Greetings Mr. Enno:
As the name suggests,
adjacent channel power is the amount of power a
transmitter allows to "bleed" into the channel just
above and below it. Lower ACPs are always better,
because it means you are not as likely to interfere
with a co-existing system trying to operate in the
same frequency space.
Here is an illustration
that uses co-existence of Zigbee with WiFi. Bluetooth
could also be added to the picture because like
ZigBee, it uses a frequency-hopping spread spectrum
scheme.
https://www.xbow.com/Products/Product_pd ... erence.pdf
- Kirt Blattenberger