3com 5500-EI User Manual
44
C
HAPTER
2: I
NSTALLING
THE
S
WITCH
Table 17 Unit Status Colors
If you encounter a problem, see the section entitled “Solving Problems
Indicated by LEDs” on page 82 for a list of suggested solutions.
Indicated by LEDs” on page 82 for a list of suggested solutions.
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.
connecting or disconnecting mains power is by connecting or
disconnecting the power cord.
Choosing the Correct
Cables
All of the ports on the switch are Auto-MDIX, that is, they have a
cross-over capability. These ports can automatically detect whether to
operate in MDI or MDIX mode. Therefore, you can make a connection to
one of the ports with a straight-through (MDI) or a cross-over (MDIX)
cable.
cross-over capability. These ports can automatically detect whether to
operate in MDI or MDIX mode. Therefore, you can make a connection to
one of the ports with a straight-through (MDI) or a cross-over (MDIX)
cable.
The Auto-MDIX feature only operates with auto-negotiation 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 18.
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 18.
3Com recommends that you use at least Category 5 twisted pair cable.
The maximum segment length for this type of cable is 100 m (328 ft.).
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.
Green flashing
The Power On Self Test (POST) is in process, or
software is downloading.
software is downloading.
Red
The switch has failed its Power On Self Test (POST).
Off
The switch is not receiving power.
10014925-AD_S5500_GSG.book Page 44 Thursday, August 16, 2007 12:29 PM