Placing Units On Top of Each Other 23
Placing Units On Top of Each Other

If the Switch units are free-standing, up to eight units can be placed one

on top of the other. If you are mixing a variety of SuperStack® 3 Switch

and Hub units, the smaller units must be positioned at the top.

If you are placing Switch units one on top of the other, you must use the

self-adhesive rubber feet supplied. Apply the pads to the underside of

each Switch, sticking one in the marked area at each corner. Place the

Switch units on top of each other, ensuring that the feet of the upper unit

line up with the recesses of the lower unit.

Stacking Units Up to four Switch 4200 Family units can be stacked together and then

treated as a single manageable unit with one IP address. Any

combination of Switch 4200 Family units is allowed in a single stack. The

units are connected together via the 10/100/1000BASE-T ports on the

front of the unit as shown in Figure 6. Starting from the base of the stack,

the port marked with ‘up’ is connected to the port marked with ‘down’

on the unit above. Cable lengths of between 14 cm (5.5 in) and

100 m (328 ft) can be used for stacking.

Figure 6 Stacking example

The unit LEDs will display the unit number in the stack, from 1 at the

bottom to 4 at the top.

3Com recommends that when you add a new unit to a stack, you should

first initialize it to factory default settings.

Any Switch 4200 unit can be added to the stack, including the Switch

4226T, the Switch 4250T and the Switch 4228G. You must install the

latest software version on all units in the stack.

Power/
SelfTest
Alert
21
91022
1123 1224
8
20
113
197
18
6
17
5
16
4
153
14
2
26/Down
25/Up
1
2
3
4
Unit
Power/
SelfTest
Alert
21
91022
1123 1224
8
20
113
197
18
6
17
5
16
4
153
14
2
26/Down
25/Up
1
2
3
4
Unit
3C17304ASuperstack3Switch4200 28-Port
Power/
SelfTest
Alert
21
91022
1123 1224
8
20
113
197
18
6
17
5
16
4
153
14
2
26/Down
25/Up
1
2
3
4
Unit
3C17302ASuperstack3Switch420050-Port
8
32
125
31
7
30
6295
28
427
3
26
2
49 50
16
40
933
39
15
38
14
37
13361235
11
34
10
24
48
1741
47
23462245
21
44
20
43
19
42
18
Up
Down
Alert
Power/
SelfTest
Unit
1
2
3
4
27
28
27 28
27
28
27 28
3C17304ASuperstack3Switch420028-Port
3C17300ASuperstack3Switch420026-Port
DUA1730-0AAA03.book Page 23 Thursday, November 17, 2005 12:17 PM