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 -------------------- ----------------- ----------------- -------------------- -------------------- ----------------- ---------------...
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. The attenuation of the interconnecting cable (including any digital distribution frame or interconnecting equipment) shall not exceed 6 dB at 1024 KHz.
Attenuation. Distance Attenuation, Cdist (dB) -15 Cdist = - 20 x log (R / Ro) [2]
Attenuation. The above tests shall be evaluated for pass or fail results and documented as such on the final test document.
Attenuation. 100% @ 1310 nm < 0,35 dB/km.; @ 1550nm < 0,21 dB/km
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. Toilet room, fire stair, and elevator shaft walls built to structure(deck) above
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.
6.4 Near End Cross Talk (NEXT) Loss The NEXT loss shall meet the requirements of Table 6.3. NEXT measurement shall be in accordance with ASTM D 4566.
6.5 Attenuation to Cross Talk Ratio (ACR)
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.
