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This
is not exactly wat it seems like. The RSSI, I believe, should be right for what
the AP is recieving but I believe the LQ rating on the AP is queried from the
AB. If the SNMP packet (using unreliable UDP transport) gets lost or It can't
get continious readings from the AB then the calculated average will be thrown
off. The way LQ is calculated is that the AB counts the number of attempts to
send a packet and the number of successfull transmisions over a
given amount of time (2 seconds I think).
Here
is the precess:
1.
Read packets sent (PS1)
2.
Read packets ACKnolwedged (PA1)
3.
Wait 2 seconds
4.
Read packets sent again (PS2)
5.
Read packets ACKnolwedged (PA2)
6.
Calculate LQ for last two seconds
PS2 - PS1 = Total Packets sent
(PSt)
PA2 - PA1 = Total Packets
ACKnolwedged (PAt)
PAt / PSt =
LQ
OK,
this all works fine IF you can always read the stats like the AB can read it's
own stats. Now the AP has to request this information over the network using
SNMP. If any part of the requested information is lost in transit then the
numbers come out wrong. So don't rely on the numbers from the
AP.
The
RSSI may be correct on the AP. I am not sure if the AP is using the level that
it is recieving at or if this is also queried from the AB.
TO
SMARTBRIDGES: Is there any attempt in the FW to filter out missing information
from the averageing process? Where does the AP get the RSSI info about a
particular bridge?
Tom Haynes -----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of phantam Sent: Saturday, June 28, 2003 7:14 PM To: '[EMAIL PROTECTED]' Subject: RE: [smartBridges] LQ and RSSI Question I have seen this aswell
my clients have great lq and rssi but the ap shows low lq on some of them some
with even 0 L Chris From: Ray
[mailto:[EMAIL PROTECTED] How many on the list are checking
the RSSI and LQ on both the CPE /AND/ the AP when you do an
install? On our CPE side we have almost
everyone at 100% RSSI (lowest is about 80%) and LQ ranges from 65 to 100 when we
view from the CPE side. However, when we pull up the client
info on the APPO we have lots of 100% RSSI but the LQ ranges from 95% to
35%. The LQ number on the client info tab move around quite a bit and some
even drop to 0 for a few seconds. Any tips on what to look for
here? |
Title: Message
