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EXHIBIT D NORMSUBURRAN I-NET ' ,A,,i Upon completion of the I-Net upgrade: 1. Video Transmission A. Video transmmsion will comply with the following performance standards: 11 Carrier to noise ratio=45 dB or better 2. Carrier to composite triple beat=53dB or better 3. Carrier to composite second order—55 dB or better 4. Carrier to cress modulation =55 dB or better 5. System signal level variations (peak to vauey)= n + 10 +2 or better for all coaxial cable portions of the I-Net(where N =the number of ampllers in cascade). B. Vesting will occur twice yearly follovn*ng the timing established in CFR 76.601 and 76.605. 11, 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 ensting I-Net carriers active at the time of the testing,which will subject them to service interuptio ns. 4, Completed at Company-designated entry demarcation point at the institution. 5* The system will meet calculated worst case fully loaded video and audio measurementsi taking into consideration existing I- et data loading at the time the measurement is taken* 6. Under ordinary operating conditions. 2. Dtgi#al Transunission A. For I-Net that is 50% or more coaxial cable, a Bit Error Pate of 1 x 10(-8) at the demarcation point 11 Outage times not included 21 Ordinary operating conditions B. For I-Net that is 50% or more fiber optic cable, a Bit Error-Rate of I x 10(- 9) at the demareation point 1. Outage times not included 2. Ordinary operating conditions C. For both coaxial and fiber network the company will Meet or exceed ; reliability factor of 99.965% on an annual basis. D. Testing will occur twee yearly, during the months of January ebruary and July/August.