default BLE channel frequency

[john.ashok]

Hi team,

I would like to know the default channel used for data transmission and the frequency of the channel.

Also whether the frequency is configured in the softdevice?

I m using softdevice s140 and nrf52840 

[Kenneth]

Hi,

I am not sure if I understand the question. A BLE link is initiated when there is a CONNECT_REQ packets sent from a central device to a peripheral device that is advertising. The CONNECT_REQ packet contain information about the channel map and channel hop, the conneciton interval and other connection parameters. There is no static or default frequency that I can see here.

Kenneth

[john.ashok]

Then does this mean central device takes care of the channel frequency?

actually i want confirm that we are not using the frequency channel starting exactly at 2.400 GHz but rather 2.402 GHz and onwards 

how to confirm this or is there a way to configure this?

[Kenneth]

The channels are defined by Bluetooth core specifications, and are channels between 2402-2480, in 2MHz steps, as shown in a figure on this page:
https://devzone.nordicsemi.com/nordic/short-range-guides/b/bluetooth-low-energy/posts/bluetooth-smart-and-the-nordics-softdevices-part-1 

[john.ashok]

thanks for the info