Comtech EF Data SLM-5650A Vipersat Parameter Editor - Manual (Page 67)

Appendix A - Glossary A-3
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.
Down-
stream
In the direction of the network Remote site(s).
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 Broadcast
DVP Digital Voice Processor – Used in packet voice applications.
E
E
b
/N
o
E
b
/N
o
is the ratio of E
b
(energy per bit) and N
o
(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
easy to quickly upgrade the feature options of a modem while it is running live
in the network, either on site or remotely.
FEC Forward Error Correction – A process whereby data being transmitted over a
communications link can have error correction bits added which may be used at
the receiving end to determine/correct any transmission errors which may occur.
Flash Non-volatile computer memory that can be electrically erased and repro-
grammed.