Skip Navigation

Federal Communications Commission

English Display Options

Commission Document

OET and Media Bureau Announces the Special Webpage Facility for CDBS

Download Options

Released: May 29, 2013

Federal Communications Commission

News Media Information 202 / 418-0500
445 12th St., S.W.
Fax-On-Demand 202 / 418-2830

Washington, D.C. 20554

TTY 202 / 418-2555

DA 13-1221

Released: May 29, 2013

The Office of Engineering and Technology and the Media Bureau Announce the Availability of a

Special Webpage Facility for Update of TV Translator, Low Power TV and Class A Station Input

Channels in the CDBS

As part of their efforts towards implementing the rules for operation of unlicensed devices on
unused spectrum in the broadcast television frequency bands (TV white spaces), the Commission’s Office
of Engineering and Technology (OET) and Media Bureau (MB) have developed a special webpage
facility (webapp) where TV translator, low power TV and Class A TV stations (low power stations) can
quickly and easily update their input channel data in the Media Bureau’s Consolidated Database System
(CDBS). This facility is especially important for low power stations that are located outside of the service
contours of the station(s) that they re-transmit. The new input channel update facility is available at
TV translators and many low power TV and Class A TV stations provide simultaneous
re-transmission of the program service of full power TV stations. These stations typically receive this
programming service over-the-air from the originating station’s broadcast signal (or in some cases the
signal of another low power station) and then re-transmit that programming on their own channel.
The Commission’s rules generally provide for protection of TV signals received over-the-air by a
low power station and used as part of that station's service (input channels) from interference caused by
unlicensed TV white space (TVWS) devices. This protection is provided through TVWS database
systems, which are accessed by TVWS devices to obtain lists of channels that are available for operation.
The TVWS database systems provide protection based on records drawn from the CDBS.
Low power stations that are located outside of the originating station’s service contour but within
80 kilometers of those station’s contours are protected by preventing TVWS devices from operating on
their input channels in the vicinity of the receive site. This protection is provided for the input channels
recorded in the CDBS records of the low power station. If the low power TV station is located within the
service contour of the full power station (or other originating station), its input channels are protected by
the rules prohibiting operation of TVWS devices within the service contours of the full- and low-power
TV stations. The input channels of low power stations located more than 80 km from the service contours
of the full service stations transmitting those channels are not protected unless the Commission has
granted a waiver.
During the digital television transition that ended on June 12, 2009, many full power stations
changed their operating channels. Low power stations re-transmitting such stations have had to make
corresponding changes to their equipment. A significant number of those low power stations have not
updated their input channels in the CDBS. The input channels of low power stations falling into this

category can only be protected if they are properly recorded in the CDBS. It is therefore essential that
these stations review their CDBS records regarding input channels and provide corrections and updates as
The new webpage facility that OET and MB are announcing herein will provide licensees of low
power stations with a simple and efficient utility for updating their input channel information in the
CDBS. There is no fee for low power stations to update their input channels.
Questions regarding this Public Notice may be directed to Alan Stillwell at (202) 418-2470, Hugh
L. Van Tuyl at (202) 418-7506 or Hossein Hashemzadeh at (202) 418-1658.
By the Chief, Office of Engineering and Technology and Chief, Media Bureau.

Note: We are currently transitioning our documents into web compatible formats for easier reading. We have done our best to supply this content to you in a presentable form, but there may be some formatting issues while we improve the technology. The original version of the document is available as a PDF, Word Document, or as plain text.


You are leaving the FCC website

You are about to leave the FCC website and visit a third-party, non-governmental website that the FCC does not maintain or control. The FCC does not endorse any product or service, and is not responsible for, nor can it guarantee the validity or timeliness of the content on the page you are about to visit. Additionally, the privacy policies of this third-party page may differ from those of the FCC.