www.DataSheet4U.com DS2155 T1/E1/J1 Single-Chip T.
DS21552 - T1 Single-Chip Transceivers
DS2155 - T1/E1/J1 Single-Chip Transceiver TDM/UTOPIA II Interface
DS21352 - 3.3V DS21352 and 5V DS21552 T1 Single-Chip Transceivers