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Local RSSI:
A relative measure of power received by the radio currently
•
logged into. This is the measure of the remote unit's transmit power as
received by your unit.
At 36 Mbps, the RSSI should be at least 20. For higher data rates, the RSSI
must be higher to support reliable operation. At lower data rates, the RSSI can
fall below 20 and still maintain a reliable link. A sample of minimum RSSI levels
needed is provided below:
Minimum RSSI at different data rates
36 Mbps
72 Mbps
108 Mbps
Signal Level: A graphical representation of RSSI.
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Local Statistics
Valid Data: Total number of data frames received and sent by the unit.
•
Valid mgmt: Total number of management frames received and sent by the
•
unit
Errors: total number of error frames recorded by the unit.
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Local Rx Statistics
CRC Errors: A wireless PHY layer statistic - specifies the number of frames
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rejected at the PHY layer of the radio receive chain.
Local Tx Statistics
Discarded Frames: A wireless MAC layer statistic - specifies the number of
•
frames for which the transmitting radio did not receive acknowledgment from
the receiving radio. There are many possible reasons including an RF path
problem, interference, defective receiver, etc.
The transmitting radio will try twice to send a frame. If both attempts result in
failure, the radio will "discard" the frame and rely on higher layer protocols to
request a retry.
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13. Quality of Service (QoS)
For the transport of real-time data, such as VoIP or streaming video, the
SkyWay 7000 contains a QoS system providing end-to-end prioritization of pre-
tagged Ethernet and IP frames.
The QoS system relies upon the originating network device/appliance to tag
frames using one of the following standards:
a.
802.1p VLAN tag
b.
IP ToS field
c.
IP Diffserv field
As a frame enters the SkyWay 7000, a line speed tag inspection is performed
and frames are prioritized as follows:
a.
A priority queuing method assigns tagged frames to one of the 4 priority
queues, allowing higher priority data to then be pushed onto the RF stack
ahead of lower priority frames.
based on the following tag matrix-
Voice
Tag Method
802.1p
0x6
0x7
ToS/Diffserv
0x30
0xe0
b.
Once on the RF stack, the RF MAC gives prioritized frames early access to
the 'air' resulting in the frames being delivered sooner to the receiving
radio.
Notes:
The QoS system does not add or alter priority tags
•
QoS is always 'enabled.'
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For best results, all network devices (switches, routers, gateways)
•
between source and destination devices should be QoS aware.
Tagged frames are assigned to queues
Video
Normal
Background
0x3
0x0
0x1
0x4
0x2
0x5
0x28
Default
0x08
0x88
0x20
0xa0
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