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EXHIBIT D - NORTH SLTBLT7tRAN I-NET PERFORMANCE STANDARDS Upon completion of the I-Net upgrade: I. Video Transmission A. Video transmission will comply with the following performance : standards: 1. Carrier to noise ratio = 45dB or better 2. Carrier to composite triple beat = 53dB or better 3. Carrier to compasite second order = 55 dB or better 4. Carrier to cross modulation = 55 dB or better 5. System signal level variations (peak to valley) = n= 10 + 2 or better for all coaxial cable portions of the I-Net (where N= the number of amplifiers in cascade). B. Testi.ng will occur twice yearly following the timing established in CFR 76.601 and 76.605. ' 1. From the institution to the longest subscriber cascade. 2. From the institution through the applicable headend/ hub site returning back to the same institution. 3. Performed using existing I-Net carriers active at the time of the testing, which will subject them to service interuptions. 4. Completed at Company-designated entry demarcation point at the institution. 5. The system will meet calcalated worst case fully loaded video and audio measurements, taking into consideration ezisting I-Net data loading at the time the measurement is taken. 6. Under ordinary operating conditions. 2. Digital Transmission A. For I-Net that is 50% or more coaucial cable, a Bit Error Rate of 1 x 10(-8) at the demarcation point. 1. Outage times not included 2. Ordinary operating conditions B. For I-Net that is 50% or more fiber optic cable, a Bit ErrorRate of 1 x 10(- 9) at the demarcation point. 1. Outage times not incIuded 2. Ordinary operating conditions C. For both coaidal and frber network, the company will meet or exceed a reliability factor of 99.965% on an annual basis. D. Testing will occur twice yearly, during the months of January/February and July/August.