3Com 3C16702A manual Connecting Hubs Using 10BASE-T, Checking Hub Connections, Spot Checks

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:

Figure 4 Correct Hub Connections Using 10BASE-T

1	Starting from the bottom, connect port 16 of the lower
	hub to port 15 of the hub immediately above. Repeat for
	each hub (as shown in Figure 4).
2	Set all Uplink/Normal switches to Uplink (in) except for
	the top hub (the one with port 16 not connected to
	another hub). This unused port can be connected to a

Switch set to Normal (out)

PO
W
ER	8X
	COAX
	Up
	lin
	k/No
	rmal
	16

10	BASE
	-T

workstation provided that the Uplink/Normal switch is set

to Normal (out).

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

Switch set to

Uplink (in)

PO
W
ER		8X
	COAX	Up
		lin
		k/No
		rmal

10	BA
	SE
	-T

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.

10BASE-T cable

with RJ-45 connectors.

Maximum length is

100m (328ft)

PO
W
ER	8X
	COAX
	Up
	lin
	k/No
	rmal

10	BA
	SE
	-T

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