Link attenuation equation and graphs :: | 43/55

| Link attenuation is calculated as: Link Attenuation = Cable Attenuation + Connector Insertion loss + Splice Insertion loss (16) where: Cable Attenuation (dB) = Attenuation Coefficient (dB/km) ´ Length (km) Attenuation Coefficients are: 3.5 dB/km @ 850 nm for multimode
1.5 dB/km @ 1300 nm for multimode
0.5 dB/km @ 1310 nm for singlemode outside plant cable
0.5 dB/km @ 1550 nm for singlemode outside plant cable
1.0 dB/km @ 1310 nm for singlemode inside plant cable
1.0 dB/km @ 1550 nm for singlemode inside plant cable

Connector Insertion loss (dB) = number of connector pairs ´ connector loss (dB)

Example:
= 2 ´ 0.75 dB
= 1.5 dB

Splice Insertion loss (dB) = number of splices (S) ´ splice loss (dB)

Example:
= S ´ 0.3 dB

For example, a horizontal cross-connect (HC) to intermediate cross-connect (IC) multimode link segment of the allowable 300 m (984 ft) length without any splices shall have attenuation test results of less than or equal to 2.6 dB at 850 nm and 2.0 dB at 1300 nm.

Yet in another example, an intermediate cross-connect (IC) to main cross-connect (MC) multimode link segment of the allowable 2 km (6560 ft) length without any splices shall have attenuation test results of less than or equal to 8.5 dB at 850 nm and 4.5 dB at 1300 nm.

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