Hai. HDLC is the protocol used between L1 and L2 regards, Altaf -- View this message in context: http://baseband-devel.722152.n3.nabble.com/little-confusion-while-studying-l1l2-interface-via-sercomm-tp4025106p4025110.html Sent from the baseband-devel mailing list archive at Nabble.com.