UHP SCPC MODEM
USER MANUAL, v3.2
© ROMANTIS 2015 5 www.uhp.net
ACRONYMS AND ABBREVIATIONS
16 Amplitude and Phase-shift keying or Asymmetric Phase-shift keying, (APSK), is a digital modulation scheme that conveys
data by changing, or modulating, both the amplitude and the phase of a reference signal (the carrier wave).
32 Amplitude and Phase-shift keying or Asymmetric Phase-shift keying, (APSK), is a digital modulation scheme that conveys
data by changing, or modulating, both the amplitude and the phase of a reference signal (the carrier wave).
8 Phase-shift keying (8PSK) is a digital modulation scheme that conveys data by changing, or modulating, the phase of a
reference signal (the carrier wave).
BCH code is a multilevel cyclic variable-length digital error-correcting code used for correcting multiple random error
patterns. BCH codes may also be used with multilevel phase-shift keying whenever the number of levels is a prime number
or a power of a prime number.
Block Up-Converter (BUC) is used in the transmission (uplink) of satellite signals. It converts a band (or "block") of
frequencies from a lower frequency to a higher frequency.
Bandwidth is the difference between the upper and lower frequencies in a continuous set of frequencies.
Carrier-to-noise ratio, often written as CNR or C/N, is the signal-to-noise ratio (SNR) of a modulated signal.
Carrier is a waveform that is modulated with an input signal for the purpose of conveying information.
Constant coding and modulation. DVB-S2 mode when MODCOD is not changed during channel operation.
Communication on the move
Compressing IP/UDP/RTP Headers for Low-Speed Serial Links.
Demand Assigned Multiple Access. Channel establishment on demand.
Data (bit) rate is the number of bits that are conveyed or processed per unit of time.
Differentiated Services Code Point (DSCP) is a 6-bit field in the header of IP packets for packet classification purposes. DSCP
replaces the outdated IP precedence, a 3-bit field in the Type of Service byte of the IP header originally used to classify and
prioritize types of traffic
Digital Video Broadcasting (DVB) is a suite of internationally accepted open standards for digital television.
Eb/No (the energy per bit to noise power spectral density ratio) is a normalized signal-to-noise ratio (SNR) measure, also
known as the “SNR per bit”.
Effective Isotropically Radiated Power
The European Telecommunications Standards Institute (ETSI).
Forward error correction (FEC) is a system of error control for data transmission, whereby the sender adds redundant data
to its messages, also known as an error-correction code.
Digital data transmission unit (consequence of packets) of fixed length and periodicity.
Method of transmission queues handling when packets from lower priority queue are not transmitted until all packets
from higher priority queue are transmitted.
Hypertext Transfer Protocol (HTTP) is an application-level protocol for distributed, collaborative, hypermedia information
systems.
Central Station of satellite network that is managing all the terminals and resources.
The Internet Control Message Protocol (ICMP) is used by networked devices to send error messages—indicating, for
instance, that a requested service is not available or that a host or router could not be reached.
Intelsat Earth Station Standards
Intermediate Frequency is a frequency to which a carrier frequency is shifted as an intermediate step in transmission or
reception.
Connection from the indoor equipment (modem/router) to the outdoor equipment at the antenna normally involves two
inter-facility (IFL) cables.
The Internet Group Management Protocol (IGMP) is a communications protocol used by hosts and adjacent routers on IP
networks to establish multicast group memberships.
IP is the usual abbreviation for Internet Protocol.
Low-density parity-check (LDPC) code is a linear error correcting code, a method of transmitting a message over a noisy
transmission channel, and is constructed using a sparse bipartite graph.
Low-noise block converter is the receiving converter installed at satellite antenna.
Oscillator built into RF block converter (BUC or LNB) for the purpose of converting RF-IF frequencies. Value of LO is usually
written on block enclosure or in datasheet.
DVB-S2 frames 64800 bits long (including FEC). Require slightly lower C/N than short frames.
Multiple channels per carrier. All TDM carriers generated by UHP can be treated as MCPC. Even if they are called SCPC.
Modulation and coding mode.
Network Management System
To Next Page
Loading...