Install Guide

Power supplies

The S4200-ON Series (S4248FB-ON and S4248FBL-ON) switch ships with two AC or DC power supplies.

The S4200-ON Series switch supports AC or DC power supplies with two air-flow directions, normal and reverse. Normal is from

the I/O to the PSU side. Reverse is from the PSU side to the I/O side. Two PSUs are required for full redundancy, but the

switch can operate with a single PSU.

The PSUs are field replaceable. When running with full redundancy—two power supplies installed and running, you can remove

and replace one PSU without disrupting traffic.

CAUTION: To prevent electrical shock, ensure that the S4200-ON Series switch is grounded properly. If you do

not ground your equipment correctly, excessive emissions may result. Use a qualified electrician to ensure that

the power cables meet your local electrical requirements.

NOTE: Connect the power supply to the appropriate branch circuit protection as defined by your local electrical codes and

verify that the remote power source complies with the switch input power specifications.

NOTE: If you use a single PSU, install a blank plate in the other PSU slot. Use power supply 2 (PSU2) as the blank plate

slot. To install the blank plate, use a #1 Philips screw driver.

NOTE: ESD damage can occur if components are mishandled. Always wear an ESD-preventive wrist or heel ground strap

when handling the S4200-ON Series switch and its components.

Topics:

• Components

• AC or DC power supply installation

• Connect DC power supply to power source

Components

The following power supply options are available for the S4200-ON Series (S4248FB-ON and S4248FBL-ON) switch:

● AC or DC power supply with integrated fan

● AC or DC power supply with integrated reverse flow fan

Power supply 1 (PSU1) is on the left side of the switch; power supply 2 (PSU2) is on the right side of the switch.

Figure 16. S4200-ON Series PSUs

1. PSUs

The PSUs have an integrated fan, which you cannot replace individually; if the fans integrated in a PSU fail, you must replace

the entire PSU. However, you can replace the fan trays individually. For fan tray replacement procedures, see Fans.

30 Power supplies