ISDN TEW4897 U-BUS Input/Output Transformer TEW4897 is designed to interface with the subscribers premises (NT) and the 2- wire line side of the Central Office Equipment (LT) in the ISDN Network. Applications: TEW4897 meets the electrical requirements for the SIEMENS PEB20902/IEC (4B3T) device. • Low profile construction. • Up to 50 mA line current. • High insulation between line and equipment side. Exceeds the requirements of: EN60950 and EN41003. MECHANICAL 1 6 2 DEVICE LINE 7 3 4 DOT AT PIN #1 DIMENSIONS, Inches (mm) P/N Issue; D 97/08/25 TEW4897.chp TEW4897 L W H A B C S 0.87 0.83 0.63 0.60 0.20 0.12 0.025 (22.0) (21.0) (16.0)(15.3) (5.1) (3.0) (0.64) ELECTRICAL Line Impedance Inductance Leakage Inductance (6-7) (6-7) Distributed Capacitance Winding Resistance Turns Ratio Longitudinal Balance DC Capability (Line Side) Dielectric Strength Filtran Limited (1-4) (1-4) (6-7) (6-7) : (1-4) 1 - 4 KHz 4 - 160 KHz 150 Ω > 3.7 mH < 12.5 µH < 110 pF < 2.5 Ω < 1.74 Ω 1 : 1.32 > 60 dB > 55 dB 50 mA 4000 V rms 229 Colonnade Road, Nepean, Ontario, Canada. K2E 7K3 Tel : (613) 226-1626 Fax : (613) 226-7124 4-12