www.DataSheet4U.com T1/CEPT TEW5921 CEPT/T1 Input/Output Transformer Input/OutputTransf. Surface Mount TEW5921 SMD-6 2-63 TEW5921 is designed to be used as a Transmit and Receive transformer in the ISDN primary rate access network with the following devices: Siemens PEB2254 Applications Primary rate ISDN network nodes PBX or computer to T1/CEPT Digital Trunks. TDM Multiplexers. 5921 MECHANICAL Top view 5 1 2 C.T. 5 3 1 6 4 2 6 TEW5921 4 Di.