3Com 8 manual Connecting Hubs Using 10BASE-2, Checking Connections, Ohm terminator

Connecting Hubs Using 10BASE-2

Connect a 10BASE-2 ‘Y’ piece to each of your hubs

(Hub 8C only). Connect the ‘Y’ pieces with 10BASE-2 cable to form a single segment, as shown in Figure 7. Remember to terminate the two free ends of the segment by fitting terminators (end pieces).

To disconnect a 10BASE-2 cable, twist each connector counter-clockwise to unlock it, and remove it.

When using 10BASE-2 cable, it is important that both ends of the segment are properly terminated with 50 Ohm terminators (end pieces).

Only use 50 Ohm 10BASE-2 cables and a ‘Y’ piece for each hub. You can use ‘T’ pieces but ‘Y’ pieces provide optimum clearance of the other ports.

Checking Connections

When you have connected your hubs, power them on. The Port Status LEDs for the 10BASE-2 ports you have used should be off. If they are not, check your connections.

Figure 7 Correct Hub Connections Using 10BASE-2

50 Ohm

terminator

	‘Y’ piece
10BASE-2 50 Ohm cable.	50 Ohm
Minimum length of
	terminator
each cable is 0.5m (1.6ft)
Maximum segment length is 185m (607ft)
(from terminator to terminator)

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