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EXHIBIT D <br />Fiber and Splicing Specifications <br />All fiber optic cable will be Corning single Mode Fiber (SMF -28) or equivalent. <br />All splicing and testing shall be performed with industry accepted equipment. Zayo shall <br />perform two stages of testing during construction of a new fiber cable route. Industry accepted <br />Optical Time Domain Reflectometer (OTDR) and Optical Power Loss tests shall be performed. <br />Spicing Standards are as follows for standard single mode fiber: <br />Splices shall be qualified during the initial construction with an OTDR from only one direction. <br />Connector (pigtail) splices shall be qualified with a 1 -km launch reel minimum. Unidirectional <br />acceptance parameters are .2 dB loss at 1550nm. <br />After end -to -end (site -to -site) connectivity on the fibers, bi- directional span testing shall be done <br />at both 1550nm and 1310nm. Spans in excess of 60kM shall be tested at 1550nm only, 1310nm <br />Testing will be omitted unless specifically requested by the customer. Test results from spans in <br />excess of 60kM will have no bearing on route or system acceptance and shall be provided as <br />information only. These measurements must be made after the splice manholes or handholes are <br />closed in order to check for macro - bending problems. Connectors shall be cleaned as necessary <br />to ensure accurate measurements are taken. <br />Installed loss measurement at 1310nm and 1550nm shall be recorded using an industry- accepted <br />laser source and power meter. Continuity testing shall be done on all fibers concurrently. Bidirectional <br />acceptance parameters are as follows: 0.20 dB at 1550nm and/or 0.25dB at 1310nm. <br />The objective loss value of the connector and its associated splice shall be 0.50dB or less. This <br />value does not include the insertion loss from its connection to the FDP. Connectors shall be <br />Ultra SC -UPC with conventional single mode glass. <br />The end -to -end loss value as measured with an industry- accepted laser source and power meter <br />should have an attenuation rating of less than or equal to the following: <br />(1) At 1310nm: (0.40 dB/km x km of cable) + (number of connectors x 0.5 dB) + (0.20 dB x <br />number of splices). <br />(2) At 1550nm: (0.30 dB/km x km of cable) + (number of connectors x 0.5 dB) + (0.20 dB x <br />number of splices). <br />All splices shall be protected with heat shrinks. An industry- accepted non- encapsulated splice <br />enclosure shall be used on all (like Alcatel WTC2, PLP Coyote, Lucent 2600, 3M 2178, <br />Tyco 450 -D or Windsor). <br />Page 17 of 17 <br />