User's Manual

Table Of Contents
PMP 450 Operations Guide
Glossary
pmp-0049 (September 2012)
VII
Term
Definition
Late Collision Field
This field displays how many late collisions occurred on the Ethernet controller.
A normal collision occurs during the first 512 bits of the frame transmission. A
collision that occurs after the first 512 bits is considered a late collision. A late
collision is a serious network problem because the frame being transmitted is
discarded. A late collision is most commonly caused by a mismatch between
duplex configurations at the ends of a link segment.
Latency Tolerance
Acceptable tolerance for delay in the transfer of data to and from a module.
Line of Sight
Wireless path (not simply visual path) direct from module to module. The path
that results provides both ideal aim and an ideal Fresnel zone.
Linux
A registered trademark of Linus Torvalds.
LNK/5
Furthest left LED in the module. In the operating mode, this LED is
continuously lit when the Ethernet link is present. In the aiming mode for a
Subscriber Module, this LED is part of a bar graph that indicates the quality of
the RF link.
Logical Unit ID
Final octet of the 4-octet IP address of the module.
LOS
Line of sight. The wireless path (not simply visual path) direct from module to
module. The path that results provides both ideal aim and an ideal Fresnel
zone.
LUID
Logical Unit ID. The final octet of the 4-octet IP address of the module.
MAC Address
Media Access Control address. The hardware address that the factory assigns to
the module for identification in the Data Link layer interface of the Open
Systems Interconnection system. This address serves as an electronic serial
number.
Management
Information Base
Space that allows a program (agent) in the network to relay information to a
network monitor about the status of defined variables (objects).
Maximum
Information Rate
(MIR)
The cap applied to the bandwidth of an SM or specified group of SMs. In the
Cambium implementation, this is controlled by the Sustained Uplink Data
Rate, Uplink Burst Allocation, Sustained Downlink Data Rate, and Downlink
Burst Allocation parameters.
Media Access
Control Address
Hardware address that the factory assigns to the module for identification in
the Data Link layer interface of the Open Systems Interconnection system.
This address serves as an electronic serial number.
MIB
Management Information Base. Space that allows a program (agent) in the
network to relay information to a network monitor about the status of defined
variables (objects).
MIR
See Maximum Information Rate.
NAT
Network Address Translation defined in RFC 1631. A scheme that isolates
Subscriber Modules from the Internet. See
http://www.faqs.org/rfcs/rfc1631.html.