3Com 3C16792 User Guide - Page 20

counter-clockwise to unlock it, and remove it.

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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 10BASE-2 50 Ohm cable. Minimum length of each cable is 0.5m (1.6ft) Maximum segment length is 185m (607ft) (from terminator to terminator) 'Y' piece 50 Ohm terminator 20

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20
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
10BASE-2 50 Ohm cable.
Minimum length of
each cable is 0.5m (1.6ft)
Maximum segment length is 185m (607ft)
(from terminator to terminator)
‘Y’ piece
50 Ohm
terminator