ISDN U-BUS/DNIC Input/Ouput Transformer TEW 4229 is a DNIC interface Transformer approved by Mitel for use with their MT8972 and MT8971B/72B devices. TEW 4229 Applications: • Digital subscriber lines. • High speed data transmission over twisted wire. • Digital PABX line cards and telephone sets. MECHANICAL All dimensions are in inches ELECTRICAL TEW4229-1 DC Resistance (6-1) (2-4) (3−5) 2.25 Ω 1.00 Ω 1.00 Ω 2.25 Ω 1.00 Ω 1.00 Ω Inductance (6-1) >30 mH >30 mH Leakage Inductance (6-1) < 100 uH < 100 uH Turns Ratio pri to sec 4:1:1 4:1:1 Dielectric Strength (V rms) 2500 1500 Bandwidth (approx) TEW4229 93/02/05 Issue:C TEW4229 Filtran Limited 3 dB, 10 - 500 KHz 229 Colonnade Road, Nepean, Ontario, Canada. K2E 7K3 4-7