§  15.611   General technical requirements.

   (a) Conducted emission limits. Access BPL is not subject to the
   conducted emission limits of §  15.107.

   (b) Radiated emission limits —(1) Medium voltage power lines. (i)
   Access BPL systems that operate in the frequency range of 1.705 kHz to
   30 MHz over medium voltage power lines shall comply with the radiated
   emission limits for intentional radiators provided in §  15.209.

   (ii) Access BPL systems that operate in the frequency range above 30
   MHz over medium voltage power lines shall comply with the radiated
   emission limits provided in §  15.109(b).

   (2) Low voltage power lines. Access BPL systems that operate over
   low-voltage power lines, including those that operate over low-voltage
   lines that are connected to the in-building wiring, shall comply with
   the radiated emission limits provided in §  15.109(a) and (e).

   (c) Interference Mitigation and Avoidance. (1) Access BPL systems shall
   incorporate adaptive interference mitigation techniques to remotely
   reduce power and adjust operating frequencies, in order to avoid
   site-specific, local use of the same spectrum by licensed services.
   These techniques may include adaptive or “notch” filtering, or complete
   avoidance of frequencies, or bands of frequencies, locally used by
   licensed radio operations.

   (i) For frequencies below 30 MHz, when a notch filter is used to avoid
   interference to a specific frequency band, the Access BPL system shall
   be capable of attenuating emissions within that band to a level at
   least 25 dB below the applicable Part 15 limits.

   (ii) For frequencies above 30 MHz, when a notch filter is used to avoid
   interference to a specific frequency band, the Access BPL system shall
   be capable of attenuating emissions within that band to a level at
   least 10 dB below the applicable part 15 limits.

   (iii) At locations where an Access BPL operator attenuates radiated
   emissions from its operations in accordance with the above required
   capabilities, we will not require that operator to take further actions
   to resolve complaints of harmful interference to mobile operations.

   (2) Access BPL systems shall comply with applicable radiated emission
   limits upon power-up following a fault condition, or during a start-up
   operation after a shut-off procedure, by the use of a non-volatile
   memory, or some other method, to immediately restore previous settings
   with programmed notches and excluded bands, to avoid time delay caused
   by the need for manual re-programming during which protected services
   may be vulnerable.

   (3) Access BPL systems shall incorporate a remote-controllable
   shut-down feature to deactivate, from a central location, any unit
   found to cause harmful interference, if other interference mitigation
   techniques do not resolve the interference problem.

   [ 70 FR 1374 , Jan. 7, 2005, as amended at  71 FR 49379 , Aug. 23, 2006;  76 FR 71908 , Nov. 21, 2011]

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