PMP 450 Planning Guide
Glossary
Term
Definition
Recharging
Resumed accumulation of data in available data space (buckets). See Buckets.
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 general geographical area that can be further segmented into specific Countries (see
Country Code). Units shipped to regions other than the United States must be
configured with the corresponding Region Code to comply with local regulatory
requirements.
Registrations MIB
Management Information Base file that defines registrations for global items such as
product identities and product components. See also Management Information Base.
RetransLimitExp
Field
This field displays how many times the retransmit limit has expired.
RF
Radio frequency. How many times each second a cycle in the antenna occurs, from
positive to negative and back to positive amplitude.
RJ-11
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.
RxBabErr Field
This field displays how many receiver babble errors occurred.
RxOverrun Field
This field displays how many receiver overrun errors occurred on the Ethernet
controller.
Secure Shell
A trademark of SSH Communications Security.
Self-interference
Interference with a module from another module in the same network.
SES/2
Third-from-right LED in the module. In the Access Point Module, this LED is unused.
In the operating mode for a Subscriber Module, this LED flashes on and off to indicate
that the module is not registered. In the aiming mode for a Subscriber Module, this
LED is part of a bar graph that indicates the quality of the RF link.
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
pmp-0047 (March 2014)
IX
Summary of Contents for PMP 450
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