Device Offline

The alert is raised when a device which previously communicated has gone offline. The default duration of silence is currently configured at 1 hour.

The alert is recurring, because it indicates a grave situation which requires immediate attention. Currently the recurring frequency is once per day. The user can change this frequency to once a week or even once a month. This is useful when user is aware that device is offline (i.e. sent for repairs) and doesn’t want to be bothered every day.

If device stays offline for a very long period, the alert will be no longer raised. Currently this will happen after one month of silence.

Temperature Exceeded

The alert is raised when PCB temperature exceeds the configured value, currently 75°C.

The alert is recurring, because it indicates a grave situation which requires immediate attention. Currently the frequency is once per day.

Band Shut Down

The alert is raised when one or more device bands have been automatically shut down. A particular band will only remain shutdown for a maximum period of 24 hours. This is because the repeaters/lineAMps all rebalance every 24hours. If the automatic shut down event is recurring every day, then the alert will get raised every day.

Sustained Reduced Power

The purpose of this alert is to detect sustained drop of power on one or more bands.

To establish such event, we can’t rely on momentary values, as these can fluctuate quite a lot. It is important, that the drop is sustained. Therefore Alert Monitor stores and observes averages of recently reported values.

These averages are compared against what is regarded as normal average value for each band. Before checking the device for this alert, we need to establish what’s normal. This is highly individual, and computed separately for each device.

Calculating the average values begins when the device first comes online. The values are collected only during hours of normal activity, between 09:00 and 17:00 at device owner’s local time. Otherwise the normal averages might be distorted when there’s less or no activity at night. Effectively, for a device communicating at a typical 10 minutes frequency, we collect 144 values spread over a few days.

Once the normal average values have been established, Alert Monitor starts collecting recent values and stores them. Once we have collected 144 values of these, the alert can be checked. Whenever another device status arrives, Alert Monitor checks whether rolling average of each band has dropped below the normal. If it did, and drop is greater than the configured level (20dB), the alert is raised for this band.

The alert is recurring.

Device Rebooting

The alert is triggered when device has rebooted too many times within a short period. We monitor both software reboots and hardware reboots(mains power lost and returned), which are indicated with a distinct alert message.

Under current configuration the alert will be triggered when the number of reboots exceeds 10 during the last 24h.

The alert is not recurring.

Feedback (FB) on Band

The FB alert is only available on the following hardware boards For repeaters: 9/10 For LineAmps: 5/6 FB is when there is an oscillation between the outdoor and indoor antenna. When this happens, attenuation is automaticaly applied to the band. The “Feedback” status message will appear on the LCD, and an alert will be logged. The installer should create more isolation between the antennas in this case. The alert is raised when one or more bands report FB.

The alert is not recurring.

Reduced Gain Alert (RG)

The RG alert is only available on the following hardware boards For repeaters: HW: 4/6/6b For LineAmps: HW: 1/3 If there is a stong downlink pulse detected, attenuation is automatically added to the band for an extended period*. We called a Reduced Gain event. If this event results in the max downlink signal strength reduced to lower than -15dBm (4 signal dots), then this alert will be logged, and on the device page, the status bar will register “Reduced Gain”. The maximum values in the parameters box on the device page are denoted in orange colour. These max values get reset every 10 minutes. So for this alert to be logged, the max DL signal strength needs to remain under 4 signal dots (-15dBm) for at least 10 minutes. To resolve this potential issue, first, the device should be checked. Adding some manual attenuation to the band can help in some circumstances to stop this event from happening and therefore the band signal level can be improved. However, it is important to note that it is not allways possible to stop this reduced gain occuring on these HW boards. THe hardware was improved in later models to deal with this situation.

*Repeaters and LineAmps reset every 24 hours. The alert is not recurring.

Alert triggered when device shows too much uplink activity at times when it should remain silent.(nighttime)

The alert is applicable only when:

-Device is a repeater

One of the cases when this alert can be useful is detection of activity in offices during the night time hours. There is usually nobody inside the office using their phones during these night time hours. If we detect a lot of uplink activity, this might mean two things:

-Someone has access to the building who should not be there. -The device has picked up an unwanted signal sourse and is repeating it.

To detect the alert, we use “sliding” parameter, which indicates the percentage of time during which the band showed uplink activity, since the previous status message. Alert Monitor collects these values, calculates an average and raises alert when the average exceeds the configured threshold, currently 98%.

The alert is monitored only within one 24h contiguous specified period. By default we monitor the period between 00:00 a.m. and 6:00 a.m. It is important to remember that the time schedule follows the device owner’s timezone. If device owner is in CET zone, from Dublin GMT perspective the observed time will be thus between 23:00 - 05:00.