Connecting Hubs Together; Twisted-Pair Cascade Connections - HP ProCurve 10Base-T 12 Installation Manual

Connecting Hubs Together

Twisted-Pair Cascade Connections

To expand your network, the hub can be connected to other hubs with straight-
through cable by using the Media Dependent Interface (MDI/MDI-X) switch.
The MDI/MDI-X switch controls how the signals are sent through the twisted-
pair cable connected to Port 1. The hub is shipped with the switch in the MDI-
X position. The switch has two positions:
In the MDI position, use Port 1 to connect your hub to another hub. In
this position, the hub reverses the Tx and Rx port pairs for you. This allows
you to use "straight-through" category 3 or 4 cable rather than "cross-over"
cable to connect two hubs together. The cable length can be up to 100
meters. Category 5 cable length can be up to 150 meters.
Be sure that only one of the two hubs is using an MDI port; the hub-to-
device connection must always have MDI at one end (usually a trans-
ceiver), and MDI-X at the other end (usually a hub or switch), when
connecting the two with a straight-through cable.
In the MDI-X position, use Port 1 to connect your hub to a PC or similar
device using "straight-through" cable. In this position, the port is wired
the same as all other twisted-pair ports on the hub. Cable lengths for these
connections can be up to 100 meters.
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ProCurve 10Base-T Hub 24M
Xcvr
HP J3303A
7 8 9 10 11 12 19 20
Power
Act
Reset Clear
Fault Console
Figure 1-5. The MDI/MDI-X Switch
MDI/MDI-X Switch
1
15 16 17 18
Port 1 Only
10 Mbps Xcvr Port
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MDI-X MDI
Col
(out) (In)
7X
Installing the Hub
Installing Your Hub
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24X
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