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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.

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