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30
C
2: I
HAPTER
NSTALLING THE
Choosing the
Correct Cables
S
WITCH
Table 5 LED colors
Color
State
Green
The Switch is powered-up and
operating normally
Yellow
The Switch has failed its Power On Self
Test. This occurs if any of the ports fail
during power-up.
Off
The Switch is not receiving power.
If there is evidence of a problem, see
LEDs"
on
page
31.
All of the ports on the front of the Switch 3300 SM are configured as
MDIX (cross-over). If you want to make a connection to another MDIX
port, you need a cross-over cable. Most of the 10BASE-T and
100BASE-TX ports on 3Com devices are MDIX-only. Many ports on
workstations and servers are configured as MDI (straight-through). If you
want to make a connection to an MDI port, you need to use a standard
straight-through cable. This is illustrated in
Figure 10 Connecting other devices to the Switch 3300 SM
1x
13x
MDI (Straight-through) Cable
Workstation
Server
"Solving Problems Indicated by
Figure
10BASE-T / 100BASE-TX
6x
7x
12x
green
= enabled, link OK
flashing green
= disabled, link OK
1
2
3
4
5
6
7
1
2
3
4
5
6
7
13
14
15
16
17
18
19
13
14
15
16
17
18
19
18x 19x
24x
MDIX (Cross-over) Cable
Switch
Switch
10.
1000BASE-SX
Unit
8
9
10
11
12
Packet
1
2
8
9
10
11
12
Status
3
4
20
21
22
23
24
Packet
5
6
Power/Self Test
SuperStack II
®
7
8
20
21
22
23
24
Status
Switch 3300 SM
Hub
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