Ubee DDW36C

Ubee Interactive Glossary
Ubee DDW36C Advanced Wireless Gateway Subscriber User Guide • October 2015 99
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.