ISDN TEW4840 U-BUS Input/Output Transformer TEW4840 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. TEW4840 meets the electrical specifications of ANSI TI.6011988 and is approved for the SIEMENS PEB2091 (V.C1) device. Applications: • High performance 2B1Q line code. • Up to 50 mA line current. • High insulation between line and equipment side. Certified to: EN60950 & EN41003 MECHANICAL 1 DEVICE 6 2 7 3 LINE 4 DOT AT PIN #1 DIMENSIONS, Inches (mm) P/N TEW4840 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) Issue; D 93/01/29 TEW4840 ELECTRICAL Line Impedance Inductance Leakage Inductance (1-2)+(3-4) (1-2)+(3-4) Distributed Capacitance Winding Resistance (1-2)+(3-4) (1-2)+(3-4) (6-7) (6-7) : (1-2)+(3-4) 1 - 4 KHz 4 - 160 KHz Turns Ratio Longitudinal Balance DC Capability (Line Side) Dielectric Strength Filtran Limited 135 Ω 14.5 mH < 55 µH < 187 pF < 3.0 Ω < 3.0 Ω 1 : 1.6 > 60 dB > 55 dB 50 mA 4000 V rms short (6-7) 100 mA without damage 229 Colonnade Road, Nepean, Ontario, Canada. K2E 7K3 Tel : (613) 226 1626 Fax : (613) 226 7124 4-10