Ubee DDW365 User Manual page 85

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Downstream
A term to describe the direction of data from the network service provider to the customer.
Dynamic Host Configuration Protocol (DHCP)
A protocol that centrally automates the assignment of IP addresses in a network. Using
the Internet's set of protocols (TCP/IP), each machine that can connect to the Internet
needs a unique IP address. For example, when the service provider sets up computer
users with a connection to the Internet, an IP address is assigned to each machine.
DHCP lets the service provider distribute IP addresses and automatically sends a new IP
address when a computer is plugged in to the high-speed Internet network. DHCP uses
the concept of a "lease" or amount of time an IP address is valid for a computer. Lease
times can vary.
Ethernet
A standard network protocol that specifies how data is placed on and retrieved from a
common transmission medium. It forms the underlying transport vehicle used by several
upper-level protocols, including TCP/IP, HTTP, and FTP.
Firewall
A highly effective method to block unsolicited traffic from outside the connected
computers in your gateway and local network.
Gateway
A local device, usually a router, that connects hosts on a local network to other networks
– sometimes with different incompatible communication protocols. The DDW365 is an
example of a gateway.
Headend
A main facility to process and distribute Internet communication signals. Headend may
also refer to cable television signals and power line communication facilities.
Internet Protocol (IP)
The method or protocol by which data is sent from one computer to another on the
Internet. It is a standard set of rules, procedures, or conventions relating to the format and
timing of data transmission between two computers that they must accept and use to
understand each other. Used in conjunction with the Transfer Control Protocol (TCP) to
form TCP/IP.
Internet Service Provider (ISP)
A company that provides individuals and companies access to the Internet and other
related services.
Interval Usage Code (IUC)
Interval usage codes define different profiles for upstream burst profiles to use for the
data. IUCs are sent to the cable modem from the CMTS to tell the device important
characteristics to use for the burst, such as modulation type, preamble length, and so on.
Ubee DDW365 Wireless Cable Modem Subscriber User Guide • October 2013
Glossary
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