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.
