3Com 3C16723A, 3C16721A Connecting 100BASE-TX Hubs, Connecting to 10BASE-T Networks, Spot Checks

Connecting 100BASE-TX Hubs

You can connect two OfficeConnect hubs together, as seen in Figure 4, with 100BASE-TX in a number of ways, but for simplicity we recommend the following method:

1Connect the highest-number port (port 4 on Hub 4, port 8 on Hub 8, port 12 on Hub 12) of the lower hub to any port of the upper hub.

2Set the Uplink/Normal switch on the lower hub to Uplink (in). If you use the highest-number port of the upper hub ensure that its Uplink/Normal Switch is set to Normal.

Figure 4 Correct Hub Connections Using 100BASE-TX

Switch set to		Uplink/Normal
		8
Normal (out)
Switch set to
Uplink (in)
			1X
	POWER	Uplink/Normal
		100BASE-TX cable	1X
		with RJ-45 connectors

Connecting to 10BASE-T Networks

Your OfficeConnect Hub can be connected to a 10BASE-T network through an OfficeConnect switch (for example, an OfficeConnect Dual Speed Switch 8).

Checking Hub Connections

When you have connected your hubs, power them on. The Port Status LEDs for the ports you have used on the hubs should be green. If they are not, check your connections and the settings of the Uplink/Normal switches.

Spot Checks

At frequent intervals, visually check that:

■The Alert LED is off — this is the best way to find out if there are problems with your network.

■Case vents are not obstructed.

■Cabling is secure and not pulled taut.

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