INTRODUCTION
The MC145474/75 ISDN S/T transceiver conforms to CCITT I.430 and ANSI T1.605 specifications. It is a layer 1 S/T transceiver designed for use at the S and T reference points. It is designed for both point to point and multipoint operation. The S/T transceiver is designed for use in either the network terminating (NT) mode or in terminal equipment (TE) applications. Two 64 kbps B channels and one 16 kbps D channel are transmitted in a full duplex fashion across the interface.