Chapter 4 UCM Communication-Link Wiring
68 BMTW-SVN01F-EN
optic cables and professionally spliced and/or terminated cables should
ensure minimal decibel loss.
To calculate the system loss, subtract the cable loss, splice loss, termina-
tor loss, and patch panel loss from the power budget. The example below
shows typical values for the UCM communication link.
power budget – system safety margin = available budget
14 dB – 3 dB = 11 dB (available budget)
available budget: 11 dB
cable loss: – 7.5 dB (1 km at 3.75 dB/km)
allowance for splice loss: – 1 dB (2 at .5 dB)
allowance for end connectors: – 1 dB (2 at .5 dB)
allowance for patch panel: – 1 dB (2 at .5 dB)
excess margin: = 0.5 dB
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