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Designing and Expanding the Network 2 - 23
❑ Incoming signal from Transceiver A to the 10BASE-T Module =
420 m.
❑ Outgoing signal from the 10BASE-T Module to Transceiver B =
165 m (420 m + 165 m = 585 m).
4. Subtract all cable lengths between the two transceivers (calculate
copper length the same way you do for fiber). In this example, the
total cable distance equals 1725 meters.
If the result from step 4 is greater than zero, the configuration is
within legal Ethernet limits (Rule 5).
The calculation in this example shows that 770 meters remain for
expansion in this configuration. Therefore, this configuration is legal.
10BASE-FB Fiber Backbone, 10BASE-FL to-the-Desk
Use the information in this section when designing your network using
10BASE-FB fiber as the network backbone and 10BASE-FL Modules for
to-the-desk connectivity. This section assumes that the backbone is
comprised of 3Com fiber products, such as the ONline Ethernet Fiber
Module or ONline Ethernet 10BASE-FB Module. 3Com Ethernet Fiber
modules and transceivers conform to the IEEE 10BASE-F standard.
The rules that apply to building this type of network have been covered in
the previous sections. The following two additional rules apply when using
ONline Ethernet Fiber Modules:
1. The equivalent fiber distance for the Fiber Module and the
Port-Switching Fiber Module is:
– 140 meters for signals that externally enter the module
– 50 meters for signals that internally enter the module
through the ONline Concentrator backplane