IBM 8239 Token-Ring Stackable Hub, Руководство по установке и эксплуатации

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3. Label the cable at the lobe port with a unique identifier so that it will be easy to
identify the location of the device at the other end of the cable should you have
to troubleshoot a network problem.
4. Connect the other end of the cable to the end station faceplate or other
intermediate connection point, as required.
Label the cables at the attaching-device end.
Cabling a Stack
Note: The stack cable shipped with the 8239 Model 1 is longer than the cable
shipped with the Model 2, providing the means to connect the top 8239 to
the bottom 8239.
To build a hub stack containing two to eight 8239s:
1. Beginning with the 8239 at the top of the stack, use a stack cable to connect
stack OUT on the top 8239 to stack IN on the next hub below in the stack.
Figure 2-4. Stack Building
2. Using stack cables, continue to connect stack OUT on each 8239 to stack IN
on the next 8239 in the stack.
3. Use the stack cable to connect stack IN on the top 8239 to stack OUT on the
bottom 8239.
To prevent network disruptions, be sure you connect stack cables at both ends.
Connecting an ASCII Terminal or Modem to the EIA-232 Port
If you are going to access the 8239 without using the data network, you must
attach either an ASCII terminal for local access to the 8239 or a modem for remote
access.
ASCII Terminal
To attach an ASCII terminal, follow these steps:
1. Connect one end of the special null-modem cable (not provided) to the EIA-232
port of the 8239 that is going to be used.
2. Connect the other end of the cable to the communications port of your ASCII
terminal
Chapter 2. Installing the 8239 Hardware
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