ISDN U-BUS Input/Output Transformer The TPW4670 transformer 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. TPW4670 TPW4670 meets the electrical specifications of ANSI TI.6011988 and is approved for the Siemens PEB2091 device. TPW4670-1 meets the requirements of the Thomson SD5411 device MECHANICAL Dot at pin 1 TPW4670.chpcs ELECTRICAL Line Impedance Inductance ISSUE: F 98/02/02 Leakage Inductance Winding Capacitance Turns Ratio Longitudinal Balance DC Capability (Line Side) Dielectric Strength Filtran Limited TPW4670 TPW4670-1 135 Ω 135 Ω (5-7)+(6-8) 14.5 mH 14.5 mH (2-11) < 55 µH < 55 µH (5-7)+(6-8) < 80 pF < 80 pF (2-11) : (5-7)+(6-8) 1 : 1.6 1 - 4 KHz 4 - 160 KHz > 65 dB > 58 dB > 65 dB > 58 dB 50mA 50 mA 2000 V rms 229 Colonnade Road, Nepean, Ontario, Canada. K2E 7K3 Tel : (613) 226 1626 Fax : (613) 226 7124 1 : 1.5 2000 V rms. 4-8