Home' RTCA Documents for Review : DO-262D Contents 13
© RTCA, 2018
Burst Output Power: For satellite systems using TDMA format, the transmitter power
output is be defined as the average power over any single TDMA timeslot with the
maximum data and voice carriers declared by the manufacturer active at their
maximum output power in the same timeslot. The transmitter power output is defined
with respect to a single TDMA timeslot, not a TDMA frame. If a carrier is active for
more than a single timeslot in the frame, the combined duration of all active timeslots
is used. For satellite systems using a CDMA format the power output is the average
power over the length of the CDMA code, measured with the all voice and data
channels active. For simple FDMA system in which the channel bandwidth is
dedicated to a single user, the average shall be over one second.
Circuit Mode Data: Binary Data, such as facsimile and personal computer modem,
which is transferred via a dedicated point-to-point connection or circuit between the
local (airborne) and remote users. For the purposes of this document, Circuit Mode
Data refers to the methods used for satellite subnetwork access, not necessarily to the
internal data communications processes within the specific sub-network.
Code Division Multiple Access (CDMA): A technique for multiplexing many users
onto the same RF carrier in which each user is assigned a unique pseudo-random
code that is uncorrelated with all other user codes. The pseudo-random code is used
in a direct sequence spread spectrum manner, with the result that undesired users are
rejected by the receiver correlation function.
Frequency Division Multiple Access (FDMA): A technique for multiplexing several
users within the same RF bandwidth by assigning each user a unique sub-band of the
designated transmit and receive frequency bands. FDMA techniques may be
combined with either TDMA or CDMA techniques to increase the re-use of available
Left-Hand Circular Polarization (LHCP): An elliptically or circularly polarized wave in
which the electric field vector, observed in a fixed plane that is normal to the direction
of propagation while looking in the direction of propagation, rotates with time in a left-
hand or counter-clockwise direction (ITU-R definition).
Multi Carrier: A descriptive term applying to AES equipment that is capable of
generating or receiving multiple radio frequency carriers at the same time.
Multi Channel: A descriptive term applying to AES equipment that is capable of
communicating multiple voice and/or data channels simultaneously. Depending on
the specifics of the signal format, an AES may be capable of offering multi-channel
service without having multi-carrier capability.
Next Generation Satellite System (NGSS): A satellite communications system that
provides AMS(R)S which may be voice, data or both. An NGSS includes AESs,
satellites, GESs and network control system facilities that perform administrative and
operational management functions.
An NGSS may provide non-AMS(R)S
Packet Mode Data: Binary Data that is transmitted by transferring independent units
of information over the subnetwork interface. In general, Packet Mode Data will utilize
either Data 2 or Data 3 protocols defined in this document, and may utilize a
technique-specific Air-Ground Protocol (AGP) sublayer within the Satellite Subnetwork
Dependent Protocol (SSNDP). For the purposes of this document, Packet Mode Data
refers to the methods used for satellite subnetwork access, not necessarily to the
internal data communications processes used within the specific sub-network.
Residual Packet Error Rate: The likelihood that a particular packet will be duplicated
or delivered incorrectly. An incorrectly delivered packet is one in which the user data
is delivered to the satellite subnetwork interface with one or more bit errors or the user
data is delivered to an incorrect higher level entity. See DO-215A, Change 1, for
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