HP 10-Base-T Instalační manuál stáhnout pdf (Strana 21)

1-9

Installing the Hub

Installing Your Hub

Installing the Hub

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.

Figure 1-5. The MDI/MDI-X Switch

10 MbpsXcvr Port

MDI-X

(out) (In)

MDI

Port 1 O nl y

13X

19X

14X

20X

15X

21X

16X

10X

22X

17X

11 X

23X

18X

12X

24X

Xcvr

Reset

ConsoleFault

Power

Clear

Act

Col

ProCurve 10Base-T Hub 24M

HP J3303A

MDI/MDI-X Switch

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 53 54

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