Modem Coupling Transformer Turns Ratio ( + 3 % ) 1 :1 PARAMETER MIN. Primary Inductance TYP. MAX. UNITS Schematic Diagram (1) 12 H Pins 1-2. PRIMARY Primary DC Resistance 97.2 108 118.8 ohms 108 120 132 ohms Pins 1-2 Secondary DC Resistance SECONDARY 1 4 2 3 Pins 4-3 Isolation (Hi-Pot) 1250 Frequency Response 200 Hz to 4 KHz -0.25 VAC +0.25 dB Return Loss 300 Hz to 3000 Hz 20 dB Longitudinal Balance: 200 to 1000 Hz 1000 to 4000 Hz 60 60 dB dB Insertion Loss 1.75 2.0 Total Harmonic Distortion at 600 Hz, -10 dBm 2.25 88.1 dB Physical Dimensions dB inches (mm) .750 (19.05) 3 4 1.05 (26.67) MAX. 2 2 1.03 (26.16) MAX. .450 (11.4) 1 3 Bottom View 1 4 .550 (14.0) Freq -10dBm 0 dBm +4.7 dBm 300 Hz -83 dB -81 dB -77 dB 600 Hz -86 dB -85 dB -84 dB RHOMBUS P/N: T-1076 CUST P/N: DATE: 05/19/98 Rhombus Industries Inc. Transformers & Magnetic Products NAME: SHEET: 1 of 1 15801 Chemical Lane, Huntington Beach, CA 92649 Phone: (714) 898-0960 FAX: (714) 896-0971 www.rhombus-ind.com