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Ubee Interactive
Glossary
Ubee DDW366 Dual-Band Concurrent Advanced Wireless Gateway Subscriber User Guide
•
September 2014
102
Ranging
A process in which a cable modem sends a range request at a power of 8 dBmV (very low
power). If it does not receive a range response from the CMTS, the cable modem re-
transmits the range request at a 3 dB higher power level and continues the process until
a range response is received.
Router
A device that forwards data between networks. An IP router forwards data based on IP
source and destination addresses.
RIP (Routing Information Protocol)
A protocol in which routers periodically exchange information with one another to
determine minimum-distance paths between sources and destinations.
RSSI (Received Signal Strength Indicator)
A measurement of the power present in a received radio signal. Lower negative numbers
(for example, -1 to -65) indicate the access point is closer. Greater negative numbers (for
example, -66 to -95) indicate the access point is farther away. RSSI is optimal between
0dBm and -64dBm.
RSVP (Resource Reservation Protocol)
A set of communication rules that allows channels or paths on the Internet to be reserved
for the multicast transmission of video and other high-bandwidth messages.
RTSP (Real Time Streaming Protocol)
A protocol used in the transfer of real-time streaming media such as audio and video.
Service Set Identifier (SSID)
A sequence of characters that uniquely names a wireless local area network (WLAN). The
SSID allows stations to connect to the desired network when multiple independent
networks are operating in the same physical area.
SIP (Session Initiation Protocol)
A signaling communications protocol that is widely used for controlling multimedia
communications sessions such as voice and video over Internet Protocol networks.
SNR (Signal-to-Noise Ratio)
A measure that compares the level of a desired signal to the level of background noise.
SNTP (Simple Network Time Protocol)
A protocol for synthesizing the clocks of computing devices over networks.
STBC (Space-Time Block Code))
A technique used in wireless communications to transmit multiple copies os a data stream
across a number of antennas.
Page 107 / 108
Ubee Interactive
Glossary
Ubee DDW366 Dual-Band Concurrent Advanced Wireless Gateway Subscriber User Guide
•
September 2014
103
Subnet
A portion of a network that shares a common address component. On TCP/IP networks,
subnets are defined as all devices whose IP addresses have the same prefix. For
example, all devices with IP addresses that start with 10.1.10 would be part of the same
subnet. IP networks are divided using a subnet mask.
Subnet Mask
Combined with the IP address, the IP subnet mask allows a device to know which other
addresses are local to it, and which must be reached through a gateway or router. A
number that explains which part of an IP address comprises the network address and
which part is the host address on that network.
Telnet
A network protocol used on the Internet or a local area network. Provides bi-directional
interactive text-oriented communications using a virtual terminal connection.
TACACS (Terminal Access Controller Access-Control System)
A remote authentication protocol used to communicate with an authentication server to
determine if the user is allowed to access the network.
TCP (Transmission Control Protocol)
A method (protocol) used with the IP to send data in the form of message units
(datagrams) between network devices over a LAN or WAN. While IP handles the actual
delivery of the data (routing), TCP keeps track of the individual units of data (packets) that
a message is divided into for efficient delivery over the network. TCP requires the receiver
of a packet to return an acknowledgment of receipt to the sender of the packet.
TCP/IP (Transmission Control Protocol/Internet Protocol)
The basic communication language or set of protocols to communicate over a network
(developed specifically for the Internet). TCP/IP defines a suite or group of protocols.
TDMA (Time Division Multiple Access)
A method in which cable modems must time-share the upstream channel because there
are many cable modems and only one upstream channel frequency.
TFTP (Trivial File Transfer Protocol)
A file transfer protocol used to transfer automatically configuration or boot files.
TPC (Transmit Power Control)
Sometimes called Dynamic Power Control (DPC), TPC is a mechanism used in radio
communications to reduce the power of a radio transmitter to the minimum necessary to
maintain the link with a certain quality. It is used to avoid interference with other devices
and/or to extend battery life.
UDP (User Datagram Protocol)
A communications protocol that offers a limited amount of service when messages are
exchanged between computers in a network that uses the Internet Protocol.
Page 108 / 108
Ubee Interactive
Glossary
Ubee DDW366 Dual-Band Concurrent Advanced Wireless Gateway Subscriber User Guide
•
September 2014
104
UPNP (Universal Plug and Play)
A set of networking protocols that permits networked devices to seamlessly discover each
other’s presence on the network to enable data sharing, communications, and
entertainment.
Upstream
A term to describe the direction of data from the customer to the network service provider.
URI (Uniform Resource Identifier)
A string of characters used to identify a name or a resource on the Internet.
URL (Uniform Resource Locator)
A uniform resource identifier (URI) that specifies where a known resource is available and
how to retrieve it.
WAN (Wide Area Network)
A long-distance link or computer network that spans a relatively large geographical area
that connects remotely located LANs. Typically, a WAN consists of two or more LANs.
The Internet is a large WAN.
WEP (Wired Equivalent Privacy)
An encryption method used to protect your wireless data communications. WEP uses 64-
bit or 128-bit keys to provide access control to your network and security for everyday
transmissions. To decode data transmissions, all devices on the network must use an
identical key.
WLAN (Wireless Local Area Network)
A communications network that uses high frequency radio signals to allow wireless
devices to communicate with each other within a limited geographic area.
WPA (Wi-Fi Protected Access)
A security protocol for wireless networks offering improvements over the WEP protocol in
the way it handles security keys and the way users are authorized.
WPS (Wi-Fi Protected Setup)
A security protocol for wireless home networks. Created by the Wi-Fi Alliance, this
protocol allows home users to easily set up wireless security and add new devices without
needing to enter long passwords.
XML (Extensible Markup Language)
A markup language that defines a set of rules for encoding documents in a format that is
both human-readable and machine readable.
XPress™
XPress™ is a
standards-based frame-bursting approach to improve 802.11g wireless LAN
performance developed by Broadcom.

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