User's Manual

InterReach Unison Installation, Operation, and Reference Manual D-7
D-620003-0-20 Rev J CONFIDENTIAL
Signal to Noise Ratio The ratio of signal power to noise power at a given point in a
given system.
Smart Antenna Refers to an antenna whose signal handling characteristics change
as signal conditions change.
Soft Handoff Virtually undetectable by the user, soft handoff allows both the origi-
nal cell and a new cell to serve a call temporarily during the handoff transition.
Spectrum The range of electromagnetic frequencies.
Spread Spectrum A method of transmitting a signal over a broad range of frequen-
cies and then re-assembling the transmission at the far end. This technique
reduces interference and increases the number of simultaneous conversations
within a given radio frequency band.
T-1 A North American commercial digital transmission standard. A T-1 connection
uses time division multiplexing to carry 24 digital voice or data channels over
copper wire.
TDMA Time Division Multiple Access. A method of digital wireless communica-
tions that allows multiple users to access (in sequence) a single radio frequency
channel without interference by allocating unique time slots to each user within
each channel.
TIA Telecommunications Industry Association.
TR-45 One of six committees of the Telecommunications Industry Association.
TR-45 oversees the standard making process for wireless telecommunications.
Upbanded A service or technology that has been re-engineered to operate at a
higher frequency than originally designed.
Wireless Describes any radio-based system that allows transmission of voice and/or
data signals through the air without a physical connection, such as a metal wire
or fiber optic cable.
Wireline Wire paths that use metallic conductors to provide electrical connections
between components of a system, such as a communication system.
WLANs Wireless Local Area Networks. Technology that provides wireless com-
munications to Portable Computer users over short distances.