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 . k...
Attenuation. Each Optical Wavelength is delivered with appropriate optical characteristics connected to the Customer Premises Equipment. To ensure optimum performance of the link, the optical signal, in both directions, will be attenuated to desired specifications recommended by Rogers’ equipment vendor and Customer’s equipment vendor. Attenuation of the optical signal required at the Customer Premise Equipment beyond the demarcation point will be provided by the Customer.
Attenuation b) Distance Attenuation, Cdist (dB) -28 Cdist = - 20 x log (R / Ro) [2]
Attenuation. 2.1.1.1 *** 2.1.1.2 *** 2.1.1.3 *** 2.1.1.4 ***
Attenuation. 2.1.1.1 *** *** Page 7 of 18 27 *CONFIDENTIAL TREATMENT GRANTED -------------------------------------------------------------------------------- TITLE: Purchase Specification for SpecTran Incorporated *** Multimode Optical Fiber Supplied to Corning Incorporated -------------------------------------------------------------------------------- Test Procedure -------------- The attenuation shall be measured in accordance with ***
Attenuation. UNCABLED FIBER ATTENUATION CELLS -------------------------------------------- Attenuation Cells (dB/km) ---------------------------- Wavelength (nm) Standard ---------- ---------------------------- 1310 (less than/equal to) 0.40 1550 (less than/equal to) 0.30 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 (plus/minus) 3 nm shall not exceed 2.1 dB/km.
Attenuation. Maximum value between 1,285 and 1,330 nm. (spectral attenuation curve of a sample of the optical fibre used). - Maximum value of 1,550 nm. - Attenuation uniformity (predetermined premises). Chromatic dispersion: - Between 1,285 and 1,330 nm. (the particular values provided by the manufacturer should be provided). - At 1,550 nm. - Dispersion in polarisation mode.
Attenuation. 1. Toilet room, fire stair, and elevator shaft walls built to structure(deck) above
Attenuation. Attenuation causes a gradual reduction of intensity of the transmitted radiowave, which is mostly due to the spreading of signal energy with distance. Atmospheric gases cause additional absorption, which is negligible in most cases. Although water generally absorbs 2.4 GHz waves, water vapor, fog or even rain do not significantly contribute to attenuation, due to the size of water drops being much smaller than the wavelength (12,5 cm). In contrast, water-containing obstacles with a size compara- ble to the wavelength or larger will attenuate heavily. The attenuation introduced by obstacles strongly depends on the materials used and on the pathlength of the radiowave penetrating the obstacle. The reliability of a wireless communication link against effects of attenuation is determined by the senders transmit power as well as receivers sensitivity, the link budget. Establishing a sufficient link budget while maintaining low power consumption of the communication hardware is one of the basic chal- lenges in the field of wireless sensor networking. Typical values for common WSN hardware can be assumed as follows: Transmit Power: 10 dBm Receiver Sensitivity: -98 dBm Resulting link budget: 108 dBm Typical Attenuation values are Free space attenuation: 80 dB for a 100 m link (increases by 6dB when distance doubled) Plasterboard office wall: 3 dB Office window: 3 dB Brick wall: 6 dB
Attenuation. The attenuation of any pair shall meet the requirements of Table 6.3. * This term is used per NFPA 259 utilizing the maximum limits for potential heat of 3,500 Btu/lb (8.141 mJ/kg) per NFPA 90A. SPECIFICATION NO. APPROVED DATE PAGE NO. 5 52 The maximum attenuation at elevated temperatures of 40 degree C and 60 degrees C shall be verified using a factor of 0.4% increase per degree C. Attenuation measurements shall be in accordance with ASTM D 4566. Table 6.3 Horizontal UTP Cable ACR (Worst Pair, dB) Freq., MHz Attenuation, Max. NEXT, Min.* ACR* ------------------------------------------------------ 0.772 1.8 70 68 1.00 2.0 68 66 4.00 4.1 59 55 8.00 5.8 54 48 10.00 6.5 53 46 16.00 8.2 50 42 20.00 9.3 48 39 25.00 10.4 47 37 31.25 11.7 45 33 62.50 17.0 41 24 100.00 22.0 38 16 155.00 27.0 37 10 *Rounded to nearest dB.
