Exposure Separation Distances
Chapter 1:
A-8
pmp-0050 (May 2012)
inunknownprotos
count Field
How many inbound packets were discarded because of an unknown or unsupported
protocol.
IP
Internet Protocol defined in RFC 791. The Network Layer in the TCP/IP protocol stack.
This protocol is applied to addressing, routing, and delivering, and re-assembling data
packets into the Data Link layer of the protocol stack. See
http://www.faqs.org/rfcs/rfc791.html
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.
Summary of Contents for PMP 450
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