Common use of Attenuation Clause in Contracts

Attenuation. Uncabled Fiber Attenuation Cells Point Discontinuity ------------------------------------------------ ------------------------- ---------------------- Attenuation Cells No point of discontinuity greater than 0.10 dB at either 1310 nm (dB/km) or 1550 nm. ------------------------- ---------------------- ------------------------- ---------------------- 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 plus or minus 3 nm shall not exceed 2.1 dB/km. ------------------------- ---------------------- -------------------------------------------------------------- Attenuation vs. Wavelength -------------------------------------------------------------- --------------------- ------------------- -------------------- Range Ref. lambda Max Increase The attenuation in a given wavelength range does (nm) (nm) alpha (dB/km) not exceed the attenuation of the reference wavelength (lambda) by more than the value 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 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 (lambda ccf) o 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 Zero Dispersion Wavelength (lambda o): 1300 nm Less than or equal to (lambda o) Less than or equal to 1322 nm Zero Dispersion Slope (So): Less than or equal to 0.092 ps/(nm squared times km) Fiber Polarization Mode Dispersion Coefficient (PMD): Less than or equal to 0.5 psec divided by square root km C2 -------------------------------------------------------------------------------------------------------------------- Dispersion Calculation -------------------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------------------- The agreement sets forth a detailed calculation of dispersion. -------------------------------------------------------------------------------------------------------------------- ENVIRONMENTAL SPECIFICATIONS ------------------------------------------ -------------------------------- Environmental Test Induced Operating Temperature Range Condition Attenuation -60(degree)C to +85(degree)C (dB/km) ------------------------------------------ -------------------------------- ------------------------------------------ -------------- ----------------- 1310 nm 1550 nm ------------------------------------------ -------------- ----------------- ------------------------------------------ -------------- ----------------- Less than or Less than or equal to equal to Temperature Dependence 0.05 0.05 -60(degree)to +85(degree)C ------------------------------------------ -------------- ----------------- ------------------------------------------ -------------- ----------------- Less than or Less than or equal to equal to Temperature-Humidity Cycling 0.05 0.05 -10(degree)C to +85(degree)C, up to 98% RH ------------------------------------------ -------------- ----------------- ------------------------------------------ -------------- ----------------- Less than or Less than or equal to equal to Water Immersion, 23(degree)C 0.05 0.05 ------------------------------------------ -------------- ----------------- ------------------------------------------ -------------- ----------------- Less than or Less than or equal to equal to Heat Aging, 85(degree)C 0.05 0.05 ------------------------------------------ -------------- ----------------- DIMENSIONAL SPECIFICATIONS Standard Length (km/reel): 2.2 - 25.0

Attenuation. Uncabled Fiber UNCABLED FIBER ATTENUATION CELLS ------------------------------------------ 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 0.10 dB at either 1310 nm (dB/km) or 1550 nm. ------------------------- ---------------------- ------------------------- ---------------------- Wavelength (nm) Standard ------------------------- ---------------------- ------------------------- ---------------------- Less than or equal to 1310 0.40 Attenuation at the Water Peak ------------------------- ---------------------- ------------------------- ---------------------- Less than or equal to 1550 0.30 ATTENUATION AT THE WATER PEAK The attenuation at 1383 plus or minus 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 (nm) (nm) alpha (dB/km) not exceed the attenuation of the reference wavelength wavelenght (lambda#) by more than the value alpha. --------------------- ------------------- -------------------- --------------------- ------------------- -------------------- 1285-1330 1310 0.1 --------------------- ------------------- -------------------- --------------------- ------------------- -------------------- 1525-1575 1550 0.05 --------------------- ------------------- -------------------- ----------------------------------------------------------------------------- Attenuation With Bending ----------------------------------------------------------------------------- -------------------- ----------------- ----------------- -------------------- a. ---------------------------------------------------------------------- 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 (lambda ccf) MODE FIELD DIAMETER #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#-): 1300 1301.5 nm Less less than #- less than or equal = to (lambda o) Less than or equal to 1322 1321.5 nm Zero Dispersion Slope (SoS\o\): Less less than or equal = to 0.092 ps/(nm squared times to the second power . km) Fiber Polarization Mode Dispersion Coefficient (PMD): Less less than or equal = to 0.5 psec divided by square root psec/ km C2 -------------------------------------------------------------------------------------------------------------------- Dispersion Calculation -------------------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------------------- The agreement sets forth a detailed calculation of dispersion-------------------------------------------------------------------------------- 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 -------------------------------------------------------------------------------- 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 -------------------------------------------------------------------------------- Temperature Dependence less than or Less = to 0.05 less than or equal = to equal 0.05 -60 degree C to Temperature Dependence 0.05 0.05 -60(degree)to +85(degree)C ------------------------------------------ -------------- ----------------- ------------------------------------------ -------------- ----------------- Less than or Less than or equal to equal to 85 degree C -------------------------------------------------------------------------------- Temperature-Humidity less than or = to 0.05 less than or = to 0.05 Cycling 0.05 0.05 -10(degree)C -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 0.05 0.05 ------------------------------------------ -------------- ----------------- ------------------------------------------ -------------- ----------------- Less 23 degree C less than or Less = to 0.05 less than or equal = to equal to 0.05 -------------------------------------------------------------------------------- Heat Aging, 85(degree)C 85 degree C less than or = to 0.05 less than or = to 0.05 ------------------------------------------ -------------- ----------------- -------------------------------------------------------------------------------- DIMENSIONAL SPECIFICATIONS Standard Length STANDARD LENGTH (km/reel): 2.2 - 25.025.0 *Longer spliced lengths available at a premium.

Attenuation. Uncabled Fiber Attenuation Cells Point Discontinuity ------------------------------------------------ ------------------------- ---------------------- UNCABLED FIBER ATTENUATION CELLS POINT DISCONTINUITY ----------------------------------- Attenuation Cells No point of discontinuity greater than (dB/km) 0.10 dB at either 1310 nm (dB/km) or 1550 nm. ------------------------- ---------------------- ------------------------- ---------------------- ----------------------------------- Wavelength (nm) Standard ------------------------- ---------------------- ------------------------- ---------------------- ----------------------------------- 1310 Less than or ATTENUATION AT THE WATER PEAK equal to 1310 0.40 Attenuation at the Water Peak ------------------------- ---------------------- ------------------------- ---------------------- ----------------------------------- 1550 Less than or equal to 1550 0.30 The attenuation at 1383 plus or minus + 3 nm shall not equal to 0.30 exceed 2.1 dB/km. ------------------------- ---------------------- -------------------------------------------------------------- Attenuation vs. Wavelength -------------------------------------------------------------- --------------------- ------------------- -------------------- - ----------------------------------- ---------------------------------- ATTENUATION VS. WAVELENGTH ---------------------------------- Range Ref. lambda .L Max Increase The attenuation in a given wavelength range does (nm) (nm) alpha (dBA(dB/km) range does not exceed the attenuation of ---------------------------------- the reference wavelength (lambdaL) by more than the value alpha. --------------------- ------------------- -------------------- --------------------- ------------------- -------------------- 1285-1330 1310 0.1 --------------------- ------------------- -------------------- --------------------- ------------------- -------------------- 0.05 than the value A. ---------------------------------- 1525-1575 1550 0.05 --------------------- ------------------- -------------------- ----------------------------------------------------------------------------- Attenuation With Bending ----------------------------------------------------------------------------- -------------------- ----------------- ----------------- -------------------- -------------------------------------------------------------------------------- -------------------------------------------------- ATTENUATION WITH BENDING -------------------------------------------------- Mandrel Number of Wavelength Induced The induced attenuation due to Diameter Turns (nm) Attenuation to fiber wrapped around a mandrel (nm) (dB) mandrel of a specified -------------------------------------------------- 32 1 1550 Less than or diameter. -------------------- ----------------- ----------------- -------------------- -------------------- ----------------- ----------------- -------------------- equal to 0.50 -------------------------------------------------- 75 100 1310 Less than or equal to 32 1 0.05 -------------------------------------------------- 75 100 1550 0.50 -------------------- ----------------- ----------------- -------------------- -------------------- ----------------- ----------------- -------------------- Less than or equal to 75 100 1310 0.05 -------------------- ----------------- ----------------- -------------------- -------------------- ----------------- ----------------- -------------------- 0.10 -------------------------------------------------------------------------------- . CABLE CUTOFF WAVELENGTH (L\ccf\) . MODE-FIELD DIAMETER (L\ccf\) Less than or equal to 75 100 1550 0.10 -------------------- ----------------- ----------------- -------------------- o Cable Cutoff Wavelength (lambda ccf) o Mode-Field Diameter (lambda ccf) less than 1260 nm micro m 9.30 plus or minus + 0.50 mu micro m at 1310 nm 10.50 plus or minus + 1.00 mu micro m at 1550 nm o Dispersion . DISPERSION Exhibit C, Page 3 of 4 Contract No. 98TX-10143 Electric Lightwave, Inc. Effective on the Effective Date Zero Dispersion Wavelength (lambda oLo): 1300 1301.5 nm Less less than or equal to (lambda oLo) Less less than or equal to 1322 1321.5 nm Zero Dispersion Slope (So): Less less than or equal to 0.092 ps/(nm squared times ps/(nm/2/ . km) Fiber Polarization Mode Dispersion Coefficient (PMD): Less less than or equal to 0.5 psec divided by square root km C2 -------------------------------------------------------------------------------------------------------------------- --------------------------------------------------------------------------------------------------- DISPERSION CALCULATION --------------------------------------------------------------------------------------------------- Dispersion Calculation -------------------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------------------- The agreement sets forth a detailed calculation of dispersion. -------------------------------------------------------------------------------------------------------------------- = D (L): approximately So [L - Lo4] ps/ (xx.xx), for 1200 nm less than or equal to L -- --- less than 4 [ L3] or equal to L = Operating Wavelength 1600 nm ---------------------------------------------------------------------------------------------------- ENVIRONMENTAL SPECIFICATIONS ------------------------------------------ -------------------------------- Environmental Test Induced --------------------------------------------------------------------- ENVIRONMENTAL TEST INDUCED Operating Temperature Range Condition Attenuation -60(degree)C CONDITION ATTENUATION -60C to +85(degree)C +85C (dBDB/kmKM) ------------------------------------------ -------------------------------- ------------------------------------------ -------------- ----------------- --------------------------------------------------------------------- 1310 nm 1550 nm ------------------------------------------ -------------- ----------------- ------------------------------------------ -------------- ----------------- --------------------------------------------------------------------- Temperature Dependence Less than or Less than or -60 degrees to +85 degrees C equal to 0.05 equal to 0.05 --------------------------------------------------------------------- Temperature-Humidity Cycling Less than or Less than or -10C to +85C, up to 98% RH equal to 0.05 equal to 0.05 --------------------------------------------------------------------- Water Immersion, 23C Less than or Less than or equal to 0.05 equal to Temperature Dependence 0.05 0.05 -60(degree)to +85(degree)C ------------------------------------------ -------------- ----------------- ------------------------------------------ -------------- ----------------- --------------------------------------------------------------------- Heat Aging, 85C Less than or Less than or equal to 0.05 equal to Temperature-Humidity Cycling 0.05 0.05 -10(degree)C to +85(degree)C--------------------------------------------------------------------- DIMENSIONAL SPECIFICATIONS STANDARD LENGTH (KM/REEL): 2.2 - 25.0 Exhibit C, up to 98% RH ------------------------------------------ -------------- ----------------- ------------------------------------------ -------------- ----------------- Less 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 Less 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 equal to Water Immersion, 23(degree)C 0.05 0.05 ------------------------------------------ -------------- ----------------- ------------------------------------------ -------------- ----------------- Less 0.8 micro m Cladding Non-Circularity: less than or Less than or equal to equal to Heat Aging, 85(degree)C 0.05 0.05 ------------------------------------------ -------------- ----------------- DIMENSIONAL SPECIFICATIONS Standard Length (km/reel): 2.2 1.0% [ Min. Cladding Diameter ] Defined as: [1 - 25.0---------------------- ] x 100 [ Max. Cladding Diameter ] MECHANICAL SPECIFICATIONS

Attenuation. Point Discontinuity Uncabled Fiber Attenuation Cells Point Discontinuity ------------------------------------------------ ------------------------- ---------------------- ----------------------- ---------------------------- Attenuation Cells No point of discontinuity greater than 0.10 dB at either 1310 nm (dB/km) or 1550 nm. ------------------------- ---------------------- ------------------------- ---------------------- ----------------------- ---------------------------- 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 plus or minus +/- 3 nm shall not exceed 2.1 dB/km. ------------------------- ---------------------- -------------------------------------------------------------- ----------------------- ---------------------------- Attenuation vs. Wavelength -------------------------------------------------------------- --------------------- ------------------- -------------------- ------------------- ------------------ Range Ref. lambda (lambda) Max Increase <- The attenuation in a given wavelength range does not (nm) (nm) alpha (alpha) (dB/km) not exceed the attenuation of the reference ------------------- ------------------- ------------------ 1285-1330 1310 0.05 wavelength ((lambda)) by more than the value (alpha). --------------------- ------------------- -------------------- --------------------- ------------------- -------------------- 1285-1330 1310 0.1 --------------------- ------------------- -------------------- --------------------- ------------------- -------------------- ------------------ 1525-1575 1550 0.05 --------------------- ------------------- -------------------- ----------------------------------------------------------------------------- ------------------- ------------------ Attenuation With Bending ----------------------------------------------------------------------------- -------------------- ----------------- ----------------- -------------------- ---------------- -------------- --------------- ------------------ Mandrel Number of Wavelength Induced <- The induced attenuation due to fiber wrapped Diameter Turns (nm) Attenuation fiber wrapped around a mandrel of a specified (nmmm) (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 (lambda ccf(lambda)ccf) o * Mode-Field Diameter (lambda ccf) less than lambda)ccf < 1260 nm 9.30 plus or minus +/- 0.50 mu m (mu)m at 1310 nm 10.50 plus or minus +/- 1.00 mu m (mu)m at 1550 nm o * Dispersion Zero Dispersion Wavelength (lambda o(lambda)o): 1300 1301.5 nm Less than or equal to <= (lambda o) Less than or equal to 1322 lambda)o <= 1321.5 nm Zero Dispersion Slope (So): Less than or equal to <= 0.092 ps/(nm squared times ps/(nm2 x km) Fiber Polarization Mode Dispersion Coefficient (PMD): Less than or equal to <= 0.5 psec divided by psec/square root km C2 -------------------------------------------------------------------------------------------------------------------- -2 of 8- Dispersion Calculation -------------------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------------------- The agreement sets forth a detailed calculation of dispersion. -------------------------------------------------------------------------------------------------------------------- ---------------------------------------------------------------------------------------------------------------------- Dispersion=D(lambda):approximately So/4 [(lambda)-(lambda)o to the 4th power/(lambda) to the 3rd power]ps/ (nm x km), for 1200 nm <=(lambda)<=1600 nm (lambda)=Operating Wavelength ---------------------------------------------------------------------------------------------------------------------- ENVIRONMENTAL SPECIFICATIONS ------------------------------------------ -------------------------------- Environmental Test Induced Attenuation Operating Temperature Range Environmental Test Condition Attenuation -60(degree)C to +85(degree)C (dB/km) ------------------------------------------ -------------------------------- ------------------------------------------ -------------- ----------------- -60(Degree)C to +85(Degree)C ----------------------------------------- ------------------------------ 1310 nm 1550 nm ------------------------------------------ -------------- ----------------- ------------------------------------------ -------------- ----------------- Less than or Less than or equal to equal to ----------------------------------------- ------------- ---------------- Temperature Dependence <= 0.05 <= 0.05 -60(degree)to +85(degree)C ------------------------------------------ -------------- ----------------- ------------------------------------------ -------------- ----------------- Less than or Less than or equal -60(Degree) to equal to +85(Degree)C ----------------------------------------- ------------- ---------------- Temperature-Humidity Cycling <= 0.05 <= 0.05 -10(degree)C -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 23(Degree)C <= 0.05 <= 0.05 ------------------------------------------ -------------- ----------------- ------------------------------------------ -------------- ----------------- Less than or Less than or equal to equal to ----------------------------------------- ------------- ---------------- Heat Aging, 85(degree)C 85(Degree)C <= 0.05 <= 0.05 ------------------------------------------ -------------- ----------------- ----------------------------------------- ------------- ---------------- DIMENSIONAL SPECIFICATIONS Standard Length (km/reel): 2.2 - 25.025.0 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