www.DataSheet4U.com CEPT/T1 TEW5736 is designed to be used, either as a transmit or as a receive transformer in the ISDN primary rate access network, interfacing the Siemens PEB2235 and PEB2236 devices Complies with ANSI T1.408 and CCITT I.431, with regards to Longitudinal Balance and with T1.408 and G.703 for the return Loss. When in transmit mode, connect the two primary windings in parallel, pin 2 to 3 and pin 5 to 4. Input/Output Transformer When in receive mode, connect the two primary wi.