United States
Q
What power supply models are available for the Cisco Catalyst 4900 series?
A
The Catalyst 4900 supports two hot-swappable AC modules (PWR-4900-AC-1KW, PWR-4900-AC-2KW) and a DC module (PWR-4900-DC-2KW) for flexible deployment.
Q
How do I install a Catalyst 4900 power supply unit?
A
Slide the hot-swappable module into an empty PSU bay until it clicks, secure the latch, then connect the power cord and verify green LED status.
Q
Can I hot-swap power supplies on the Catalyst 4900 without downtime?
A
Yes. The Catalyst 4900’s hot-swappable design allows safe insertion or removal of AC/DC modules without interrupting switch operation.
Q
What is the maximum power capacity of the Catalyst 4900 AC power supplies?
A
The PWR-4900-AC-2KW provides up to 2000 W of continuous output, supporting full-system loads and high-density optics.
Q
Does the Catalyst 4900 support redundant power supply configurations?
A
Yes. The switch can operate with two identical AC/DC modules in active/standby mode for N+1 redundancy.
Q
How do I verify power supply health on the Catalyst 4900?
A
Check the PSU status LEDs on the front panel; green indicates healthy operation, amber indicates a fault, and no light signals absence of power.
Q
What safety standards do Catalyst 4900 power supplies comply with?
A
All Cisco Catalyst 4900 PSUs are UL, CE, and CSA certified and meet RoHS and WEEE environmental directives.
Q
What operating temperature range is supported by these power supplies?
A
The Catalyst 4900 PSUs operate reliably between 0 °C and 40 °C (32 °F to 104 °F) in normal airflow environments.
Q
How do I replace a failed power supply in my Catalyst 4900?
A
Remove the faulty unit, install a compatible hot-swap module, reconnect power, and confirm LED turns green for normal operation.
Q
Are Catalyst 4900 power supplies backward-compatible with earlier Catalyst chassis?
A
No. PWR-4900 modules are designed specifically for the 4900 series and are not compatible with prior Catalyst platforms.
Q
What is the warranty coverage for Catalyst 4900 power supplies?
A
Cisco provides a limited lifetime warranty for hardware, covering manufacturing defects and offering replacement through Cisco support.
Q
How do I monitor power supply metrics remotely?
A
Use Cisco IOS commands (show environment power) or SNMP OIDs to view real-time voltage, current, and status for each PSU.
Q
What power cord types are supported for the Catalyst 4900?
A
Catalyst 4900 supports standard IEC C13 to C14 power cords for AC modules and customer-provided DC cables per installation guide.
Q
Can I mix AC and DC power supplies in the same Catalyst 4900 chassis?
A
No. The chassis requires identical PSU types; all installed modules must be either AC or DC to ensure proper load balancing.
Q
How efficient are the Catalyst 4900 power supplies?
A
The PWR-4900-AC modules exceed 85% efficiency at typical loads, reducing energy costs and supporting high-density operations.
Q
What are the recommended airflow requirements for the Catalyst 4900 PSUs?
A
Ensure uninterrupted front-to-rear airflow with a minimum clearance of 2 inches above and below the chassis for optimal cooling.
