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Out-Of-Band Signaling
  • The transmission of signaling via a different channel (either FDM or TDM) from that used for the primary information transfer.
  • Signals using a portion of the channel bandwidth provided by the medium such as the carrier channel, but denied to the speech or intelligence path by filters.
  • Note: This results in a reduction of the effective available bandwidth. See also bandwidth, channel, channel-associated signaling, common-channel signaling, frequency, in-band signaling, retrieval, signal.