Fiber Optic Cable Length Limitations
The 10BASE-F standard permits you to use fiber optic cables up to 2000 meters long. However, the fiber connection must meet the following criteria:
•Optical power budget (shown in Table 3)
•Ethernet repeater rules
For more information about simple rules for Ethernet network compliance, refer to Using the BayStack 10BASE-T Hubs.
The optical power budget is shown in Table 3. Power loss in the link cannot exceed the value for the type of fiber optic cable you are using.
Table 3. 10BASE-FL RDN Media Adapter Power Budget
Parameter | 62.5/125 ∝m | 50/125 ∝m |
| | |
Transmitted power (average) | –20 dBm | –25.7 dBm |
Receiver sensitivity (average) | –32.5 dBm | –32.5 dBm |
Optical power budget | 12.5 dB | 6.8 dB |
| | |
Only in-line fiber-to-fiber connections (a connection between two fibers terminated with fiber connectors, using a fiber-to-fiber connector) count against the optical power budget. The loss in a fiber connection at the ends of the link are included in the optical power budget and does not count as an in-line connection.
