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AIP Installation Prerequisites
Table 4 lists the factors that contribute to link loss and the estimate of the link loss value attributable
to those factors.
Table 4
Link Loss Factor
Higher order mode losses
Clock recovery module
Modal and chromatic dispersion Dependent on fiber and wavelength used
Connector
Splice
Fiber attenuation
Note
zero; this is the power margin. Results less than zero might have insufficient power to operate the
receiver.
Multimode Power Margin Example with Sufficient Power for Transmission
The following is an example of a multimode power margin calculation based on the following
variables:
•
•
•
•
•
Estimate the power margin as follows:
The value of 3.5 dB indicates that this link would have sufficient power for transmission.
10 Asynchronous Transfer Mode Interface Processor (AIP) Installation and Configuration
Estimating Link Loss
After calculating the power budget minus the data link loss, the result should be greater than
Length of multimode link = 3 kilometers (km), with a loss of 1.0 dB per km
4 connectors, each with a loss of 0.5 dB
3 splices, each with a loss of 0.5 dB
Higher order loss (HOL) of 0.5 dB
Clock recovery module (CRM), with a loss of 1.0 dB
PM = 11.5 dB – 3 km (1.0 dB/km) – 4 (0.5 dB) – 3 (0.5 dB) – 0.5 dB (HOL) – 1 dB (CRM)
PM = 11.5 dB – 3 dB – 2 dB – 1.5 dB – 0.5 dB – 1 dB
PM = 2.5 dB
Estimate of Link Loss Value
0.5 dB
1 dB
0.5 dB
0.5 dB
1 dB/km
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