Chapter 2. Installing the 8237
2-5
5
Label the cables so that it will be easy to identify the 8237 port at the other
end of the cable if you have to troubleshoot a network problem. At the end
of the cable nearest the attached device, place a label containing a unique
identifier for the cable, the location and MAC address of the 8237 at the
other end of the cable, and the number of the 8237 port to which the device
is connected.
Connecting Hubs with Stack Link Cables
If you will be configuring multiple 8237s into one or more stacks, you will need the
Stack Link cable provided. One cable is required for every two hubs that will be
interconnected. This cable is illustrated in Figure 2-3.
Figure 2-3. 8237 Stack Link Cable (P/N 86H0021)
If you will be connecting multiple 8237s using the Stack Link cable, follow the steps
below. If not, go to "Powering On the 8237" on page 2-7.
1
Connect one end of the cable to the Stack Link In port of the 8237 that is
physically nearest the top of the stack. Be sure that the cable is firmly
seated and that the latches are engaged.
2
Connect the other end of this cable to the Stack Link Out port of the 8237
that is physically next lowest in the stack. Be sure that the cable is firmly
seated and that the latches are engaged.
3
Repeat the above steps for each hub in the stack, progressing downward.
Note: Never allow a Stack Link cable to remain partially attached. If a Stack
Link cable is disconnected from one 8237 but is left connected to the other
8237, Ethernet traffic to all backplane buses will be disrupted.
In Figure 2-4 on page 2-6, the topmost 8237 is a Model 002 and the two lower units
are Model 001s. Note the Stack Link cable connections. In this example, the Model
002 would be identified as occupying position 1, the Model 001 in the middle would
occupy position 2, and the Model 001 on the bottom would occupy position 3.
Summary of Contents for 8237
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