Comtech EF Data Vipersat SLM-5650A User Manual page 141

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 /N The ratio of E
b 0
error rate (BER) for digital data is a decreasing function of this ratio. E
energy of an information bit measured in Joules or, equivalently, in Watts per
Hertz.
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
A p p e n d i x D - G l o s s a r y
(energy per bit) and N
b
D
E
(noise power density per Hz). The bit
0
F
is the
b
D-3