User's Manual

Chapter 11: Troubleshooting
Registration and connectivity troubleshooting
Page XI
Term
Definition
Reflection
Change of direction and reduction of amplitude of a signal that
encounters an object larger than the wavelength. Reflection may
cause an additional copy of the wavelength to arrive after the
original, unobstructed wavelength arrives. This causes partial
cancellation of the signal and may render the link unacceptable.
However, in some instances where the direct signal cannot be
received, the reflected copy may be received and render an
otherwise unacceptable link acceptable.
Region Code
A parameter that offers multiple fixed selections, each of which
automatically implements frequency band range restrictions for the
selected region. Units shipped to regions other than the United
States must be configured with the corresponding Region Code to
comply with local regulatory requirements.
RF
Radio frequency. How many times each second a cycle in the
antenna occurs, from positive to negative and back to positive
amplitude.
RJ-12
Standard cable that is typically used for telephone line or modem
connection.
RJ-45
Standard cable that is typically used for Ethernet connection. This
cable may be wired as straight-through or as crossover. Later
modules auto-sense whether the cable is straight-through or
crossover.
Router
Network element that uses the logical (IP) address of another to
pass data to only the intended recipient. Compare to Switch and
Bridge.
RSSI
Radio Signal Strength Indicator. A relative measure of the strength
of a received signal. An acceptable link displays an RSSI value of
greater than 700.
Self-interference
Interference with a module from another module in the same
network.
SFP
Small Form-factor Pluggable
Simple Network
Management Protocol
Standard that is used for communications between a program
(agent) in the network and a network management station
(monitor). Defined in RFC 1157. See
http://www.faqs.org/rfcs/rfc1157.html.
SM
Customer premises equipment (CPE) device that extends network or
Internet services by communication with an Access Point Module or
an Access Point cluster.
SNMP
See Simple Network Management Protocol, defined in RFC 1157.