Instruction manual

Hub Components
893-839-C 1-11
ST 10BASE-FL
The BayStack Model 105 fiber hub straight-tip (ST) bayonet-type fiber optic
cable connectors are compatible with 62.5/125 µm or 50/125 µm multimode
fiber optic cables. The 10BASE-F standard permits you to use fiber optic cables
up to 2000 meters long. However, the fiber connection must meet the following
requirements:
• Optical power budget (see T
able 1-7)
• Ethernet repeater rules
For more information about Ethernet repeater rules, refer to “Simple Rules for
Ethernet Network Compliance” on page 3-2. For information about complex
Ethernet networks, refer to Bay Networks Connectivity Guide (Bay Networks
part number 345-1103-BK).
T
able 1-7 lists the optical power budget for the 10BASE-FL ports.
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 is
included in the optical power budget and does not count as an in-line
connection. Refer to Table A-1 on page A-3 for a listing of the maximum
(total) distances allowed for fiber connections.
Table 1-7. Optical power budget for fiber ports
Port connectors Parameter 62.5/125 µm 50/125 µm
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
TX RX
5602
893-839-CBook Page 11 Thursday, December 12, 1996 4:18 PM