Question 1

What power supply models are available for the Cisco Catalyst 4900 series?

Accepted Answer

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.

Question 2

How do I install a Catalyst 4900 power supply unit?

Accepted Answer

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.

Question 3

Can I hot-swap power supplies on the Catalyst 4900 without downtime?

Accepted Answer

Yes. The Catalyst 4900’s hot-swappable design allows safe insertion or removal of AC/DC modules without interrupting switch operation.

Question 4

What is the maximum power capacity of the Catalyst 4900 AC power supplies?

Accepted Answer

The PWR-4900-AC-2KW provides up to 2000 W of continuous output, supporting full-system loads and high-density optics.

Question 5

Does the Catalyst 4900 support redundant power supply configurations?

Accepted Answer

Yes. The switch can operate with two identical AC/DC modules in active/standby mode for N+1 redundancy.

Question 6

How do I verify power supply health on the Catalyst 4900?

Accepted Answer

Check the PSU status LEDs on the front panel; green indicates healthy operation, amber indicates a fault, and no light signals absence of power.

Question 7

What safety standards do Catalyst 4900 power supplies comply with?

Accepted Answer

All Cisco Catalyst 4900 PSUs are UL, CE, and CSA certified and meet RoHS and WEEE environmental directives.

Question 8

What operating temperature range is supported by these power supplies?

Accepted Answer

The Catalyst 4900 PSUs operate reliably between 0 °C and 40 °C (32 °F to 104 °F) in normal airflow environments.

Question 9

How do I replace a failed power supply in my Catalyst 4900?

Accepted Answer

Remove the faulty unit, install a compatible hot-swap module, reconnect power, and confirm LED turns green for normal operation.

Question 10

Are Catalyst 4900 power supplies backward-compatible with earlier Catalyst chassis?

Accepted Answer

No. PWR-4900 modules are designed specifically for the 4900 series and are not compatible with prior Catalyst platforms.

Question 11

What is the warranty coverage for Catalyst 4900 power supplies?

Accepted Answer

Cisco provides a limited lifetime warranty for hardware, covering manufacturing defects and offering replacement through Cisco support.

Question 12

How do I monitor power supply metrics remotely?

Accepted Answer

Use Cisco IOS commands (show environment power) or SNMP OIDs to view real-time voltage, current, and status for each PSU.

Question 13

What power cord types are supported for the Catalyst 4900?

Accepted Answer

Catalyst 4900 supports standard IEC C13 to C14 power cords for AC modules and customer-provided DC cables per installation guide.

Question 14

Can I mix AC and DC power supplies in the same Catalyst 4900 chassis?

Accepted Answer

No. The chassis requires identical PSU types; all installed modules must be either AC or DC to ensure proper load balancing.

Question 15

How efficient are the Catalyst 4900 power supplies?

Accepted Answer

The PWR-4900-AC modules exceed 85% efficiency at typical loads, reducing energy costs and supporting high-density operations.

Question 16

What are the recommended airflow requirements for the Catalyst 4900 PSUs?

Accepted Answer

Ensure uninterrupted front-to-rear airflow with a minimum clearance of 2 inches above and below the chassis for optimal cooling.

Catalyst 4900 Power Supplies

PWR-C49M-1000AC/2 (Cisco 4900M Switch PWR-C49M-1000AC/2)

PWR-C49M-1000AC (4900M AC POWER SUPPLY 1000WATTS)

PWR-C49M-1000DC/2 (Cisco 4900M Switch PWR-C49M-1000DC/2)

PWR-C49M-1000DC (Cisco 4900M Switch PWR-C49M-1000DC)

PWR-C49E-300AC-F/2 (Catalyst 4948E switch PWR-C49E-300AC-F/2)

PWR-C49E-300AC-F (Catalyst 4948E switch PWR-C49E-300AC-F)

PWR-C49E-300AC-R/2 (Catalyst 4948E switch PWR-C49E-300AC-R/2)

PWR-C49E-300AC-R= (CATALYST 4948E 300WAC POWER SUPPLY)

Questions & Answers