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EXHIBIT D - NORTH SUBLTT_2BAN I-NET PF,RFORMANCE STANDAR1)S Upon completion of the I-Net upgirade: 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 composite 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 cowual cable portions of the I-Net (where N= the number of amplifiers in cascade). B. Testing 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, wtuch will subject them to service interuptions. 4. Completeci at Company-designated entry demarcation point at the institution. 5. The systern will meet calcnlated worst case fully loaded video and audio mea.surements, taking into consideration existing I-Net data loading at the time the measurement is taken. 6. Under ordGnary operating conditions. 2. Digital Transmission A. For I-Net that is 50% or more coaxial cable, a Bit Error Rate of 1 x 10(-8) at the demarcation point. 1. Outage tunes not included 2. Ordinary operating conditions B. For I-Net that is 50% or more fiber optic cable, a Bit Error Rate of 1 x 10(- 9) at the demarcation point. 1. Outage thnes not included 2. Ordinary operating conditions C. For both coaxial ;and fiber network, the company will meet or exceed a reliability factor of 99.965% on an annual basis. D. Testing will occux twice yearly, during the months of January/February and July/August.