UHP SCPC MODEM
USER MANUAL, v3.2
© ROMANTIS 2015
5
www.uhp.net
ACRONYMS AND ABBREVIATIONS
NAME
DESCRIPTION
16APSK
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).
32APSK
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).
8PSK
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).
AGC
Automatic Gain Control.
BCH
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.
BUC
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
Bandwidth is the difference between the upper and lower frequencies in a continuous set of frequencies.
C/N
Carrier-to-noise ratio, often written as CNR or C/N, is the signal-to-noise ratio (SNR) of a modulated signal.
Carrier
Carrier is a waveform that is modulated with an input signal for the purpose of conveying information.
CCM
Constant coding and modulation. DVB-S2 mode when MODCOD is not changed during channel operation.
COTM
Communication on the move
CRTP
Compressing IP/UDP/RTP Headers for Low-Speed Serial Links.
DAMA
Demand Assigned Multiple Access. Channel establishment on demand.
Data
transmission
Data transmission.
Data rate
Data (bit) rate is the number of bits that are conveyed or processed per unit of time.
DSCP
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replaces the outdated IP precedence, a 3-bit field in the Type of Service byte of the IP header originally used to classify and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
DVB
Digital Video Broadcasting (DVB) is a suite of internationally accepted open standards for digital television.
ES
Earth station
Eb/No
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”.
EIRP
Effective Isotropically Radiated Power
ETSI
The European Telecommunications Standards Institute (ETSI).
FEC
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.
Frame
Digital data transmission unit (consequence of packets) of fixed length and periodicity.
Hard priority
Method of transmission queues handling when packets from lower priority queue are not transmitted until all packets
from higher priority queue are transmitted.
HTTP
Hypertext Transfer Protocol (HTTP) is an application-level protocol for distributed, collaborative, hypermedia information
systems.
HUB
Central Station of satellite network that is managing all the terminals and resources.
HW
Hardware.
ICMP
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.
IESS
Intelsat Earth Station Standards
IF
Intermediate Frequency is a frequency to which a carrier frequency is shifted as an intermediate step in transmission or
reception.
IFL
Connection from the indoor equipment (modem/router) to the outdoor equipment at the antenna normally involves two
inter-facility (IFL) cables.
IGMP
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
IP is the usual abbreviation for Internet Protocol.
LDPC
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.
LNB
Low-noise block converter is the receiving converter installed at satellite antenna.
Local oscillator
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.
Long frames
DVB-S2 frames 64800 bits long (including FEC). Require slightly lower C/N than short frames.
MCPC
Multiple channels per carrier. All TDM carriers generated by UHP can be treated as MCPC. Even if they are called SCPC.
MODCOD
Modulation and coding mode.
NMS
Network Management System