Goto Section: 25.286 | 25.288 | Table of Contents
FCC 25.287
Revised as of September 1, 2021
Goto Year:2020 |
2022
§ 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]
Goto Section: 25.286 | 25.288
Goto Year: 2020 |
2022
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