Specifications

RADring
Installation & Operation Manual Ethernet Design Considerations
3/11/98 12:25 Fiber Optic Design Considerations 7-7
Connector losses decrease as fiber diameter increases.
Example: Optical link (ring segment) with 3 km of 100/140 micron fiber.
Cable Loss 3 X 4.5dB/km = 13.5dB
Connector Loss 2 X 1.5dB = 3.0dB
Total Losses 16.5 dB
Link Budget 18dB
Link Margin (aging,, splices) 1.5dB
The link margin indicates the reserve for unexpected increases in link
attenuation, such as splices, increased attenuation due to fiber aging, or
decreased transmit power due to component aging.
Fiber Optic Calculation Example with Connectors and Splices
Fiber Optic Module
Over 50, 62.5 or 100 microns fiber
Two splices and one connector
Standard 850 nm 1300 nm
Fiber Type 50 microns 62.5 microns 100 microns 9 microns (singlemode)
Input Power -22 dBm -18 dBm -14 dBm -18 dBm
Sensitivity -32 dBm -32 dBm -32 dBm -33 dBm
budget 10 dB 14 dB 18 dB 15 dB
Conn. Loss 0.8 dB 0.8 dB 0.5 dB 1.0 dB
Splice. Loss 0.4 dB 0.4 dB 0.4 dB 0.4 dB
Aging 2.0 dB 2.0 dB 2.0 dB 2.0 dB
Rem. Budget 6.8 dB 10.8 dB 15.1 dB 11.6 dB
Att dB/km 3.0 dB 3.5 dB 4.0 dB 0.7 dB
Max. Distance 2.3 km 3.1 km 3.7 km 16.5 km