Reply To: mapping of E1 channels 10th December 2009 at 04:56 #48298 AmmarGuest Pix, If we have 7 16kbps TRX and one 64kbps TRX then how we can calculate by this formula # of Abis TS = 2.25 x # of TRX Does we take no of TRX 7 or 8