User's Manual

EXCELMAX ACCESS POINT CELL INSTALLATION AND MAINTENANCE GUIDE VERSION 1.4
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Polling Interval The frequency with which a management station invites network nodes to
tr
ansmit management information from several seconds to several hours.
Transmits packets that can themselves add to network congestion, especially if
the poll is too frequent on a big network.
PSU Power Supply Unit
QPSK
Quadrature Phase Shift Keying. Two phase carriers are at 90 to each other
and are thus electrically isolated.
RF Radio Frequency: Signals that appear in the air link from antenna to antenna.
RSSI Radio Signal Strength Indicator. Either visua
l or audio indicator used in antenna
pointing.
Rx Symbol meaning “Receive.”
Signal-To-Noise
Ra
tio (SNR)
A measure of how much stronger a signal is than the background noise; usually
expressed in decibels (dB)
SNMP The Simple Network Management Protocol, developed to manage TCP/IP and
Ethe
rnet networks
Spectrum A continuous range of frequencies, usually
wide in extent, within which waves
have some specific common characteristics
Symbol Rate In digital transmission, a recognizable electrical st
ate which is associated with a
signal element, which is an electrical signal within a defined period of time. In
binary transmission, for example, a signal element is represented as one of two
possible states or symbols, i.e., 1 or 0.
Threshold A level, point, or value above which something is
true or will take place and
below which, it is not true or will not take place.
Throughput The amount of data passed through a network measured in units of time, or as a
p
ercentage of the time available.
Transceiver Device used to transmit and receive RF traffic.
Tx Symbol meaning “Transmit.”
Upstream Network traffic passing from CPE
to the Access Point.
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