Comtech EF Data SLM-5650A Vipersat - Manual (Page 141)

Appendix D - Glossary D-3
D
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.
DES Data Encryption Standard – A federal standard method for encrypting informa-
tion for secure transmission. The Vipersat system offers 3xDES (Triple DES)
for encrypting traffic.
DHCP Dynamic Host Configuration Protocol – An Internet protocol for automating
the configuration of computers that use TCP/IP.
DLL Dynamic Link Library – The implementation of the shared library concept in
the Microsoft Windows system.
DPC Dynamic Power Control
DSCP Differentiated Services Code Point – The 6-bit field in an IP packet header that
is used for packet classification purposes and is the portion of ToS that is
detected by Vipersat modems.
DVB Digital Video Broadcasting – A suite of internationally accepted open standards
for digital television. DVB-S, DVB-S2, and DVB-RCS are the standards
utilized by satellite services.
DVP Digital Voice Processor – Used in packet voice applications.
E
E
b
/N
0
The ratio of E
b
(energy per bit) and N
0
(noise power density per Hz). The bit
error rate (BER) for digital data is a decreasing function of this ratio. E
b
is the
energy of an information bit measured in Joules or, equivalently, in Watts per
Hertz.
F
FAST Code Fully Accessible System Topology Code – Designation for feature code used
by Comtech EF Data for their satellite modems. The FAST method makes it