I’m having an issue with a short backhaul link of about 931 feet. We are constantly getting 3% packet loss over this link. I thought the problem was with my backhaul on the upstream end. Swapped it out RSSI went from 300 to 1000 and jitter dropped from 5 to 1. I assumed I had corrected the problem but I’m still getting the packet loss. Both BH’s are running 8.2.7. Link tests come back 100/100. What could be causing the 3% packet loss??
Check your ethernet stats page for any errors.
Ethernet Control Block Statistics
Ethernet Link Detected : 1
Ethernet Link Lost : 0
Undersized Toss Count : 0
inoctects Count : 142610670
inucastpkts Count : 815276
Innucastpkts Count : 37752
indiscards Count : 0
inerrors Count : 9
inunknownprotos Count : 0
outoctets Count : 836804843
outucastpktsCount : 973401
outnucastpkts Count : 23363
outdiscards Count : 0
outerrors Count : 0
RxBabErr : 0
TxHbErr : 0
EthBusErr : 0
CRCError : 8
RcvFifoNoBuf : 0
RxOverrun : 1
LateCollision : 0
RetransLimitExp : 0
TxUnderrun : 0
CarSenseLost : 0
What is the dB level at each end? You may be overloading the RF receiver on one or both ends. Try reducing the Tx power on both ends and see if the link stabilizes.
Alos, try forcing both radios and the devices they are connected to 100FDX
How about the other sides ethernet stats?
You can also try forcing the Ethernet speed to 10F or 10H and check.
Can you narrow down where the loss is coming from?
Say we have A------B~~~~~~~C-------D
A being local router or PC. B & C being the BH radio’s and D being another PC or router.
From A do a flood ping test to B, C and D. This should help you narrow down where the issue is.
Ethernet Link Detected : 1
Ethernet Link Lost : 0
Undersized Toss Count : 0
inoctects Count : 1921272199
inucastpkts Count : 11433436
Innucastpkts Count : 617763
indiscards Count : 0
inerrors Count : 1
inunknownprotos Count : 0
outoctets Count : 1980108706
outucastpktsCount : 9047017
outnucastpkts Count : 136921
outdiscards Count : 0
outerrors Count : 0
RxBabErr : 0
TxHbErr : 0
EthBusErr : 0
CRCError : 0
RcvFifoNoBuf : 1
RxOverrun : 0
LateCollision : 0
RetransLimitExp : 0
TxUnderrun : 0
CarSenseLost : 0
No Carrier : 0
First ehternet stats posted were from the master.
the ones above are from the slave.
dB levels are around -55 at each end
A------B~~~~~~~C-------D
the first packet loss detected is at C which is the master.
Both sides are set to generate their own sync. Could that cause an issue?
Both BH’s need the same sync. Use a 6 pin jumper and connect the RJ11 pins 1 and 6 from the 1st link BH slave to the 2nd link BH master.
Set the 1st link BH master to generate sync, and set the 2nd link BH master to receive sync on timing port.
Set both masters with the same DL% and control slots.
If you have AP’s in the same band then you need GPS sync on all AP’s and BH masters.
Time to read the manual…
I’m not sure what your talking about Jerry there is no first and second link.
Just one.
I thought there were two BH links as you said both ends are generating their own sync - only masters generate sync.
Do you have any AP’s in the same band? Have you done a spectrum analysis of the area?
Is this 2.4, 5.2, 5.4, or 5.7HGz?
sorry didn’t mean to confuse you. Ok so we are dealing with 1 link between a 5.2 Ghz backhauls. I do not have any AP’s running in the same band. I have ran a spectrum analysis of this area and everything seems fine
OK - most likely an Ethernet issue. Have your re-terminated the ends and tried new power supplies?
Try connecting a laptop to each end and ping across to isolate if the problem is the link or the devices they are connected to.
It s definitely the link Jerry. If I go to the other end i can ping the backhaul there fine without loss. If i try to ping back across the link I get packet loss again. So not sure what is going on here. Everything worked great up until a couple weeks ago. Nothing has changed on either end. I stumped!
Do you get this ping loss when the llink is under load (passing traffic) or even when it is idle?
Are these P9 or P10?
Have you tried lowering the Transmit power from 23 to about 10db?
where do i lower the transmit power?? where is that setting?
It is in the Configuration > Radio tab.
What about my other questions?
i have no option to change power level on the radio tab.
The slave is a p10
the master a p9
Don’t you see Transmitter Output Power at the bottom?
Have you tried swapping which radio becomes Master?
WHAT ABOUT MY QUESTION ABOUT WHETHER THE ISSUE IS ONLY WHEN THE RADIOS ARE UNDER LOAD OR NOT…
under load or idle it doesn’t matter. still packet loss
Thanks for all the ideas guys. Finally resolved the problem by relocating the Backhaul to another part of my building. It was definitely an interference issue from something!
where you shooting over the top of a metal building?