What is carrier signal? - Definition from Whatis.com

A carrier signal is a transmitted electromagnetic pulse or wave at a steady base frequency of alternation on which information can be imposed by increasing signal strength, varying the base frequency, varying the wave phase, or other means. This variation is called modulation. With the advent of laser transmission over optical fiber media, a carrier can also be a laser-generated light beam on which information is imposed.

Types of analog modulation of a carrier include amplitude modulation (AM), frequency modulation (FM), and phase modulation. Types of digital modulation include varieties of pulse code modulation (PCM), including pulse amplitude modulation (PAM), pulse duration modulation (PDM), and pulse position modulation (PPM).

This was last updated in July 2007
Editorial Director: Margaret Rouse

Dig Deeper

  • Deep Packet Inspection primer

    This deep packet inspection primer looks at how network operators use DPI for traffic management and analysis, and how net neutrality principles have made its use controversial.

  • ISP simplifies acquisition consolidation with network discovery tool

    A wholesale ISP that has grown by acquisition has deployed a network discovery tool to simplify network mapping for its hodgepodge of inherited network devices.

  • Telecom tutorials

    SearchTelecom.com's tutorials offer expert insight, technical tips and best practices on core and access networks, IPTV, fixed mobile convergence, VoIP, WiFi/WiMax, wireless and mobile devices, MPLS, service areas, network operations and more.

Do you have something to add to this definition? Let us know.

Send your comments to techterms@whatis.com
Back to top