connect two LANS from different cities? VPN expert Sampath Ramaswami notes the steps to be taken, in this Q&A.20 Apr 2007

  • Why has the terminal server ended my connection?

    Find out reasons a terminal server might end a connection, in this Q&A with Chris Partsenidis.18 Apr 2007

  • logical router

    A logical router is a configured partition of a traditional network hardware, or "physical," router.18 Apr 2007

  • Certified Wireless Networking Professional (CWNP)

    Certified Wireless Networking Professional (CWNP)is the name for the family of wireless certifications from Planet3Wireless.18 Apr 2007

  • infrared radiation (IR)

    Infrared radiation (IR) or the term infrared alone refers to energy in the region of the electromagnetic radiation spectrum at wavelengths longer than those of visible light,but shorter than those ...18 Apr 2007

  • telematics

    Telematics is the blending of computers and wireless telecommunications technologies, ostensibly with the goal of efficiently conveying information over vast networks to improve a host of business ...18 Apr 2007

  • phase-locked loop (PLL)

    A phase-locked loop (PLL) is an electronic circuit with a voltage- or current-driven oscillator that is constantly adjusted to match in phase (and thus lock on) the frequency of an input signal.18 Apr 2007

  • CDPD (Cellular Digital Packet Data)

    CDPD (Cellular Digital Packet Data) is a specification for supporting wireless access to the Internet and other public packet-switched networks.18 Apr 2007

  • USSD (Unstructured Supplementary Service Data)

    USSD (Unstructured Supplementary Service Data) is a Global System for Mobile(GSM) communication technology that is used to send text between a mobile phone and an application program in the network.18 Apr 2007

  • frequency-hopping spread spectrum

    Frequency hopping is one of two basic modulation techniques used in spread spectrum signal transmission.18 Apr 2007

  • UHF (ultrahigh frequency)

    The UHF (ultrahigh frequency) range of the radio spectrum is the band extending from 300 MHz to 3 GHz.18 Apr 2007

  • VHF (very high frequency)

    The VHF (very high frequency) range of the radio spectrum is the band extending from 30 MHz to 300 MHz.18 Apr 2007

  • infrared transmission

    Infrared transmission refers to energy in the region of the electromagnetic radiation spectrum at wavelength s longer than those of visible light, but shorter than those of radio18 Apr 2007

  • iDEN (Integrated Digital Enhanced Network)

    iDEN (Integrated Digital Enhanced Network) is a wireless technology from Motorola combining the capabilities of a digital cellular telephone, two-way radio, alphanumeric pager and data/fax modem in...18 Apr 2007

  • GTAG (Global Tag)

    GTAG (Global Tag) is a standardization initiative of the Uniform Code Council (UCC) and the European Article Numbering Association (EAN) for asset tracking and logistics based on radio frequency id...18 Apr 2007

  • CTI (computer-telephony integration)

    CTI (computer-telephony integration), or sometimes simply "computer telephony," is the use of computers to manage telephone calls.18 Apr 2007

  • SIGTRAN (Signaling Transport)

    SIGTRAN (for Signaling Transport) is the standard telephony protocol used to transport Signaling System 7 (SS7) signals over the Internet.18 Apr 2007

  • virtual area network (VAN)

    A virtual area network (VAN) is a network on which users are enabled to share a more visual sense of community through high band-width connections.18 Apr 2007