Proxim Tsunami MP-8100 Series Reference Manual page 97

Simple Network
Protocol (SNMP)
Spanning Tree Protocol (STP)
TSTP
Subnet Mask
Subscriber Unit
System Gain
Tsunami MP-8100 Reference Manual
Management A protocol used for the communication between a network management
application and the devices it is managing. The network management
application is called the SNMP manager and the devices it manages will
have SNMP agents. Not only the unit but also almost every network device
contains a SNMP agent. The manageable objects of a device are arranged
in a Management Information Base, also called MIB. The Simple Network
Management Protocol (SNMP) allows managers and agents to
communicate for accessing these objects.
The Spanning Tree Protocol (STP) can be used to create redundant
networks ("hot standby") and to prevent loops. If enabled, spanning tree
prevents loops by disabling redundant links. If a link fails, it can
automatically enable a backup link.
Shielded Twisted Pair
A subnet mask is a bit mask that defines which part of an IP address is
used for the network part and which part for a host (computer) number.
A subnet mask is like an IP address represented by four numbers in the
range 0 - 255 separated by dots. When the IP address 172.17.23.14 has a
subnet mask of 255.255.255.0, the network part is 172.17.23 and the
host number is 14. See also IP address.
If an interface is running in outdoor mode (WORP), it is either a base or a
subscriber interface. Subscriber interface behavior is controlled by the
base to which it is registered. SUs are located in the remote locations of a
network cell. Multiple SUs can connect to one base; two SUs cannot
communicate with each other. See also WORP and base.
Radio system gain is the sum of transmitter gain plus its corresponding
receiver gain. For example, a transmitter having a power output of 20
dBm combined with a receiver having a threshold sensitivity of – 80 dBm
results in a radio system gain of 100 dB.
Antenna System Gain: Antenna system gain is the net (combined) gain
of a transmitting antenna plus the gain of a receiving antenna, minus the
loss of the cables that connect the transmitter and receiver to their
respective antennas. For example, at 5.8 GHz, a two-foot dish antenna
has a nominal gain of 28 dBi, and low-loss cable has a loss of 6 dB/100
feet. Therefore the antenna system gain for a pair of two-foot dishes and
100 feet of low-loss cable would be 50 dB (28 + 28 – 6).
Total System Gain: Total system gain is the sum of antenna system gain
plus radio system gain.
Net System Gain: Net system gain is the amount of system gain left after
the effect of free-space and all other propagation losses have been
subtracted from the total system gain. The net system gain (if a positive
number) is also referred to as Fade Margin.
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Glossary
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