Comtech EF Data Vipersat CDM-570 User Manual page 138

BPSK Binary Phase Shift Keying – A modulation technique in which the carrier is
phase shifted +/- 180 degrees. See also QPSK
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
Cyclic Redundancy Check – 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.
DAMA
Demand Assigned Multiple Access – A process whereby communications links
are only activated when there is an actual demand.
dBm Decibel referenced to 1 milliwatt.
DHCP The Dynamic Host Configuration Protocol (DHCP) is an Internet protocol for
automating the configuration of computers that use TCP/IP.
DNA Dynamic Node Announcement – In VIPERSAT satellite networks a process
whereby remote sites periodically announce their presence to facilitate network
setup and monitoring.
DOS Disk Operating System – A computer operating system.
DPC
Dynamic Power Control.
DRAM Dynamic Random Access Memory
DSP Digital Signal Processor – A microprocessor chip optimized for signal process-
ing applications.
DVB
Digital Video Broadcast
DVP Digital Voice Processor – The VIPERSAT voice card used in packet voice
applications.
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