Info on Energy detection scan in Zigbee

[divyak]

Hi,

I am using FRDM-KW40Z Zigbee.

During the energy detection scan, I get a 8bit value. how can I translate it to dB?

Is 25% a good threshold value for the energy during an energy detection scan?

[zigbee1]

Here after is exactly what I getting from several router connected to the Zigbee controller. The information is collected via Mgmt_NWK_Update_notify message data.

Per channel, I'm so getting a value between 0 and 0xFE (while 0xFF stand for indicates there is too much interference on the channel as per the ZigBee PRO Stack documentation)

 Network Energy Level Report
 -----------------------------------------------
 nwkid     Tx  Failure   11   15   19   20   25   26
  ca62     40        0  171  172  162  161  179  175
  2d25     43        0  175  194  168  165  176  196
  f775     32        0  187  183  164  170  177  187
  9596     36        0  192  196  171  163  175  202
  eb73     30        0  180  184  161  170  180  187
  fc80     24        0  191  185  169  162  178  191
  83c2     23        0  204  210  205  206  190  207
  1f33     33        0  174  188  172  167  179  188
  0fc4     40        0  175  179  172  174  166  177
  aa38     28        0  187  189  180  177  179  191

Question:

- How to interprate those result. Should the reported energy-level measurements be as lower as possible to report a better channel or vice-versa ?

- Can we convert this reported energy-level measurements into db ?

I'm using JN5168

[mario_castaneda]

Hi Patrick,

Could you please provide more details about this?

What is the device that you are using? and how are you measuring this? 

Regards,

Mario

[mario_castaneda]

Hi Divya,

Did you mean 802.15.4? The KW40z doesn't support Zigbee.

dBm and RSSI are different units of measurement that both represent the same thing: signal strength. The difference is that RSSI is a relative index, while dBm is an absolute number representing power levels in mW (milliwatts).

Could you provide for information about your final application?

Hope it helps

Mario