User guide

Glossary Canopy System User Guide
608
pmp-0229 (Mar 2013)
IP Address
32-bit binary number that identifies a network element by both network
and host. See also Subnet Mask.
IPv4
Traditional version of Internet Protocol, which defines 32-bit fields for
data transmission.
ISM
Industrial, Scientific, and Medical Equipment radio frequency band, in
the 900-MHz, 2.4-GHz, and 5.8-GHz ranges.
Jitter
Timing-based measure of the reception quality of a link. An acceptable
link displays a jitter value between 0 and 4 for a 10-Mbps Backhaul
timing slave in Release 4.0 and later, between 0 and 9 for a 20-Mbps
Backhaul timing slave, or between 5 and 9 for any Subscriber Module
or for a Backhaul timing slave in any earlier release. OFDM modules
do not have this parameter.
L2TP over IPSec
Level 2 Tunneling Protocol over IP Security. One of several virtual
private network (VPN) implementation schemes. Regardless of
whether Subscriber Modules have the Network Address Translation
feature (NAT) enabled, they support VPNs that are based on this
protocol.
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 or a Backhaul timing slave, 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.