Proxim Wireless Corporation XB92WFR User Manual
Overview
Tsunami
®
800 & 8000 Series - Software Management Guide
25
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Leased Line Redundancy: Eliminates recurring DS-3 leased line charges with one time installation charge of a
QuickBridge link.
QuickBridge link.
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Inter-POP Redundancy: Avoids downtimes caused by a wireline backhaul failure by adding a QuickBridge link as an
inter-POP redundancy.
inter-POP redundancy.
1.3 Multiple-Input-Multiple-Output (MIMO)
Proxim’s 800 & 8000 point-to-point and point-to-multipoint devices support Multiple-Input-Multiple-Output (MIMO) antenna
technology that uses multiple antennas at both the transmitter and receiver to improve communication performance. The
underlying technology of Proxim’s product radio(s) are based on a combination of MIMO and OFDM (Orthogonal Frequency
Division Multiplexing). MIMO-OFDM combination radios solve interference, fading and multipath problems On the receiver
side, having multiple receivers increases the amount of received power and also reduces multipath problems by combining
the received signals for each frequency component separately. Hence, MIMO significantly improves the overall gain.
technology that uses multiple antennas at both the transmitter and receiver to improve communication performance. The
underlying technology of Proxim’s product radio(s) are based on a combination of MIMO and OFDM (Orthogonal Frequency
Division Multiplexing). MIMO-OFDM combination radios solve interference, fading and multipath problems On the receiver
side, having multiple receivers increases the amount of received power and also reduces multipath problems by combining
the received signals for each frequency component separately. Hence, MIMO significantly improves the overall gain.
MIMO also uses Spatial multiplexing transmission technique to transmit independent and separately encoded data signals
from each of the multiple transmit antennas while reusing or multiplexing in the space dimension. These independent data
signals are called Spatial streams. The transmitting antenna uses multiple radio Tx chains and signal paths to simultaneously
transmit different data streams, whereas the receiver combines the Rx signals resulting in higher throughput.
from each of the multiple transmit antennas while reusing or multiplexing in the space dimension. These independent data
signals are called Spatial streams. The transmitting antenna uses multiple radio Tx chains and signal paths to simultaneously
transmit different data streams, whereas the receiver combines the Rx signals resulting in higher throughput.
By increasing the number of receiving and transmitting antennas, the throughput of the channel increases linearly resulting in
high spectral efficiency.
high spectral efficiency.
1.4 Wireless Outdoor Router Protocol (WORP)
WORP is a protocol, designed by Proxim to optimize the performance of outdoor wireless Point-to-Point (PtP) and
Point-to-Multipoint (PtMP) links using packet radio technology, including the use of cutting edge
Multiple-Input-Multiple-Output (MIMO) technology.
Point-to-Multipoint (PtMP) links using packet radio technology, including the use of cutting edge
Multiple-Input-Multiple-Output (MIMO) technology.
WORP overcomes the performance degradation, which standards-based wireless technologies are susceptible to when used
for outdoor long-range connectivity.
for outdoor long-range connectivity.
Benefits:
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More Net Bandwidth: WORP increases the overall net bandwidth of the multipoint system. The net bandwidth by
using WORP is higher than any other protocol solution used in an outdoor environment. WORP is a more efficient
protocol that protects the system from packet collisions and transmits the data in an optimal way, which increases the
overall performance.
using WORP is higher than any other protocol solution used in an outdoor environment. WORP is a more efficient
protocol that protects the system from packet collisions and transmits the data in an optimal way, which increases the
overall performance.
•
More Concurrent Subscribers: An outdoor point-to-multipoint solution based on 802.11 may connect from 5 to 10
remote nodes, but sometimes performance starts to suffer from collisions with as little as only 2 remote nodes. A
solution using WORP, on the other hand, can connect up to 100 remote nodes without adverse effects on usable
bandwidth, allowing more concurrent Subscriber Units (SU) to be active in a wireless multipoint environment.
remote nodes, but sometimes performance starts to suffer from collisions with as little as only 2 remote nodes. A
solution using WORP, on the other hand, can connect up to 100 remote nodes without adverse effects on usable
bandwidth, allowing more concurrent Subscriber Units (SU) to be active in a wireless multipoint environment.
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Smart Scheduling: WORP uses smart scheduling for remote node polling to avoid wasting bandwidth on nodes that
have no traffic to be sent. The Base Station Unit (BSU) dynamically decides how frequently a remote node should be
polled based on the current traffic to and from each remote node and the priority settings for that traffic. The
scheduling is adapted dynamically to the actual traffic and further optimized by following the bandwidth limits as
configured for each remote node.
have no traffic to be sent. The Base Station Unit (BSU) dynamically decides how frequently a remote node should be
polled based on the current traffic to and from each remote node and the priority settings for that traffic. The
scheduling is adapted dynamically to the actual traffic and further optimized by following the bandwidth limits as
configured for each remote node.
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Dynamic Data Rate Selection (DDRS): DDRS enables WORP to dynamically adjust the data rate at which the
wireless traffic is sent. This feature is especially important in point-to-multipoint networks, when different SUs can
sustain different data rates because of the different distances from the BSU. With DDRS, WORP dynamically optimizes
the wireless data rate to each of the SUs independently, keeping the overall net throughput at the highest possible
level. This feature optimizes throughput even for links with different RF conditions on the BSU and SU, by optimizing
downlink.
wireless traffic is sent. This feature is especially important in point-to-multipoint networks, when different SUs can
sustain different data rates because of the different distances from the BSU. With DDRS, WORP dynamically optimizes
the wireless data rate to each of the SUs independently, keeping the overall net throughput at the highest possible
level. This feature optimizes throughput even for links with different RF conditions on the BSU and SU, by optimizing
downlink.