17 Ethernet Option Board
17-40
CP1E CPU Unit Software User’s Manual(W480)
Environment Precautions
• Do not install the hub near devices that generate noise.
• Do not install the hub in locations subject to high temperature or high humidity.
• Do not install the hub in locations subject to excessive dirt and dust or to oil mist or other contam-
inants.
If more hub ports are required, they can be added by connecting more than one hub. There are two
possible connection methods for hubs: Cascade and stacked.
Cascade Connections
• Connect two hubs to each other as follows:
Connect an MDI port to an MDI-X port with a straight cable;
Connect two MDI ports with a cross cable;
Connect two MDI-X ports with a cross cable.
Note It is very difficult to distinguish cross cables and straight cables by appearance. Incorrect cables will cause
communications to fail. We recommend using cascade connections with straight cables whenever possible.
• With cascade connections, up to 5 segments can be connected using up to 4 repeaters (i.e., 4
hubs).
Stack Connections
• Connect the hubs using special cables or special racks.
• Normally there is no limit to the number of hubs in a stack, and each stack is treated as one hub.
Some hubs, however, are limited in the number of hubs per stack.
Precaution on Hub Installation
Hub Connection Methods
Hub
Four stackable hubs
Two stackable hubs
Stack cable
Stack cable
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