ADS Technologies SBG1000 manual 139, Dhcp, Dmz, Dns, Docsis

Overview Installation Troubleshooting Contact	FAQ Specifications	Glossary	License
Configuration: Basic Gateway TCP/IP	Wireless Print Server	USB

D

datagram	In RFC 1594, a datagram is defined as “a self-contained, independent entity of data carrying sufficient
	information to be routed from the source to the destination computer without reliance on earlier
	exchanges between this source and destination computer and the transporting network.” For the most
	part, it has been replaced by the term packet.
default route	The route by which packets are forwarded when other routes in the routing table do not apply.
dB	decibel
dBc	Signal level expressed in dB relative to the unmodulated carrier level desired.
DBm	A unit of measurement referenced to one milliwatt across specified impedance. 0dBm = 1 milliwatt
	across 75 ohms.
dBmV	Signal level expressed in dB as the ratio of the signal power in a 75-ohm system to a reference power
	when 1 mV is across 75 ohms.
demodulation	An operation to restore a previously modulated wave and separate the multiple signals that were
	combined and modulated on a subcarrier.
DHCP	A Dynamic Host Configuration Protocol server dynamically assigns IP addresses to client hosts on an
	IP network. DHCP eliminates the need to manually assign static IP addresses by “leasing” an
	IP address and subnet mask to each client. It enables the automatic reuse of unused IP addresses:
	The SBG1000 is simultaneously a DHCP client and a DHCP server.
	• A DHCP server at the cable system headend assigns a public IP address to the SBG1000 and
	optionally to clients on the SBG1000 LAN.
	• The SBG1000 contains a built-in DHCP server that assigns private IP addresses to clients.
distortion	An undesired change in signal waveform within a transmission medium. A nonlinear reproduction of
	the input waveform.
diversity	Two identical antennas located a small distance apart to reduce multipath distortion and improve
antennas	wireless reception. Properly placed diversity antennas improve SBG1000 wireless reception.
DMZ	A “de-militarized zone” is one or more hosts logically located between a private LAN and the Internet.
	A DMZ prevents direct access by outside users to private data. (The term comes from the geographic
	buffers located between some conflicting countries such as North and South Korea.) In a typical small
	DMZ configuration, the DMZ host receives requests from private LAN users to access external web
	sites and initiates sessions for these requests. The DMZ host cannot initiate a session back to the
	private LAN. Internet users outside the private LAN can access only the DMZ host. You can use a
	DMZ to set up a web server or for gaming without exposing confidential data.
DNS	The Domain Name System is the Internet system for converting domain names to IP addresses. A
	DNS server contains a table matching domain names such as Internetname.com to IP addresses
	such as 192.169.9.1. When you access the world-wide web, a DNS server translates the URL
	displayed on the browser to the destination website IP address. The DNS lookup table is a distributed
	Internet database; no one DNS server lists all domain name to IP address matches.
DOCSIS	The CableLabs Data-Over-Cable Service Interface Specification defines interface standards for cable
	modems, gateways, and supporting equipment to deliver data between an HFC network and a
	computer systems or television sets. To emphasize its use as a cable modem standard, DOCSIS is
	now called CableLabs Certified Cable Modems. Euro-DOCSIS is DOCSIS adapted for use in Europe.
domain name	A unique name, such as motorola.com, that maps to an IP address. Domain names are typically much
	easier to remember than are IP addresses.
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