The Power-up Sequence
41
Table 13
Unit Status Colors
If there is evidence of a problem, see
“Solving Problems Indicated by
LEDs”
on
page 78
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.
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 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 14
.
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.).
Color
State
Green
The Switch is powered-up and operating normally.
Green flashing
Self Test (POST) or Software Download is in progress.
Red
The Switch has failed its Power On Self Test (POST).
Off
The Switch is not receiving power.
Summary of Contents for 3CR17251-91 - Switch 5500G-EI Stackable Gigabit...
Page 8: ......
Page 48: ...48 CHAPTER 2 INSTALLING THE SWITCH...
Page 70: ...70 CHAPTER 3 SETTING UP FOR MANAGEMENT...
Page 76: ...76 CHAPTER 4 CREATING AN XRN STACKING FABRIC...
Page 84: ...84 CHAPTER 5 PROBLEM SOLVING...
Page 122: ...122 APPENDIX A SAFETY INFORMATION...
Page 126: ...126 APPENDIX B PIN OUTS...
Page 140: ...140 APPENDIX C TECHNICAL SPECIFICATIONS...
Page 148: ......
