ISDN TEW4855 U-BUS Input/Output Transformer TEW4855 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. TEW4855 meets the electrical specifications of ANSI TI.6011988 and is approved for the Mitel MT8910 DSLIC device. Applications: • High performance 2B1Q line code. • Up to 50 mA line current. • High insulation between line and equipment side. Exceeds the requirements of: EN60950 and EN41003 MECHANICAL 1 6 2 7 3 LINE DEVICE 4 DOT AT PIN #1 DIMENSIONS, Inches (mm) P/N Issue; E 97/08/25 TEW4855 .chp TEW4855 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 (1-4) (6-7) 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 11.0 mH < 75 µH < 500 pF < 3.3 Ω < 3.0 Ω 1 : 1.3 > 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 4-11