Comtech EF Data Vipersat CDM-570L, User Manual

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Vipersat CDD-564L User’s Guide
BPSK B inary P hase S hift K eying – A modulation technique in which the carrier is
phase s/- 180 degrees. See also QPSK
C
C-Band A frequency band commonly used for satellite communications (and sometimes
terrestrial microwave). For terrestrial earth stations the receive frequency band
is 3.7-4.2GHz and transmit 5.925-6.425GHz. See also Ku-band.
CRC C yclic R edundancy C heck – A method of applying a checksum to a block of
data to determine if any errors occurred during transmission over communica-
tions links.
CXR Carrier – A radio frequency transmission bearer linking points and over which
information may be carried.
D
DAMA D emand A ssigned M ultiple A ccess – A process whereby communications links
are only activated when there is an actual demand.
dBm
D eci b el referenced to 1 m illiwatt.
DHCP
The Dynamic Host Configuration Protocol (DHCP) is an Internet protocol for
automating the configuration of computers that use TCP/IP.
DNA
D ynamic N ode A nnouncement – In VIPERSAT satellite networks a process
whereby remote sites periodically announce their presence to facilitate network
setup and monitoring.
DOS
D isk O perating S ystem – A computer operating system.
DPC D ynamic P ower C ontrol.
DRAM D ynamic R andom A ccess M emory
DSP D igital S ignal P rocessor – A microprocessor chip optimized for signal process-
ing applications.
DVB D igital V ideo B roadcast
DVP D igital V oice P rocessor – The VIPERSAT voice card used in packet voice
applications.