ISDN TEW5318 U-BUS/DNIC Input/Output Transformer TEW5318 is designed to interface with the subscriber premises (NT) and the 2-wire line side of the central office equipment (LT) in the ISDN system. Features: TEW5318 meets the requirements for the Mitel MT8972 and MT8971B/72B devices. TEW5318-1 is supplied with a “Flux-band” for additional cross talk suppression. • Low profile construction. • Handles 100 mA unbalanced line current. MECHANICAL 1 6 2 7 3 DEVICE LINE 4 DIMENSIONS, Inches (mm) DOT AT PIN #1 P/N TEW5318 Issue: A 94/12/14 TEW531.chp8 ELECTRICAL SPECIFICATIONS Line Impedance L W H A 0.025 (0.64) TEW5318 TEW5318-1 135 Ω 135 Ω 30 mH 30 mH Leakage Inductance (short 2-3 & 1-4) (6-7) 95 µH 95 µH Winding Resistance (1-2) + (3-4) 3.5 Ω 3.5 Ω (6-7) 6.5 Ω 6.5 Ω 4:1:1 4:1:1 100 mA 100 mA 1500 V rms 1500 V rms no yes DC Capability (Line Side) Dielectric Strength Flux-band provided Filtran Limited (1 - 4) S 0.87 0.83 0.63 0.60 0.20 0.12 (6-7) (6-7):(1-2 ):(3-4) C (22.0) (21.0)(16.0)(15.3) (5.1) (3.0) Inductance Turns Ratio B 229 Colonnade Road, Nepean, Ontario, Canada. K2E 7K3 Tel : (613) 226-1626 Fax : (613) 226-7124 4-17