I'm trying to set up a simple "wall wart" WiFi extender, a DLink DAP-1520. The setup is straight forward enough, but there seems to be no option for choosing a channel/frequency, so the extender will compete for bandwidth with the main AP. Is this normal? I would expect it to avoid the frequency used by the main AP. Am I missing something?
For context, I have been trying to learn a bit about extending WiFi networks (my expertise starts above TCP, I'm a bit lost when it comes to the lower layers). As far as I understand, the DAP-1520 is not a repeater. It's an AP with a second WiFi device that it uses to connect to the main AP. At least, that's what I gather from the fact that the configuration wants me to specify an SSID and password for the back-haul as well as for the extender itself. And they suggest to pick a different SSID. (Edit: the extender supports 2.4 OR 5 GHz for the back-haul, and dual 2.4 AND 5GHz for the use by clients).
Using the same frequency in this arrangement doesn't make sense top me. So I have a few questions:
- Does a repeater necessarily re-transmit on the same frequency? Why would it not be possible to re-transmit on a different frequency?
- Does a repeater need a WiFi password?
- When setting up multiple APs, should the all operate on different frequencies? Especially if they use WiFi for the back-haul? Why would an extender be hard coded to operate on the same frequency?
- When setting up multiple APs, should they all share the same SSID? If not, why not? Why would the instructions for the DAP-1520 suggest using a different SSID?
I have read How does a WiFi range extender work?, but it doesn't really help with my confusion...