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2 - 12 ONline Ethernet 24-Port 10BASE-T Module Installation Guide
2. Calculate the equivalent distances for each concentrator, and
subtract the total from 4200.
3. Subtract all cable lengths between the two transceivers and if the
result is greater than zero, the configuration is within legal Ethernet
limits.
For the configuration shown in Figure 2-3 to work, ensure the equivalent
fiber distance between Transceiver A and Transceiver B is less than 4200
meters.
As shown in the calculation, there are still 1510 meters left for expansion in
this configuration. Therefore, this configuration is legal.
10BASE-T Backbone, 10BASE-T To-The-Desk
In constructing a twisted pair backbone:
❑ Ensure there are no more than eight 10BASE-T modules in the path
between any two transceivers (Ethernet four-repeater rule). Each
10BASE-T module counts as 1/2 of a repeater unless the signal goes
in one port and out another port on the same module. In that case,
the module counts as a full repeater.
❑ Add a bridge if you have more than eight 10BASE-T modules serially
connected. Each bridge creates a subnetwork. Each subnetwork can
have its own 4200 meter network diameter.
Figure 2-4 shows a possible unshielded twisted pair network using 24-Port
Modules and 24-gauge cable.