15th November 2007 at 14:52
#49618
Keith
Guest
Pix, Many Thanks, that helps a lot.
I also notice the A-bis protocol includes cyphering commands to protect the air interface. Is the cyphering done on the BSC or the BTS nodes? That is , is the speech within the TRAU frames in clear channels on the A-bis interface and then cyphered/decyphered on the BTS?