Common use of Attenuation Clause in Contracts

Attenuation. UNCABLED FIBER ATTENUATION CELLS ------------------------------------------ Attenuation Cells (dB/km) ------------------------------------------ Wavelength (nm) Standard ------------------------------------------ 1310 less than or = to 0.40 ------------------------------------------ 1550 less than or = to 0.30 ------------------------------------------ *Lower attenuation available in limited quantities. POINT DISCONTINUITY. No point of discontinuity greater than 0.10 dB at either 1310 nm or 1550 nm. ATTENUATION AT THE WATER PEAK The attenuation at 1383+ 3 nm shall not exceed 2.1 dB/km. - ---------------------------------------------------- ATTENUATION VS. WAVELENGTH ---------------------------------------------------- Range Ref. # Max Increase (nm) (nm) a (dB/km) ---------------------------------------------------- 1285-1330 1310 Standard ---------------------------------------------------- 1525-1575 1550 less than or = to 0.40 ---------------------------------------------------- The attenuation in a given wavelength range does not exceed the attenuation of the reference wavelenght (#) by more than the value a. ---------------------------------------------------------------------- ATTENUATION WITH BENDING ---------------------------------------------------------------------- Mandrel Number of Wavelength Induced Diameter Turns (nm) Attenuation (mm) (dB) ---------------------------------------------------------------------- 32 1 1550 less than or = to 0.50 ---------------------------------------------------------------------- 75 100 1810 less than or = to 0.05 ---------------------------------------------------------------------- 75 100 1550 less than or = to 0.10 ---------------------------------------------------------------------- The induced attenuation due to fiber wrapped around a mandrel of a specified diameter. o CABLE CUTOFF WAVELENGTH (#ccf) o MODE FIELD DIAMETER #ccf less than 1260 nm 9.30 + 0.50 m at 1310 nm - 10.50 + 1.00 m at 1550 nm - o DISPERSION Zero Dispersion Wavelength (#-): 1301.5 nm less than #- less than or = to 1321.5 nm Zero Dispersion Slope (S\o\): less than or = to 0.092 ps/(nm to the second power . km) Fiber Polarization Mode Dispersion Coefficient (PMD): less than or = to 0.5 psec/ km -------------------------------------------------------------------------------- DISPERSION CALCULATION -------------------------------------------------------------------------------- S\o\ Dispersion=D(#):S\o\[# - # _ to the fourth power]ps/(nm . km), for 1200 nm ---- ------------------------ 4 # to the third power less than or = to # less than or = to 1600 nm # = Operating Wavelength Contract No. 97TX-10072 ENVIRONMENTAL SPECIFICATIONS -------------------------------------------------------------------------------- ENVIRONMENTAL TEST INDUCED Operating CONDITION ATTENUATION Temperature Range (dB/km) -60 degree C + 85 degree C -------------------------------------------------------------------------------- 1310 nm 1550 nm -------------------------------------------------------------------------------- Temperature Dependence less than or = to 0.05 less than or = to 0.05 -60 degree C to 85 degree C -------------------------------------------------------------------------------- Temperature-Humidity less than or = to 0.05 less than or = to 0.05 Cycling -10 degree C to + 85 degree C, up 98% RH -------------------------------------------------------------------------------- Water Immersion, 23 degree C less than or = to 0.05 less than or = to 0.05 -------------------------------------------------------------------------------- Heat Aging, 85 degree C less than or = to 0.05 less than or = to 0.05 -------------------------------------------------------------------------------- DIMENSIONAL SPECIFICATIONS STANDARD LENGTH (km/reel): 2.2 - 25.0 *Longer spliced lengths available at a premium.

Attenuation. UNCABLED FIBER ATTENUATION CELLS ------------------------------------------ Uncabled Fiber Attenuation Cells (dB/km) ------------------------------------------ Wavelength (nm) Standard ------------------------------------------ 1310 less than or = to 0.40 ------------------------------------------ 1550 less than or = to 0.30 ------------------------------------------ *Lower attenuation available in limited quantities. POINT DISCONTINUITY. Point Discontinuity ------------------------------------------------ ------------------------- ---------------------- Attenuation Cells No point of discontinuity greater than 0.10 dB at either 1310 nm (dB/km) or 1550 nm. ATTENUATION AT THE WATER PEAK ------------------------- ---------------------- ------------------------- ---------------------- Wavelength (nm) Standard ------------------------- ---------------------- ------------------------- ---------------------- Less than or equal to 1310 0.40 Attenuation at the Water Peak ------------------------- ---------------------- ------------------------- ---------------------- Less than or equal to 1550 0.30 The attenuation at 1383+ 1383 plus or minus 3 nm shall not exceed 2.1 dB/km. - ---------------------------------------------------- ATTENUATION VS. WAVELENGTH ---------------------------------------------------- ------------------------- ---------------------- -------------------------------------------------------------- Attenuation vs. Wavelength -------------------------------------------------------------- --------------------- ------------------- -------------------- Range Ref. # lambda Max Increase (nm) (nm) a (dB/km) ---------------------------------------------------- 1285-1330 1310 Standard ---------------------------------------------------- 1525-1575 1550 less than or = to 0.40 ---------------------------------------------------- The attenuation in a given wavelength range does (nm) (nm) alpha (dB/km) not exceed the attenuation of the reference wavelenght wavelength (#lambda) by more than the value a. ---------------------------------------------------------------------- ATTENUATION WITH BENDING ---------------------------------------------------------------------- alpha. --------------------- ------------------- -------------------- --------------------- ------------------- -------------------- 1285-1330 1310 0.1 --------------------- ------------------- -------------------- --------------------- ------------------- -------------------- 1525-1575 1550 0.05 --------------------- ------------------- -------------------- ----------------------------------------------------------------------------- Attenuation With Bending ----------------------------------------------------------------------------- -------------------- ----------------- ----------------- -------------------- Mandrel Number of Wavelength Induced The induced attenuation due to Diameter Turns (nm) Attenuation (mm) (dB) ---------------------------------------------------------------------- 32 1 1550 less than or = to 0.50 ---------------------------------------------------------------------- 75 100 1810 less than or = to 0.05 ---------------------------------------------------------------------- 75 100 1550 less than or = to 0.10 ---------------------------------------------------------------------- The induced attenuation due to fiber wrapped around a mandrel (nm) (dB) of a specified diameter. -------------------- ----------------- ----------------- -------------------- -------------------- ----------------- ----------------- -------------------- Less than or equal to 32 1 1550 0.50 -------------------- ----------------- ----------------- -------------------- -------------------- ----------------- ----------------- -------------------- Less than or equal to 75 100 1310 0.05 -------------------- ----------------- ----------------- -------------------- -------------------- ----------------- ----------------- -------------------- Less than or equal to 75 100 1550 0.10 -------------------- ----------------- ----------------- -------------------- o CABLE CUTOFF WAVELENGTH Cable Cutoff Wavelength (#lambda ccf) o MODE FIELD DIAMETER #ccf Mode-Field Diameter (lambda ccf) less than 1260 nm 9.30 + plus or minus 0.50 mu m at 1310 nm - 10.50 + plus or minus 1.00 mu m at 1550 nm - o DISPERSION Dispersion Zero Dispersion Wavelength (#-lambda o): 1301.5 1300 nm less than #- less Less than or = equal to 1321.5 (lambda o) Less than or equal to 1322 nm Zero Dispersion Slope (S\o\So): less Less than or = equal to 0.092 ps/(nm to the second power . squared times km) Fiber Polarization Mode Dispersion Coefficient (PMD): less Less than or = equal to 0.5 psec/ psec divided by square root km -------------------------------------------------------------------------------- DISPERSION CALCULATION -------------------------------------------------------------------------------- S\o\ Dispersion=D(#):S\o\[# - # _ to the fourth power]ps/(nm C2 -------------------------------------------------------------------------------------------------------------------- Dispersion Calculation -------------------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------------------- The agreement sets forth a detailed calculation of dispersion. km), for 1200 nm ---- ------------------------ 4 # to the third power less than or = to # less than or = to 1600 nm # = Operating Wavelength Contract No. 97TX-10072 -------------------------------------------------------------------------------------------------------------------- ENVIRONMENTAL SPECIFICATIONS -------------------------------------------------------------------------------- ENVIRONMENTAL TEST INDUCED ------------------------------------------ -------------------------------- Environmental Test Induced Operating CONDITION ATTENUATION Temperature Range Condition Attenuation -60(degree)C to +85(degree)C (dB/km) -60 degree C + 85 degree C -------------------------------------------------------------------------------- ------------------------------------------ -------------------------------- ------------------------------------------ -------------- ----------------- 1310 nm 1550 nm -------------------------------------------------------------------------------- ------------------------------------------ -------------- ----------------- ------------------------------------------ -------------- ----------------- Less than or Less than or equal to equal to Temperature Dependence less 0.05 0.05 -60(degree)to +85(degree)C ------------------------------------------ -------------- ----------------- ------------------------------------------ -------------- ----------------- Less than or = to 0.05 less Less than or = equal to 0.05 -60 degree C equal to 85 degree C -------------------------------------------------------------------------------- Temperature-Humidity less than or = Cycling 0.05 0.05 -10(degree)C to 0.05 less than or = to 0.05 Cycling -10 degree C to + 85 degree C+85(degree)C, up to 98% RH -------------------------------------------------------------------------------- ------------------------------------------ -------------- ----------------- ------------------------------------------ -------------- ----------------- Less than or Less than or equal to equal to Water Immersion, 23 degree C less 23(degree)C 0.05 0.05 ------------------------------------------ -------------- ----------------- ------------------------------------------ -------------- ----------------- Less than or = to 0.05 less Less than or = equal to 0.05 -------------------------------------------------------------------------------- equal to Heat Aging, 85 degree C less than or = to 85(degree)C 0.05 less than or = to 0.05 -------------------------------------------------------------------------------- ------------------------------------------ -------------- ----------------- DIMENSIONAL SPECIFICATIONS STANDARD LENGTH Standard Length (km/reel): 2.2 - 25.0 *Longer spliced lengths available at a premium.25.0

Attenuation. UNCABLED FIBER ATTENUATION CELLS ------------------------------------------ Point Discontinuity Uncabled Fiber Attenuation Cells (dB/km) ------------------------------------------ Wavelength (nm) Standard ------------------------------------------ 1310 less than or = to 0.40 ------------------------------------------ 1550 less than or = to 0.30 ------------------------------------------ *Lower attenuation available in limited quantities. POINT DISCONTINUITY. ----------------------- ---------------------------- Attenuation Cells No point of discontinuity greater than 0.10 dB at either 1310 nm (dB/km) or 1550 nm. ATTENUATION AT THE WATER PEAK ----------------------- ---------------------------- Wavelength (nm) Standard ----------------------- ---------------------------- 1310 <= 0.40 Attenuation at the Water Peak ----------------------- ---------------------------- 1550 <= 0.30 The attenuation at 1383+ 1383 +/- 3 nm shall not exceed 2.1 dB/km. - ---------------------------------------------------- ATTENUATION VS. WAVELENGTH ---------------------------------------------------- ----------------------- ---------------------------- Attenuation vs. Wavelength ------------------- ------------------- ------------------ Range Ref. # (lambda) Max Increase (nm) (nm) a (dB/km) ---------------------------------------------------- 1285-1330 1310 Standard ---------------------------------------------------- 1525-1575 1550 less than or = to 0.40 ---------------------------------------------------- <- The attenuation in a given wavelength range does not (nm) (nm) (alpha) (dB/km) exceed the attenuation of the reference wavelenght ------------------- ------------------- ------------------ 1285-1330 1310 0.05 wavelength (#(lambda)) by more than the value a. ---------------------------------------------------------------------- ATTENUATION WITH BENDING ---------------------------------------------------------------------- (alpha). ------------------- ------------------- ------------------ 1525-1575 1550 0.05 ------------------- ------------------- ------------------ Attenuation With Bending ---------------- -------------- --------------- ------------------ Mandrel Number of Wavelength Induced Diameter Turns (nm) Attenuation (mm) (dB) ---------------------------------------------------------------------- 32 1 1550 less than or = to 0.50 ---------------------------------------------------------------------- 75 100 1810 less than or = to 0.05 ---------------------------------------------------------------------- 75 100 1550 less than or = to 0.10 ---------------------------------------------------------------------- <- The induced attenuation due to fiber wrapped Diameter Turns (nm) Attenuation around a mandrel of a specified (mm) (dB) diameter. o CABLE CUTOFF WAVELENGTH ---------------- -------------- --------------- ------------------ 32 1 1550 <= 0.50 ---------------- -------------- --------------- ------------------ 75 100 1310 <= 0.05 ---------------- -------------- --------------- ------------------ 75 100 1550 <= 0.10 ---------------- -------------- --------------- ------------------ * Cable Cutoff Wavelength (#ccf(lambda)ccf) o MODE FIELD DIAMETER #ccf less than * Mode-Field Diameter (lambda)ccf < 1260 nm 9.30 + +/- 0.50 m (mu)m at 1310 nm - 10.50 + +/- 1.00 m (mu)m at 1550 nm - o DISPERSION * Dispersion Zero Dispersion Wavelength (#-(lambda)o): 1301.5 nm less than #- less than or <= to (lambda)o <= 1321.5 nm Zero Dispersion Slope (S\o\So): less than or <= to 0.092 ps/(nm to the second power . ps/(nm2 x km) Fiber Polarization Mode Dispersion Coefficient (PMD): less than or <= to 0.5 psec/ psec/square root km -------------------------------------------------------------------------------- DISPERSION CALCULATION -------------------------------------------------------------------------------- S\o\ -2 of 8- Dispersion Calculation ---------------------------------------------------------------------------------------------------------------------- Dispersion=D(#):S\o\D(lambda):approximately So/4 [# - # _ (lambda)-(lambda)o to the fourth power]ps/(nm . 4th power/(lambda) to the 3rd power]ps/ (nm x km), for 1200 nm ---- ------------------------ 4 # to the third power less than or = to # less than or = to 1600 <=(lambda)<=1600 nm # = Operating (lambda)=Operating Wavelength Contract No. 97TX-10072 ---------------------------------------------------------------------------------------------------------------------- ENVIRONMENTAL SPECIFICATIONS -------------------------------------------------------------------------------- ENVIRONMENTAL TEST INDUCED Induced Attenuation Operating CONDITION ATTENUATION Temperature Range Environmental Test Condition (dB/km) -60 degree C + 85 degree C -------------------------------------------------------------------------------- -60(Degree)C to +85(Degree)C ----------------------------------------- ------------------------------ 1310 nm 1550 nm -------------------------------------------------------------------------------- ----------------------------------------- ------------- ---------------- Temperature Dependence less than or <= 0.05 <= 0.05 -60(Degree) to 0.05 less than or = to 0.05 -60 degree C to 85 degree C -------------------------------------------------------------------------------- +85(Degree)C ----------------------------------------- ------------- ---------------- Temperature-Humidity less than or Cycling <= 0.05 <= 0.05 -10(Degree)C to 0.05 less than or = to 0.05 Cycling -10 degree C to + 85 degree C+85(Degree)C, up to 98% RH -------------------------------------------------------------------------------- ----------------------------------------- ------------- ---------------- Water Immersion, 23 degree C less than or 23(Degree)C <= to 0.05 less than or <= to 0.05 -------------------------------------------------------------------------------- ----------------------------------------- ------------- ---------------- Heat Aging, 85 degree C less than or 85(Degree)C <= to 0.05 less than or <= to 0.05 -------------------------------------------------------------------------------- ----------------------------------------- ------------- ---------------- DIMENSIONAL SPECIFICATIONS STANDARD LENGTH Standard Length (km/reel): 2.2 - 25.0 *Longer spliced lengths available at a premium.Glass Geometry Coating Geometry Fiber Curl: => 2.0 m radius of curvature Coating Diameter: 245 +/- 10 (mu)m Cladding Diameter: 125.0 +/- 1.0 (mu)m Coating-Cladding Concentricity: < 12 (mu)m Core-Clad Concentricity: <= 0.8 (mu)m Cladding Non-Circularity: < 1.0% Defined as: [1-(Min. Cladding Diameter/Max. Cladding Diameter)] x 100 -3 of 8- MECHANICAL SPECIFICATIONS

Attenuation. UNCABLED FIBER ATTENUATION CELLS ------------------------------------------ POINT DISCONTINUITY ----------------------------------- Attenuation Cells (dB/km) ------------------------------------------ Wavelength (nm) Standard ------------------------------------------ 1310 less than or = to 0.40 ------------------------------------------ 1550 less than or = to 0.30 ------------------------------------------ *Lower attenuation available in limited quantities. POINT DISCONTINUITY. No point of discontinuity greater than (dB/km) 0.10 dB at either 1310 nm or 1550 nm. ----------------------------------- Wavelength (nm) Standard ----------------------------------- 1310 Less than or ATTENUATION AT THE WATER PEAK equal to 0.40 ----------------------------------- 1550 Less than or The attenuation at 13831383 + 3 nm shall not equal to 0.30 exceed 2.1 dB/km. - ---------------------------------------------------- ----------------------------------- ---------------------------------- ATTENUATION VS. WAVELENGTH ---------------------------------------------------- ---------------------------------- Range Ref. # .L Max Increase The attenuation in a given wavelength (nm) (nm) a (dBA(dB/km) ---------------------------------------------------- 1285-1330 1310 Standard ---------------------------------------------------- 1525-1575 1550 less than or = to 0.40 ---------------------------------------------------- The attenuation in a given wavelength range does not exceed the attenuation of ---------------------------------- the reference wavelenght wavelength (#L) by more 1285-1330 1310 0.05 than the value a. ---------------------------------------------------------------------- A. ---------------------------------- 1525-1575 1550 0.05 -------------------------------------------------------------------------------- -------------------------------------------------- ATTENUATION WITH BENDING ---------------------------------------------------------------------- -------------------------------------------------- Mandrel Number of Wavelength Induced The induced attenuation due Diameter Turns (nm) Attenuation (mm) (dB) ---------------------------------------------------------------------- 32 1 1550 less than or = to 0.50 ---------------------------------------------------------------------- 75 100 1810 less than or = to 0.05 ---------------------------------------------------------------------- 75 100 1550 less than or = to 0.10 ---------------------------------------------------------------------- The induced attenuation due to fiber wrapped around a (nm) (dB) mandrel of a specified -------------------------------------------------- 32 1 1550 Less than or diameter. o equal to 0.50 -------------------------------------------------- 75 100 1310 Less than or equal to 0.05 -------------------------------------------------- 75 100 1550 Less than or equal to 0.10 -------------------------------------------------------------------------------- . CABLE CUTOFF WAVELENGTH (#ccfL\ccf\) o MODE . MODE-FIELD DIAMETER #ccf less (L\ccf\) Less than 1260 nm micro m 9.30 + 0.50 micro m at 1310 nm - 10.50 + 1.00 micro m at 1550 nm - o . DISPERSION Exhibit C, Page 3 of 4 Contract No. 98TX-10143 Electric Lightwave, Inc. Effective on the Effective Date Zero Dispersion Wavelength (#-Lo): 1301.5 nm less than #- or equal to (Lo) less than or = equal to 1321.5 nm Zero Dispersion Slope (S\o\So): less than or = equal to 0.092 ps/(nm to the second power ps/(nm/2/ . km) Fiber Polarization Mode Dispersion Coefficient (PMD): less than or = equal to 0.5 psec/ psec divided by km -------------------------------------------------------------------------------- --------------------------------------------------------------------------------------------------- DISPERSION CALCULATION -------------------------------------------------------------------------------- S\o\ Dispersion=D(#):S\o\--------------------------------------------------------------------------------------------------- Dispersion = D (L): approximately So [# L - # _ to the fourth power]ps/(nm . kmLo4] ps/ (xx.xx), for 1200 nm ---- ------------------------ 4 # to the third power less than or = equal to # L -- --- less than 4 [ L3] or = equal to 1600 nm # L = Operating Wavelength Contract No. 97TX-10072 1600 nm ---------------------------------------------------------------------------------------------------- ENVIRONMENTAL SPECIFICATIONS -------------------------------------------------------------------------------- --------------------------------------------------------------------- ENVIRONMENTAL TEST INDUCED Operating Temperature Range CONDITION ATTENUATION Temperature Range -60C to +85C (dBDB/kmKM) -60 degree C + 85 degree C -------------------------------------------------------------------------------- --------------------------------------------------------------------- 1310 nm 1550 nm -------------------------------------------------------------------------------- --------------------------------------------------------------------- Temperature Dependence less Less than or = Less than or -60 degrees to +85 degrees C equal to 0.05 less than or = equal to 0.05 -60 degree C to 85 degree C -------------------------------------------------------------------------------- --------------------------------------------------------------------- Temperature-Humidity less Cycling Less than or = to 0.05 less Less than or = -10C to 0.05 Cycling -10 degree C to + 85 degree C+85C, up to 98% RH -------------------------------------------------------------------------------- equal to 0.05 equal to 0.05 --------------------------------------------------------------------- Water Immersion, 23 degree C less 23C Less than or = Less than or equal to 0.05 less than or = equal to 0.05 -------------------------------------------------------------------------------- --------------------------------------------------------------------- Heat Aging, 85 degree C less 85C Less than or = Less than or equal to 0.05 less than or = equal to 0.05 -------------------------------------------------------------------------------- --------------------------------------------------------------------- DIMENSIONAL SPECIFICATIONS STANDARD LENGTH (kmKM/reelREEL): 2.2 - 25.0 *Longer spliced lengths available at a premium.Exhibit C, Page 4 of 4 Contract No. 98TX-10143 Electric Lightwave, Inc. Effective on the Effective Date GLASS GEOMETRY COATING GEOMETRY Fiber Curl: greater than or equal 2.0 m Coating Diameter: 245 + 10 micro m radius of curvature - Cladding Diameter: 125.0 + 1.0 micro m Coating-Cladding Concentricity: - less than 12 micro m Core-Clad Concentricity: less than or equal to 0.8 micro m Cladding Non-Circularity: less than 1.0% [ Min. Cladding Diameter ] Defined as: [1 - ---------------------- ] x 100 [ Max. Cladding Diameter ] MECHANICAL SPECIFICATIONS