3Com 3C17400 User Manual - Page 24

Choosing the Correct Cables

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24 CHAPTER 2: INSTALLING THE SWITCH Table 7 Self Test LED colors Color Green Red Red Flashing Green Flashing Off State The Switch is powered-up and operating normally. POST Test has failed A fan has failed There is a test in progress. Unit is booting-up or not powered. If there is evidence of a problem, see "Solving Problems Indicated by LEDs" on page 46. CAUTION The Switch has no ON/OFF switch; the only method of connecting or disconnecting mains power is by connecting or disconnecting the power cord. Choosing the Correct Cables All of the 10/100/1000 Mbps ports on the Switch are Auto-MDIX, that is they have a cross-over capability. The port can automatically detect whether it needs to operate in MDI or MDIX mode. Therefore you can make a connection to a port with a straight-through (MDI) or a cross-over cable (MDIX). The Auto-MDIX feature only operates when auto-negotiation is enabled. If auto-negotiation is disabled, all the Switch ports are configured as MDIX (cross-over). If you want to make a connection to another MDIX port, you need a cross-over cable. 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. See Table 8. 3Com recommends that you use Category 5 twisted pair cable - the maximum segment length for this type of cable is 100 m (328 ft).

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24
C
HAPTER
2: I
NSTALLING
THE
S
WITCH
Table 7
Self Test LED colors
If there is evidence of a problem, see
“
Solving Problems Indicated by
LEDs
”
on
page 46
.
CAUTION
The Switch has no ON/OFF switch; the only method of
connecting or disconnecting mains power is by connecting or
disconnecting the power cord.
Choosing the Correct
Cables
All of the 10/100/1000 Mbps ports on the Switch are Auto-MDIX, that is
they have a cross-over capability. The port can automatically detect
whether it needs to operate in MDI or MDIX mode. Therefore you can
make a connection to a port with a straight-through (MDI) or a cross-over
cable (MDIX).
The Auto-MDIX feature only operates when auto-negotiation is enabled.
If auto-negotiation is disabled, all the Switch ports are configured as
MDIX (cross-over). If you want to make a connection to another MDIX
port, you need a
cross-over
cable. 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. See
Table 8
.
3Com recommends that you use Category 5 twisted pair cable — the
maximum segment length for this type of cable is 100 m (328 ft).
Color
State
Green
The Switch is powered-up and operating normally.
Red
POST Test has failed
Red Flashing
A fan has failed
Green Flashing
There is a test in progress.
Off
Unit is booting-up or not powered.