Accton Technology ES3002-TF manual Fast SwitcHub-2se User’s Guide

Fast SwitcHub-2se User’s Guide

For a sample calculation, assume the following values:

∙cable gauge - 62.5/125 mm, which means a 13 dB power budget,

∙2 patch panels between the switches, each with 0.5 dB power loss, and

1 splice with 0.4 dB power loss (i.e., 2 * 0.5 + 0.4 = 1.4 dB power loss for intervening devices), and

∙inherent power loss in the cable is 4.5 dB/km

The maximum cable length is therefore:

m ≤ 13 dB - 1.4 dB ≤ 2.58 km

4.5dB/km

ΙWhen the 100BASE-FX link is used for a dedicated connection (i.e., full-duplex communications), cable length should not exceed 2 kilometers. However, when the link is used for a shared collision domain (i.e., half-duplex communications), cable length should not exceed 412 meters (IEEE 802.3u).

Note: Even though your calculations for power loss may indicate a longer permissible length based on signal strength (as seen in the preceding example), we advise remaining within the recommended limits.

3.Set the communication mode via the Configure button to full-duplex or half-duplex mode to match the connected device. (Refer to Setting the

Communication Mode in Chapter 3.)

2-4 Setup and Configuration