Sec.  15.611   General technical requirements.

   

   (a) Conducted emission limits. Access BPL is not subject to the
   conducted emission limits of Sec. 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 Sec. 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 Sec. 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 Sec. 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 20 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.

   (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.