3com 3C172203 사용자 설명서
24
C
HAPTER
2: I
NSTALLING THE
S
WITCH
Table 7
Power/Self Test LED colors
If there is evidence of a problem, see “Solving Problems Indicated by
LEDs” on page 46.
LEDs” on page 46.
Connecting a
Redundant Power
System
You can connect a SuperStack 3 Advanced Redundant Power System
(3C16071B) to the Switch. This unit, which is also known as an RPS, is
designed to maintain the power to your Switch if a power supply failure
occurs.
(3C16071B) to the Switch. This unit, which is also known as an RPS, is
designed to maintain the power to your Switch if a power supply failure
occurs.
For normal redundancy, the unit requires one Type 2A Power Module
(part number 3C16074A). For full redundancy, the unit requires two type
2A Power Modules combined using a Type 2 Y-Cable.
(part number 3C16074A). For full redundancy, the unit requires two type
2A Power Modules combined using a Type 2 Y-Cable.
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.
CAUTION: The Switch can only use a SuperStack Advanced Redundant
Power System output.
Power System output.
Choosing the Correct
Cables
All of the ports on the front of the Switch 4400 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).
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 an automatic cross-over cable. Many ports on
workstations and servers are configured as MDI (straight-through). If you
MDIX (cross-over). If you want to make a connection to another MDIX
port, you need an automatic cross-over cable. Many ports on
workstations and servers are configured as MDI (straight-through). If you
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.
17204ua.book Page 24 Monday, August 13, 2001 11:28 AM