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DEFINITY Enterprise Communications Server Release 6
Installation and Test for Multi-Carrier Cabinets
555-230-112
Issue 5
May 1998
Connecting Fiber Optic Cables
Page A-7Optical Cross-Connect Hardware
A
When to Use Single-Mode Fiber Attenuators
For 300A operation, single-mode fiber loss must be between 10dB and 17dB (at
1300 to 1310 nm). Since saturation may occur if distances are short, attenuators
may be required if the total loss on the fiber link is less than 10dB. Perform an
OTDR or Optical Power Meter test to determine specific requirements. Typically,
fiber distances of 9 miles (14 km) or less require an in-line attenuator.
Using Figure A-1
, find the line that most closely matches the customer’s fiber
plant, or overlay your own load line. Using the measured loss of 0.33dB/km as an
example, install a 10dB attenuator if the distance is about 9 miles (14 km) or less.
Use a 5dB attenuator if the distance is from 9 to 18 miles (14.4 to 30 km).
Figure A-1. Single-Mode Attenuator Requirements