3NT5K02 and NT8D03 Analog Line Cards 553-3001-161DescriptionNT8D03 Analog Line Card (μ-Law)The NT8D03 Analog Line Card provides talk battery and signaling forregular 2-wire common battery 500-type (rotary dial) and 2500-type(Digitone dial) telephones and key telephone equipment.The analog line card interfaces to and is compatible with the equipmentlisted in Table 1.Table 1NT8D03 Analog Line Card application and compatibilityEquipment Spe cifica tions500-type rotary dial telephones:dial speedpercent breakinterdigit time8.0 to 22.5 pps58 to 70%150 ms2500-type Digitone telephones:frequency accuracypulse durationinterdigit timespeed+ 1.5 %40 ms40 ms12.5 digits/s