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.
2 - 12 ONline Ethernet 24-Port 10BASE-T Module Installation Guide