Brocade Mobility RFS Controller System Reference Guide (Supporting software release 5.5.0.0 and later) - Manual (Page 991)

Brocade Mobility RFS Controller System Reference Guide 979
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The RF Quality Index area displays the following information:
WMM TSPEC
Wireless Client Statistics
The 802.11e Traffic Specification (TSPEC) provides a set of parameters that define the
characteristics of the traffic stream, (operating requirement and scheduling etc.). The sender
TSPEC specifies parameters available for packet flows. Both sender and the receiver use TSPEC.
The TSPEC screen provides information about TSPEC counts and TSPEC types utilized by the
selected wireless client.
To view the TSPEC statistics:
Rx Errors Displays the errors encountered by the client during data transmission. The higher the error rate, the
less reliable the connection or data transfer between client and connected Access Point.
Rx Actions Displays the number of receive actions during data transmission with the client’s connected Access
Point.
Rx Probes Displays the number of probes sent. A probe is a program or other device inserted at a key juncture in a
for network for the purpose of monitoring or collecting data about network activity.
Rx Power Save Poll Displays the power save using the Power Save Poll (PSP) mode. Power Save Poll is a protocol, which
helps to reduce the amount of time a radio needs to powered. PSP allows the WiFi adapter to notify the
Access Point when the radio is powered down. The Access Point holds any network packet to be sent to
this radio.
RF Quality Index Displays information on the RF quality of the selected wireless client. The RF quality index is the overall
effectiveness of the RF environment as a percentage of the connect rate in both directions as well as the
retry rate and the error rate. The RF quality index value can be interpreted as:
•
0 – 20 (Very low utilization)
•
20 – 40 (Low utilization)
•
40 – 60 (Moderate utilization)
•
60 and above (High utilization)
Retry Rate Displays the average number of retries per packet. A high number indicates possible network or
hardware problems.
SNR Displays the connected client’s signal to noise ratio (SNR). A high SNR could warrant a different Access
Point connection to improve performance.
Signal Displays the power of the radio signals in - dBm.
Noise Displays the disturbing influences on the signal in - dBm.
Error Rate Displays the number of received bit rates altered due to noise, interference and distortion. It’s a unitless
performance measure.
MOS Score Displays average voice call quality using the Mean Opinion Score (MOS) call quality scale. The MOS
scale rates call quality on a scale of 1-5, with higher scores being better. If the MOS score is lower than
3.5, it’s likely users will not be satisfied with the voice quality of their call.
R-Value R-value is a number or score used to quantitatively express the quality of speech in communications
systems. This is used in digital networks that carry Voice over IP (VoIP) traffic. The R-value can range
from 1 (worst) to 100 (best) and is based on the percentage of users who are satisfied with the quality of
a test voice signal after it has passed through a network from a source (transmitter) to a destination
(receiver). The R-value scoring method accurately portrays the effects of packet loss and delays in digital
networks carrying voice signals.
Refresh Select the Refresh button to update the screen’s statistics counters to their latest values