User's Manual

PMP 450 Planning Guide Glossary
Term Definition
ARP Address Resolution Protocol. A protocol defined in RFC 826 to allow a network
element to correlate a host IP address to the Ethernet address of the host. See
http://www.faqs.org/rfcs/rfc826.html
.
ASN.1 Abstract Syntax Notation One language. The format of the text files that compose the
Management Information Base.
Attenuation Reduction of signal strength caused by the travel from the transmitter to the receiver,
and caused by any object between. In the absence of objects between, a signal that has
a short wavelength experiences a high degree of attenuation nevertheless.
BER Bit Error Rate. The ratio of incorrect data received to correct data received.
Bit Error Rate Ratio of incorrect data received to correct data received.
Box MIB Management Information Base file that defines module-level objects. See also
Management Information Base.
Bridge Network element that uses the physical address (not the logical address) of another to
pass data. The bridge passes the data to either the destination address, if found in the
simple routing table, or to all network segments other than the one that transmitted the
data. Modules are Layer 2 bridges except that, where NAT is enabled for an SM, the
SM is a Layer 3 switch. Compare to Switch and Router, and see also NAT.
Bridge Entry
Timeout Field
Value that the operator sets as the maximum interval for no activity with another
module, whose MAC address is the Bridge Entry. This interval should be longer than
the ARP (Address Resolution Protocol) cache timeout of the router that feeds the
network.
Buckets Theoretical data repositories that can be filled at preset rates or emptied when preset
conditions are experienced, such as when data is transferred.
Burst Preset amount limit of data that may be continuously transferred.
C/I Ratio Ratio of intended signal (carrier) to unintended signal (interference) received.
Carrier-to-
interference Ratio
Ratio of intended reception to unintended reception.
CarSenseLost Field This field displays how many carrier sense lost errors occurred on the Ethernet
controller.
CAT 5 Cable Cable that delivers Ethernet communications from module to module. Later modules
auto-sense whether this cable is wired in a straight-through or crossover scheme.
CIR Committed Information Rate. For an SM or specified group of SMs, a level of
bandwidth that can be guaranteed to never fall below a specified minimum (unless
oversubscribed). In the Cambium implementation, this is controlled by the Low
Priority Uplink CIR, Low Priority Downlink CIR, High Priority Uplink CIR, and High
Priority Downlink CIR parameters.
CLIP Cassegrain Lens for Improved Performance
II
pmp-0047 (March 2014)