§  25.287   Requirements pertaining to operation of mobile stations in the
NVNG, 1.5/1.6 GHz, 1.6/2.4 GHz, and 2 GHz Mobile-Satellite Service bands.

   (a) Any mobile earth station (MES) operating in the 1530-1544 MHz and
   1626.5-1645.5 MHz bands must have the following minimum set of
   capabilities to ensure compliance with Footnote 5.353A in 47 CFR 2.106
   and the priority and real-time preemption requirements imposed by
   Footnote US315.

   (1) All MES transmissions must have a priority assigned to them that
   preserves the priority and preemptive access given to maritime distress
   and safety communications sharing the band.

   (2) Each MES with a requirement to handle maritime distress and safety
   data communications must be capable of either:

   (i) Recognizing message and call priority identification when
   transmitted from its associated Land Earth Station (LES), or

   (ii) Accepting message and call priority identification embedded in the
   message or call when transmitted from its associated LES and passing
   the identification to shipboard data message processing equipment.

   (3) Each MES must be assigned a unique terminal identification number
   that will be transmitted upon any attempt to gain access to a system.

   (4) After an MES has gained access to a system, the mobile terminal
   must be under control of an LES and must obtain all channel assignments
   from it.

   (5) All MESs that do not continuously monitor a separate signaling
   channel or signaling within the communications channel must monitor the
   signaling channel at the end of each transmission.

   (6) Each MES must automatically inhibit its transmissions if it is not
   correctly receiving separate signaling channel or signaling within the
   communications channel from its associated LES.

   (7) Each MES must automatically inhibit its transmissions on any or all
   channels upon receiving a channel-shut-off command on a signaling or
   communications channel it is receiving from its associated LES.

   (8) Each MES with a requirement to handle maritime distress and safety
   communications must have the capability within the station to
   automatically preempt lower precedence traffic.

   (b) Any LES for an MSS system operating in the 1530-1544 MHz and
   1626.5-1645.5 MHz bands must have the following minimum set of
   capabilities to ensure compliance with Footnotes 5.353A and the
   priority and real-time preemption requirements imposed by Footnote
   US315. An LES fulfilling these requirements must not have any
   additional priority with respect to FSS stations operating with other
   systems.

   (1) LES transmissions to MESs must have a priority assigned to them
   that preserves the priority and preemptive access given to maritime
   distress and safety communications pursuant to paragraph (a) of this
   section.

   (2) The LES must recognize the priority of calls to and from MESs and
   make channel assignments taking into account the priority access that
   is given to maritime distress and safety communications.

   (3) The LES must be capable of receiving the MES identification number
   when transmitted and verifying that it is an authorized user of the
   system to prohibit unauthorized access.

   (4) The LES must be capable of transmitting channel assignment commands
   to the MESs.

   (5) The communications channels used between the LES and the MES shall
   have provision for signaling within the voice/data channel, for an MES
   that does not continuously monitor the LES signaling channel during a
   call.

   (6) The LES must transmit periodic control signals to MESs that do not
   continuously monitor the LES signaling channel.

   (7) The LES must automatically inhibit transmissions to an MES to which
   it is not transmitting in a signaling channel or signaling within the
   communications channel.

   (8) The LES must be capable of transmitting channel-shut-off commands
   to MESs on signaling or communications channels.

   (9) Each LES must be capable of interrupting, and if necessary,
   preempting ongoing routine traffic from an MES in order to complete a
   maritime distress, urgency or safety call to that MES.

   (10) Each LES must be capable of automatically turning off one or more
   of its associated channels in order to complete a maritime distress,
   urgency or safety call.

   (c) No person without an FCC license for such operation may transmit to
   a space station in the NVNG, 1.5/1.6 GHz, 1.6/2.4 GHz, or 2 GHz
   Mobile-Satellite Service from anywhere in the United States except to
   receive service from the holder of a pertinent FCC blanket license or
   from another party with the permission of such a blanket licensee.

   [ 79 FR 8326 , Feb. 12, 2014, as amended at  84 FR 53659 , Oct. 8, 2019]