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Ci sco Catalyst 4900M Swit ch I nst allati on Guide
78-18350-02
Chapter 1 Product Overvi ew
Catal yst 4900M Half -Card Modules
For safety reas ons, the AC power supp ly must be switched off and unplug ged befo re it is removed from
a chassis or inserted in to a chassis. DC supp lies should have power shut off from the sou rce before they
are removed.
a chassis or inserted in to a chassis. DC supp lies should have power shut off from the sou rce before they
are removed.
If only o ne power supply is used, y ou must use the supplied blank faceplate to cover the empty power
b ay. Th e blank power su pply co ver maintains EMI s hield in g and p roper air flow thro ugh the chassis.
b ay. Th e blank power su pply co ver maintains EMI s hield in g and p roper air flow thro ugh the chassis.
Environmental Monitoring of the Power Supplies
Using th e environmental mo nitorin g and rep orting fu nctio ns, you can maintain normal system operation
by res olving adverse environmental condition s p rior to lo ss o f operation.
by res olving adverse environmental condition s p rior to lo ss o f operation.
Each power supply mo nitors its own temp eratu re an d output vo ltages. The Catalyst 4900 M switch sen ses
th e operating condition o f the power supply and repo rts status throu gh software.
th e operating condition o f the power supply and repo rts status throu gh software.
Power Management for the Catalyst 4900M Switch
You can select either AC-inpu t or DC-input p ower su pplies for your switch. Th e Catalyst 4900M switch
su pports th e following power supplies:
su pports th e following power supplies:
•
1 000 W AC-in put
•
1 000 W DC-inpu t
A redundant power su pply can be iden tified and diagno sed by a runn ing system regardles s o f its in put
status. The AC-inpu t and DC-input supp lies are interchan geable.
status. The AC-inpu t and DC-input supp lies are interchan geable.
Power Management Modes
The Catalys t 49 00M switch suppo rts the redundant power management mod e. In this mode, if both
p ower supplies are o peratin g normally, each provides fro m 2 0/80 to 45/55 percent of the total system
p ower requirements at all times. If on e power supply fails, the other unit increases p ower to 100 percent
o f the total power req uiremen t.
p ower supplies are o peratin g normally, each provides fro m 2 0/80 to 45/55 percent of the total system
p ower requirements at all times. If on e power supply fails, the other unit increases p ower to 100 percent
o f the total power req uiremen t.
Catalyst 4900M Half-Card Modules
The Catalyst 490 0M switch chassis h as two half-card slots available allowing two half-card modu les to
b e installed . The fo llowing half-card mo dules are available:
b e installed . The fo llowing half-card mo dules are available:
•
•
•
•
The half-card modules can be mixed in a chassis.