TEW5736 is a transmit or receive transformer designed for use in the ISDN primary rate access network, interfacing the Siemens PEB2235 and PEB2236 devices. It complies with ANSI T1.408 and CCITT I.431 standards, with regards to Longitudinal Balance and with T1.408 and G.703 for the return Loss. When in transmit mode, the two primary windings should be connected in parallel, pin 2 to 3 and pin 5 to 4. When in receive mode, the two primary windings should be connected in series, pin 5 to pin 3. Typical applications include primary rate ISDN network nodes, PBX or computer to T1/CEPT Digital Trunks, and TDM Multiplexers.