3Com 3C16792 User Guide - Page 21
Connecting Hubs Using 10BASE-T, Checking Connections
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Connecting Hubs Using 10BASE-T You can connect hubs together with 10BASE-T in a number of ways, but for simplicity we recommend the following method, as shown in Figure 8: 1 Starting from the bottom, connect the port 8 of the lower hub to port 7 of the hub immediately above. Repeat this for each hub. 2 Set all Uplink/Normal switches to Uplink (in) except for the top hub (the one with port 8 not connected to another hub). This unused port can be connected to a workstation provided that the Uplink/Normal switch is set to Normal (out). If you suspect there is a problem, refer to "Problem Solving for the Hub 8 and 8C" on page 22. Figure 8 Correct Hub Connections Using 10BASE-T Switch set to Normal (out) Checking Connections When you have connected your hubs, power them on. The Port Status LEDs for the 10BASE-T ports you have used should be green. If they are not, check your connections. If the 10BASE-2 port is not used and is not terminated, the LED should be yellow showing that it has partitioned. This is correct operation. Spot Checks At frequent intervals, visually check that: s The Alert LED is not lit - this is the best way to find out if there are problems with your network. s Case vents are not obstructed. s Cabling is secure and not pulled taut. 21 Switch set to Uplink (in) Switch set to Uplink (in) 10BASE-T cable with RJ-45 connectors. Maximum length of each cable is 100m (328ft)