www.DataSheet4U.com CEPT /T1 TEW5915 is designed and approved to be used as a Receive Transformer in T1 and CEPT applications, with the following devices: Dallas PMC -Sierra AT&T Level -One DS2187 PM4341 T1X PM6431 E1 T7290 LXT304A, 305A Input Transformer Typical applications are: Wide temperature range. Primary rate ISDN network nodes. PBX or computer to T1/CEPT Digital Trunks. TDM Multiplexers. TEW5915 MECHANIC.