Problems with AP and SM

We have problems with stabile work of AP and some of SM’s. Our Clients claim, that SM have some breaks. Particullary the VoIP gates (at the client’s side) have many hang-ups and they shoud be restart with power supply. We testing AP and SMs pinging them continously (we have an application for it) and we record that many of tested elements have a packet drops with duration from a few seconds up to a few minutes. PRIZM don’t show that situations - we have set a testing period to 5 minutes.
Is it a good method for testing Canopy equipment? Is it propper bahaviour of AP and SMs?
Is anybody detected such situation in his system?

Thanks for all suggestions.

Ptysiek - Krzysiek


Are you monitoring the AP’s or the SM’s for packet loss?

If you are monitoring the AP’s I would monitor the elements between you and them, i.e. Backhauls, Switches, Routers.

The hardest thing I have getting through my support folks head is just because one customer is dropping it might be something much larger that we have not seen yet, we too monitor using Nagios in 5 minute intervals, so sometimes we have to use other applications Multiping, MTR etc to see realtime results.

If it is specifically the SM’s, what does the stats page show for Registration Counts, if the Rereg count is high then there is either interference or something obstructing the path/Fresnal Zone.


Ping is an unreliable method of monitoring. If a link is flooded pings will not get through.

The proper method for monitoring is to use SNMP. I recommend monitoring the following

- Ethernet Interface
- Registered SM’s
- Latency

- Ethernet Interface
- Jitter
- dBm
- Latency

Tkanks friends for an information.
I have additional question to You, Jerry. How do You test your equipment with SNMP. Give me, please, some more details. It can be at my e-mail, not neccesary via Community.

Thanks for any help.

You can monitor SNMP information using CactiEZ. Nagios also can track and alert based on SNMP information.

CatiEZ is a pretty nice tool and is free.

We migrated to PRTG as I wanted to be able to view the system with my PDA. If you go this route, I recommend that you create several logins, each showing a limited number of devices as it makes the pages load more quickly.

More on SNMP here: … t_Protocol

PRTG looks interesting. I manage a few wireless networks and they all have Nagios boxes on them. It’d be nice to have a less bulky page for my AT&T Sync phone web browser… Data plans are not cheap! :wink: