Comtech EF Data VMS v3.12.x Vipersat - Manual (Page 534)

MN/22156, rev 12
H-2 VMS User Guide
BER Bit Error Rate (sometimes Ratio) – A measure of the number of data bits
received incorrectly compared to the total number of bits transmitted.
BPM Bridge Point-to-Multipoint – Routing mode option available in the SLM-5650A
satellite modem.
bps bits per second – A measure of the bit rate or transmission speed of a digital
communication link. See also kbps and Mbps.
BPSK Binary Phase Shift Keying – Sometimes referred to as 2-PSK. A digital modu-
lation technique in which the carrier is phase shifted +/-180 degrees (two
phases). The simplest and most robust of all PSKs, but unsuitable for high data-
rate applications when bandwidth is limited due to encoding just one bit per
symbol. See also QPSK and OQPSK.
BUC Block Up Converter – An upconverter so called because it converts a whole
band or “block” of frequencies to a higher band. The IF is converted to final
transmit frequency for satellite communications. The BUC is part of the satellite
ODU/transceiver.
C
C-band A frequency band commonly used for satellite communications (and sometimes
terrestrial microwave). For terrestrial earth stations, the receive frequency band
is 3.7–4.2 GHz and the transmit frequency band is 5.925–6.425 GHz. See also
Ku-band and L-band.
CDD Comtech Data Demodulator (CEFD model designator; e.g., CDD-564)
CDM Comtech Data Modem (CEFD model designator; e.g., CDM-570)
CEFD Comtech EF Data – Global leader in satellite bandwidth efficiency and link
optimization, and supplier of advanced communication solutions. A subsidiary
of Comtech Telecommunications Corporation.
CIR Committed Information Rate – A specified data rate up to which a remote
terminal is always guaranteed to be granted service from reserved bandwidth in
the shared pool.
CLI Character Line Interface – A mechanism for interacting with a computer oper-
ating system or software by typing commands to perform specific tasks.
Codecast A network coding based ad hoc multicast protocol well-suited for multimedia
applications with low-loss, low-latency constraints. Because data is streamed
with no verification, high delivery ratios are obtained with very low overhead.