3com 3C16987 User Manual
30
C
HAPTER
2: I
NSTALLING
THE
S
WITCH
If there is evidence of a problem, see
Choosing the
Correct Cables
Correct Cables
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
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
Table 5 LED colors
Color
State
Green
The Switch is powered-up and
operating normally
operating normally
Yellow
The Switch has failed its Power On Self
Test. This occurs if any of the ports fail
during power-up.
Test. This occurs if any of the ports fail
during power-up.
Off
The Switch is not receiving power.
green
flashing green
= enabled, link OK
= disabled, link OK
= disabled, link OK
10BASE-T / 100BASE-TX
Unit
3
3
4
4
6
6
5
5
7
7
8
8
9
9
10
10
11
11
12
12
1
1
2
2
3
5
1
4
7
6
8
2
13
13
14
14
15
15
16
16
17
17
18
18
19
19
20
20
21
21
22
22
23
23
24
24
SuperStack II
Switch 3300 SM
®
Power/Self Test
6x
7x
18x 19x
1x
13x
12x
24x
Packet
Status
Packet
Status
1000BASE-SX
Hub
Switch
MDI (Straight-through) Cable
MDIX (Cross-over) Cable
Switch
Workstation
Server