Common use of OTDR TESTING Clause in Contracts

OTDR TESTING. This testing will be conducted at both 1310 nm and 1550 nm wavelengths when the Leased Fiber consists of Standard Single Mode Fiber, but will be done at 1550 nm only if the Leased Fiber consists of either Dispersion Shifted Fiber (True-WaveTM, LEAFTM, etc.) or a combination of Single Mode and Dispersion Shifted fiber types. OTDR testing will be conducted on a bi-directional basis for each Leased Fiber in each span at the appropriate wavelengths for the Leased Fiber described above. However, if due to length or attenuation reasons that the Leased Fiber span exceeds the dynamic range of an OTDR, a portion or the entire span may be tested on a unidirectional basis only. Alternatively, the Leased Fiber span may be divided into shorter testing spans, to the extent reasonably possible, in order to obtain bi-directional analysis. Also, in instances where a Customer intends to accept Leased Fiber that is not terminated at one end by MFN in a fiber distribution panel (such as in a manhole or handhole) only unidirectional testing will be performed. The turnover documentation package delivered to Customer will contain the actual traces that detail the testing parameters (including pulse width, averaging and range). The average bi-directional splice loss for all splices within each span will be of 0.15 dB or less while each connector pair (such as at a FDP) will have an average bi-directional loss of 0.5 dB or less. (Note that the front and end connector of the span can only be measured uni-directionally and will also have a loss equal to or less than 0.5 dB). In the event that OTDR acceptance testing must be done on a unidirectional basis (for reasons described above), an average per span splice loss will be 0.30 dB. If the average bi-directional splice loss of each span exceeds 0.15 dB (or 0.30 dB uni-directionally), MFN will provide upon the Customer's request documentation of at a least three attempts to reduce this value to below 0.15 dB (0.30 dB uni-directionally). The only exception to this will be in the instance of a splice between two different fiber types (Standard Single-mode to Dispersion Shifted, Depressed-Clad to Matched Clad, fibers with different mode-field diameters). Customer should also note that the loss and/or reflectance of the front-end connector (as measured using a launch cord) is only an indicator of a problem such as a defective port, bulkhead, or the like. Since a different patch cord will be used by Customer (that connects to their equipment, for example) to mate to this connector, a different loss and/or reflectance may occur. EXHIBIT B LESSEE FIBER EXECUTION COPY CONFIDENTIAL EXHIBIT B INCOMPLETE SEGMENTS ----------------------------------------------------------------------------------------------------------------------------------- SELECTED SEGMENT (BRANCH A) ------------------------------------------------------- LENGTH OF NUMBER ESTIMATED TOTAL CITY FACILITY DELIVERY DATE RING/SEGMENT OF FIBERS MILES CHARGES ------------------ ------------------------------- -------------- ------------ --------- --------- ------- Manhattan Ring 3 2/4/2000 5.864 60 351.81 $ [***] Manhattan Ring 4 3/13/2000 3.995 60 239.67 $ [***] Manhattan Ring 5 1/28/2000 3.389 60 203.31 $ [***] Manhattan Ring 6-1 2/1/2000 12.761 48 612.54 $ [***] Manhattan Ring 6-2 9/16/2000 11.745 12 140.94 $ [***] Manhattan Ring 7 2/4/2000 8.025 6 48.15 $ [***] EXECUTION COPY CONFIDENTIAL EXHIBIT B INCOMPLETE SEGMENTS -------------------------------------------------------------------------------------------------------------------------- SELECTED SEGMENT (BRANCH A) ---------------------------------------------------- LENGTH OF NUMBER ESTIMATED TOTAL CITY FACILITY DELIVERY DATE RING/SEGMENT OF FIBERS MILES CHARGES ------------- --------------------------------- ------------- ------------ --------- --------- -------- Chicago DT Ring 4 8/15/2002 3.825 24 91.80 $ [***] * Notwithstanding any provision in the Fiber Lease, WCG may take less than 6 fibers on this route. ** Additional New York Segments - Unrestricted Fiber EXHIBIT C BUILDING ACCESS 1 MFN will terminate Lessee Fiber at MFN's termination point and splice and test to Williams-owned riser.

OTDR TESTING. This testing will be conducted at both 1310 nm and 1550 nm wavelengths when the Leased Fiber consists of Standard Single Mode Fiber, but will be done at 1550 nm only if the Leased Fiber consists of either Dispersion Shifted Fiber (True-WaveTM, LEAFTM, etc.) or a combination of Single Mode and Dispersion Shifted fiber types. OTDR testing will be conducted on a bi-directional basis for each Leased Fiber in each span at the appropriate wavelengths for the Leased Fiber described above. However, if due to length or attenuation reasons that the Leased Fiber span exceeds the dynamic range of an OTDR, a portion or the entire span may be tested on a unidirectional basis only. Alternatively, the Leased Fiber span may be divided into shorter testing spans, to the extent reasonably possible, in order to obtain bi-directional analysis. Also, in instances where a Customer intends to accept Leased Fiber that is not terminated at one end by MFN in a fiber distribution panel (such as in a manhole or handhole) only unidirectional testing will be performed. The turnover documentation package delivered to Customer will contain the actual traces that detail the testing parameters (including pulse width, averaging and range). The average bi-directional splice loss for all splices within each span will be of 0.15 dB or less while each connector pair (such as at a FDP) will have an average bi-directional loss of 0.5 dB or less. (Note that the front and end connector of the span can only be measured uni-directionally and will also have a loss equal to or less than 0.5 dB). In the event that OTDR acceptance testing must be done on a unidirectional basis (for reasons described above), an average per span splice loss will be 0.30 dB. If the average bi-directional splice loss of each span exceeds 0.15 dB (or 0.30 dB uni-directionally), MFN will provide upon the Customer's request documentation of at a least three attempts to reduce this value to below 0.15 dB (0.30 dB uni-directionally). The only exception to this will be in the instance of a splice between two different fiber types (Standard Single-mode to Dispersion Shifted, Depressed-Clad to Matched Clad, fibers with different mode-field diameters). Customer should also note that the loss and/or reflectance of the front-end connector (as measured using a launch cord) is only an indicator of a problem such as a defective port, bulkhead, or the like. Since a different patch cord will be used by Customer (that connects to their equipment, for example) to mate to this connector, a different loss and/or reflectance may occur. EXHIBIT B LESSEE FIBER EXECUTION COPY MFN DATA CENTERS LA1 2260 East El Segundo Boulevard El Segundo, CA 90245 ▇▇▇ 1807 Michael Faraday Court NY1 ▇▇▇▇▇▇, ▇▇ 20190 111 8th Avenue, #209 New York, NY 10011 ▇▇ ▇ 2051 Chain Bridge Road NY2 ▇▇▇▇▇▇, ▇▇ ▇▇▇▇▇ ▇▇▇ ▇▇▇ ▇▇▇▇▇▇ ▇▇▇ ▇▇▇▇▇ ▇▇▇ ▇▇▇▇, ▇▇ ▇▇▇▇▇ ▇▇▇▇ ▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇ ▇▇▇▇▇ ▇▇▇ ▇▇▇ ▇▇▇▇ ▇▇▇▇▇t San F▇▇▇▇▇▇▇▇, ▇▇ ▇▇▇▇▇ ▇▇▇ ▇▇ ▇. ▇▇▇ ▇▇▇▇▇▇do Str▇▇▇, ▇▇▇▇ ▇▇▇▇▇ ▇▇▇ ▇▇▇▇, ▇▇ ▇▇▇▇▇ ▇▇▇ 150 S▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇, #289 San Jose, CA 95113 SJ3 1735 Lundy Ave▇▇▇ ▇▇▇ ▇▇▇▇, ▇▇ ▇▇▇▇▇ ▇▇▇ ▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇▇rd, Su▇▇▇ ▇▇▇ ▇▇▇▇▇▇, VA 22182 ▇▇▇▇▇▇▇▇▇ ▇▇▇▇ CONFIDENTIAL EXHIBIT B INCOMPLETE SEGMENTS ----------------------------------------------------------------------------------------------------------------------------------- SELECTED SEGMENT C FORM OF AS-BUILTS 1. Alignment Sheets A. As-Built Alignment Sheets shall include the following information: o Cable Information: cable type, fiber type, reel number, cable composition o Right-of-Way: landowner/facility owner, border locations (BRANCH Aper municipality) ------------------------------------------------------- LENGTH OF NUMBER ESTIMATED TOTAL CITY FACILITY DELIVERY DATE RINGo Route Information: manhole/SEGMENT OF FIBERS MILES CHARGES ------------------ ------------------------------- -------------- ------------ --------- --------- ------- Manhattan Ring 3 2/4/2000 5.864 60 351.81 $ [***] Manhattan Ring 4 3/13/2000 3.995 60 239.67 $ [***] Manhattan Ring 5 1/28/2000 3.389 60 203.31 $ [***] Manhattan Ring 6handhole location and number, manhole/handhole size and ownership, splice locations, cable length markers at splice points and slack coils, splice enclosure type, attachment height (when applicable), pole number (when applicable), bore location (when applicable), bridge/tunnel attachment (when applicable), offset and depth (when applicable), location of utility crossings, location of reference points/permanent structures, transitional points, street names, conduit and innerduct position information/butterflies B. As-1 2/1/2000 12.761 48 612.54 $ [***] Manhattan Ring 6Built Alignment Sheets shall be updated with actual construction field data. C. The scale of As-2 9/16/2000 11.745 12 140.94 $ [***] Manhattan Ring 7 2/4/2000 8.025 6 48.15 $ [***] EXECUTION COPY CONFIDENTIAL EXHIBIT B INCOMPLETE SEGMENTS -------------------------------------------------------------------------------------------------------------------------- SELECTED SEGMENT Built Alignment Sheets shall not exceed 1" = 200' in metropolitan areas (BRANCH Aareas where there is either extensive development and improvement or rapid growth (new building construction)) ---------------------------------------------------- LENGTH OF NUMBER ESTIMATED TOTAL CITY FACILITY DELIVERY DATE RING/SEGMENT OF FIBERS MILES CHARGES ------------- --------------------------------- ------------- ------------ --------- --------- -------- Chicago DT Ring 4 8/15/2002 3.825 24 91.80 $ [***] * Notwithstanding any provision or 1" = 500' in the Fiber Lease, WCG may take less than 6 fibers on this route. ** Additional New York Segments - Unrestricted Fiber EXHIBIT C BUILDING ACCESS 1 MFN will terminate Lessee Fiber at MFN's termination point and splice and test to Williamsnon-owned risermetropolitan areas.

OTDR TESTING. All traces will be provided in hard copy and diskette form using GR 196 format. This testing will be conducted at both 1310 nm and 1550 nm wavelengths when the Leased Fiber consists of Standard Single Mode Fiber, but will be done at 1550 nm only if the Leased Fiber consists of either Dispersion Shifted Fiber (True-WaveTMWave(TM), LEAFTMLEAF(TM), etc.) or a combination of Single Mode and Dispersion Shifted fiber types. OTDR testing will be conducted on a bi-directional basis for each Leased Fiber in each span at the appropriate wavelengths for the Leased Fiber described above. However, if due to length or attenuation reasons that the Leased Fiber span exceeds the dynamic range of an OTDR, a portion or the entire span may be tested on a unidirectional basis only. Alternatively, the Leased Fiber span may be divided into shorter testing spans, to the extent reasonably possible, in order to obtain bi-directional analysis. Also, in instances where a Customer intends to accept Leased Fiber that is not terminated at one end by MFN in a fiber distribution panel (such as in a manhole or handhole) only unidirectional testing will be performed. The turnover documentation package delivered to Customer will contain the actual traces that detail the testing parameters (including pulse width, averaging and range). The average bi-directional splice loss for all splices within each span will be of 0.15 dB or less while each connector pair (such as at a FDP) will have an average bi-directional connector loss for all splices within each span of 0.5 dB or lessless for all connectors within each span. (Note that the front and end connector of the span can only be measured uni-directionally and will also have a loss equal to or less than 0.5 dB). In the event that OTDR acceptance testing must be done on a unidirectional basis (for reasons described above), an average per span splice loss will be 0.30 dB. All traces will be provided in hard copy and/or diskette form using GR 196 format. If the average bi-directional splice loss of each span exceeds 0.15 dB (or 0.30 dB uni-directionally), MFN will provide upon the Customer's request documentation of at a least three attempts to reduce this value to below 0.15 dB dB (0.30 dB uni-directionally). The only exception to this will be in the instance of a splice between two different fiber types (Standard Single-mode to Dispersion Shifted, Depressed-Clad to Matched Clad, fibers with different mode-field diameters). Customer should also note that the loss and/or reflectance of the front-end connector (as measured using a launch cord) is only an indicator of a problem such as a defective port, bulkhead, or the like. Since a different patch cord will be used by Customer (that connects to their equipment), for example) to mate make to this connector, a different loss and/or the reflectance may occur. EXHIBIT B LESSEE FIBER EXECUTION COPY CONFIDENTIAL o New York City o Northern New Jersey o Philadelphia o Chicago o Dallas o Washington, DC EXHIBIT B INCOMPLETE SEGMENTS ----------------------------------------------------------------------------------------------------------------------------------- SELECTED SEGMENT (BRANCH A) ------------------------------------------------------- LENGTH OF NUMBER ESTIMATED TOTAL CITY FACILITY DELIVERY DATE RING/SEGMENT OF FIBERS MILES CHARGES ------------------ ------------------------------- -------------- ------------ --------- --------- ------- Manhattan Ring 3 2/4/2000 5.864 60 351.81 $ C [**] [*] Manhattan Ring 4 3/13/2000 3.995 60 239.67 $ Indicates confidential treatment requested. EXHIBIT D MFN'S COMMERCIAL BUILDING ACCESS CRITERIA 1. The building qualifies as a Class A commercial building. 2. The building is located within [**] mile of the Network. 3. The building has at least [*] Manhattan Ring 5 1/28/2000 3.389 60 203.31 $ square feet. 4. The building has a lest [**] tenants. 5. MFN obtains the following access rights for a minimum term of [*] Manhattan Ring years after either (1) directly from the building owner or manager via a Telecommunications License Agreement or (ii) through an existing Carrier's arrangement with the building owner or manager (without MFN being subject to any additional rent or exclusive dealing provisions): a. May bring up to four hundred thirty two (432) fiber strands through two (2) diverse locations and into MFN-installed distribution panels or racks, b. cross-connect and provide dark fiber services to MFN carrier clients and tenants, with right, subject to availability, to fiber home run to MFN private network customers, c. install three-inch (3") conduits from up to two (2) diverse points-of-entry to Carrier or MFN's space, and from Carrier or MFN's space to riser access points. d. Except for its pre-existing private network clients (for which there shall be no by-pass fees), MFN will use Carrier's managed or other building central distribution system (including, without limitation, all internal conduit, risers, space and other building facilities) ("CDS") under "most favored nation" terms and conditions and without a requirement for by-pass fees, e. MFN retains all right, title and interest in and to the optical fiber strands, equipment and interfaces (including, without limitation, riser conduits) which MFN installs, f. MFN's rights set forth above will survive the expiration or termination of any agreement between MFN and Carrier or any agreement between Carrier and the Building owner or manager, at no cost or additional rent to MFN, and g. if the Carrier's arrangement is terminated, then the Building owner or manager will provide such rights to MFN for a total term of ten (10) years with two (2) five (5) year renewal options for a charge determined by the Building owner or manager but in accordance with the applicable fair market value and agreed upon by MFN, provided MFN is not in default. 6-1 2/1/2000 12.761 48 612.54 $ . MFN reserves the right to revise the foregoing criteria from time to time in its sole discretion. [***] Manhattan Ring 6-2 9/16/2000 11.745 12 140.94 $ [***] Manhattan Ring 7 2/4/2000 8.025 6 48.15 $ [***] EXECUTION COPY CONFIDENTIAL Indicates confidential treatment requested. EXHIBIT B INCOMPLETE SEGMENTS -------------------------------------------------------------------------------------------------------------------------- SELECTED SEGMENT E METROMEDIA FIBER NETWORK SERVICES, INC. TELECOMMUNICATIONS LICENSE AGREEMENT THIS TELECOMMUNICATIONS LICENSE AGREEMENT (BRANCH A"Agreement) ---------------------------------------------------- LENGTH OF NUMBER ESTIMATED TOTAL CITY FACILITY DELIVERY DATE RING/SEGMENT OF FIBERS MILES CHARGES ------------- --------------------------------- ------------- ------------ --------- --------- -------- Chicago DT Ring 4 8/15/2002 3.825 24 91.80 $ [***] * Notwithstanding any provision is made as of this __ day of __________ 2000 between("Licensor"), having an address of ____________________ and METROMEDIA FIBER NETWORK SERVICES, INC., its permitted successors and/or assigns, having an address of ▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇▇▇▇ ▇▇▇▇▇▇, ▇▇▇▇▇ ▇▇▇▇▇▇, ▇▇▇ ▇▇▇▇ ▇▇▇▇▇ ("Licensee"). RECITAL A. Licensor is the owner of certain lands as more particularly described on Exhibit (the "Land") and a building on the Land (the "Building") commonly known as B. Licensor desires to give the Building access to telecommunications services without restricting Licensor's or its tenants' choice of service providers, C. Licensee desires to connect the Building to its fiber optic network (the "Network") and to install certain telecommunications facilities on or in the Fiber Lease, WCG land and inside the Building so that the Licensor's tenants may take less than 6 fibers on this route. ** Additional New York Segments - Unrestricted Fiber EXHIBIT C BUILDING ACCESS 1 MFN will terminate Lessee Fiber at MFNobtain telecommunications services over Licensee's termination point and splice and test to Williams-owned risernetwork.