User Manual

AirLink Pro T1/E1 Rack Mount Installer’s Guide
Glossary
Rev. B - 1/97
D-6
generated within limited parameters. The stream (sequence)
is typically used for encoding data for communication.
QRSS Quasi-Random Signal Sequence. A test pattern used to test
the continuity and integrity of a link.
receiver sensitivity The measure of the ability of a receiver to differentiate
between the selected signal and background noise for a
specific performance.
Red Alarm A locally-detected failure that occurs when DS1 frame
synchronization is lost (i.e., when errors are detected in at
least two out of four, or three out of five consecutive framing
bits) and is declared when one of these OOF conditions has
been detected in the network for 2.5 consecutive seconds.
RF Radio Frequency. Electromagnetic waves propagated without
guide (wire or cable) in free space.
RSQ Receive Signal Quality. A figure of merit that is normalized
on a scale of 1 to 10, and is a function of the receive signal-to-
noise ratio and signal-to-interference ratio. A strong signal
that is severely corrupted with interference results in a
normal receive signal indication and a low RSQ number.
RSS Receive Signal Strength. The measured signal strength at the
AirLink Pro T1/E1.
signal-to-noise ratio The ratio of the signal power to the noise power at a given
point in a given system; usually expressed in decibels (dB).
system gain The sum of the transmitter power output and the receiver
sensitivity (the ability of the transmitter to produce a strong
signal, combined with the ability of the receiver to detect a
weak signal).
transmitter output power The amount of transmitted signal strength measured at the
antenna connector of the AirLink Pro T1/E1.
Typical Power Output The mean transmitter power output, as specified in FCC
regulations.
Terminal Switching Device A matrix switching device that allows any of its ports to
communicate with any other connected port, or any pair of
ports to communicate simultaneously.
Unavailable Second. An unavailable second is defined as any