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CHAPTER 6: POWER SUPPLIES
The switch ships with two AC power supplies. The power supplies have two air-flow directions, normal and reverse. Normal is from
the I/O-side to the PSU-side. Reverse is from the PSU-side to the I/O-side.
Two PSUs are required for full redundancy, but the system 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 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: ESD damage can occur if components are mishandled. Always wear an ESD-preventive wrist or heel ground strap when
handling the EMS100G-32 and its components.
6.1 COMPONENTS
The following power supply is available for the EMS100G-32 switch:
AC power supply with integrated fan
Power supply 1 (PSU1) is on the left side of the chassis; power supply 2 (PSU2) is on the right side of the chassis.
FIGURE 6-1. EMS100G-32 SWITCH PSUS
PSU 1 and 2
The PSUs have an integrated fan that you cannot replace individually. If the fan integrated in a PSU fails, you must replace the entire
PSU. You can replace the fan trays individually. For fan tray replacement procedures, see Fans.
WARNING: Prevent exposure and contact with hazardous voltages. Do not attempt to operate this switch with the safety cover
removed.
CAUTION: Remove the power cable from the PSU prior to removing the PSU. Also, do not connect the power cable before you insert
the PSU in the chassis.
NOTE: To comply with the GR-1089 Lightning Criteria for Equipment Interfacing with AC Power Ports, use an external surge
protection device (SPD) at the AC input of the router.
