§ 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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