Wi-LAN Hopper Plus 120-24 Installation And Configuration Manual page 175

T
telnet
An Internet communications protocol that enables a computer to function as a terminal
working on a remote computer. A computer with a network connection to a Hopper
Plus 120-24 can use telnet to access its configuration menus.
throttling
Throttling limits the amount of data that a remote station passes. This feature is used to
improve overall system performance by adjusting the throughput of a unit to match the
throughput of other devices in the network.
U
uptilt
See downtilt.
V
VSWR (Voltage Standing Wave Ratio)
VSWR is the voltage ratio of minimum to maximum across a transmission line. A VSWR
of 2.0:1 or less in an antenna is considered effective. Most antennas have a VSWR of 1.5:1.
For example, when using a radio with a 4 watt output with an antenna VSWR of 1.5:1, the
reflected power will be 160 milliwatts.
W
W-OFDM
Wide-band orthoganal frequency division multiplexing. A method patented by Wi-LAN
that divides a channel into several sub-channels, spreading the signal over the subchannels
and correcting errors without having to retransmit. W-OFDM permits several
independent channels to operate within the same band, enabling multipoint networks and
point-to-point systems to be overlaid in the same frequency band.
X
XPD (Cross-Polarization Discrimination)
Antennas have an associated polarity, which is the orientation of the radiating element
with respect to earth. Antennas are usually described as being vertically, horizontally or
circularly polarized. The polarity of all antennas used in a system must be the same. XPD
specifies the amount of signal isolation achieved when the receiving element is
perpendicular to the radiating element. This can be advantageous when co-locating radio
systems.
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