[amsat-bb] why AX.25 packet standard in Amateur satellite

Dear All

I come to know AX.25 packet standard is being used in some satellite .while satellite which I used to take pass funcube-1 does not require ax.25 depacketizer.

I am confused what is the requirement for ax.25 encoding /decod in telemtry or in telecommand or in both

what is the significance of using ax.25 in satellites .why we require this .

any help and details.

My rig icom 9100 does not do ax.25 packet decoding. I come to know TNC will be required. but we have hardware as well as software TNC. which to use.

any help

regards

Shakeel