DOCA0172EN-13

Appendix C: Wireless Device Network Indicators

The following table describes the network indicators of wireless devices.

Information type Description

RSSI

Displays the power level of the wireless signal.

  • Good: 0 to -65 dbm

  • Average: -65 to -75 dbm

  • Poor (with risk of outage): < -75 dbm

LQI

Displays the measurement of the strength and/or the quality of the received frames.

NOTE: It is recommended to use this indicator as the main indicator of acceptance.

PER

Displays the ratio of the packet that does not reach a destination over the total expected number of packets. It is expressed as a percentage.

The calculation of the PER (packet error rate) indicator depends on the type of indicator:

  • Device indicator: provided by the device.

  • Panel Server indicator: calculated over a 10-minute sliding window, and refreshed every 30 seconds.

  • Link indicator: displays the higher of the two previous indicators.

QR Code is a registered trademark of DENSO WAVE INCORPORATED in Japan and other countries.

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