Cellular Radio Status RSSI: 'No Signal' problem

[Görkem Polat]

Hi,

We have a Conduit AEP model with GPRS connection. Sometimes there is a problem in cellular connection. It occurs randomly, I do not know the cause.

RSSI value states ‘No Signal’.

All the CD and Signal leds on the Conduit are green. Why there is no RSSI? Anyone has an idea?

• This topic was modified 8 years, 6 months ago by Görkem Polat.

[Tim Gunn]

Gorkem

What is the RSSI value when it is working?

[Görkem Polat]

Hi Tim,

When it is working RSSI values are between -70 and -50 dBm. This indicates that there is a good signal quality, but sometimes, suddenly, it shows ‘No Signal’.

[Jonathan Brewer]

We’ve got two Conduit units with this behaviour. Full signal, but they lose and don’t re-establish their cellular connection. Very troubling.

[Jonathan Brewer]

Logging into one of these Conduit units, I see its PPP interface is not up, and doesn’t have an IP address, even though it’s got full cellular signal. It was stuck in this state for 2 days.

Nothing in /var/log/messages indicated it was trying to reestablish a cellular connection.

In /var/log/ppp_trace

7:38:2: Connecting for 0 time
7:38:5: Serial connection established.
7:38:9: IPCP: LAYER IS UP
7:38:9: PPP Established
07:38:22 PPP Rx Monitor:Started Monitoring
06:50:10: PPP Rx Monitor: Redialing…
6:50:10: IPCP: Layer is down

and in /var/log_ppp_trace0

20:3:46: Connecting for 0 time
20:3:47: Physical link failed
20:3:48: Current timing 60
20:3:48: Sleeping 58 seconds before next attempt
20:4:46: Connecting for 1 time
20:4:49: Serial connection established.
20:4:56: IPCP: LAYER IS UP
20:4:56: PPP Established
20:05:15 PPP Rx Monitor:Started Monitoring
7:37:29: IPCP: Layer is down
7:38:2: Current timing 41

It seems like there is a software bug where if the cellular connection is up but something goes wrong with the IP layer, the Multitech just sits there and does nothing. 🙁

[Jeff Hatch]

Jonathan,

Please file a support case at https://support.multitech.com/.

Jeff

[Jonathan Brewer]

For all: advice from support was to set up a reboot every 24 hours.

[Görkem Polat]

In our case it seems that it is only a GUI problem. Even if RSSI is ‘No Signal’ we have internet connection (successfully send data to the server).

[Author]

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