HP J3128A AdvanceStack 10Base-T Hub-8E Installation And Reference Manual page 11

Using Twisted-Pair Cable
To expand your network, the hub can be cascaded to another hub by
using the Cascade port. You can connect up to 4 hubs together by
using this port. The following illustration shows two hubs chained
together.
Standard twisted-pair cable.
No mimimum cable length.
Maximum length: 100 meters.
(This type of connection is also called "MDI/MDI-X" where MDI is the
hub-to-hub connection and MDI-X is the hub-to-a-device connection.
A device is a printer, computer, or other Ethernet product.)
C a u t i o n
If you connect cable to both the Cascade
port and port 8, the connections will not
work. The two ports cannot be used
simultaneously.
Use "straight-through" cable not "cross-
over cable" between the hubs when using
the Cascade port.
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