In this section:

Overview

SBC 5400 systems configured for DC power can accommodate dual redundant DC power supplies, as shown in figure DC Power Supply.

The DC power supply is a Customer Replaceable Unit (CRU). The product code is SBC-5400-PSUDC.


DC Power Supply

In a dual redundant power supply configuration, the Power Supplies are hot-swappable meaning that a power supply may be replaced without powering down the SBC 5400 platform (provided that one power supply is operational).

 

Important
Before replacing a power supply in a redundant power supply configuration, verify the status of the redundant power supply. The “POK” LED status must be “solid green”. Removing the power supply when the redundant power supply does not show a solid green status, may cause the system to power down. Contact Sonus Customer Support if required.

SBC 5400 DC power supply states

Power Supply ConditionLED States (Green/Amber)
No DC Power to all PSUOFF
DC present/Standby Outputs ON, Main Output OFF Blinking Green
Power supply DC Outputs ON and OKSolid Green
Main Output Failure (OCP, OVP, UVP)Blinking Amber
Fan Fail, OTP, Standby Output OCP/UVPSolid Amber

Parts and Tools Required

  • Electrostatic discharge (ESD) strap
  • Replacement DC supply.
  • A #2 Phillips-head screwdriver
  • Torque driver with #2 Phillips bit
  • Voltmeter

 

The chassis is shipped with one power supply, unless a second power supply is added at the time the order is placed.

To prevent damage from electrostatic discharge, an ESD strap is provided in the accessory kit. Refer to Connecting ESD Wrist Strap to install it.

 

Replacing a Power Supply

Perform the following procedure to replace a power supply:

  1. Attach an Electrostatic Discharge (ESD) wrist strap to the ESD grounding point on the back of the chassis, and place the other end around your wrist (see Connecting Electrostatic Discharge Wrist Strap for details).
  2. Disconnect -48VDC power to the DC power supply being replaced by shutting off circuit breaker or removing fuse on facilities power distribution panel or similar operation.
  3. Verify the POK LED is off on the DC power supply being replaced.
  4. Ensure that power is no longer present on power cables using a voltmeter.

  5. Remove clear plastic protective cover on terminal strip.

    Removing the plastic protective cover

  6. Disconnect RTN and -48V connections by loosening two terminal strip screws using the #2 Philips screwdriver.

    Disconnecting the RTN and -48V connections

  7. Disconnect power supply ground connection by removing the screw securing the green chassis ground wire to the DC power supply using the #2 Philips screwdriver.
  8. Disengage the DC power supply latch by moving the latch to the left.
  9. Pull on the loop handle to slide the DC power supply out of the SBC chassis.
  10. Install the replacement DC power supply into the SBC chassis by sliding it forward until the latch clicks in place.
  11. Reconnect the green power supply ground wire to the DC power supply using the torque driver supply and tighten the screw to 13.9 in/lb.
  12. Reconnect the RTN and -48V cables to the terminal strip screws and tighten to 13.9 in/lb using the torque driver.
  13. Reinstall the clear plastic protective cover on the terminal strip.
  14. Apply power to the DC power supply by turning the circuit breaker or installing the fuse on facilities power distribution panel or similar operation.
  15. Verify that the POK green LED on the newly-replaced power supply is solid green.
  16. From the application, verify that no power supply alarms are generated. 

CRU Storage

All SBC 5400 CRUs are shipped in electrostatic discharge bags and should be handled using appropriate ESD precautions.

The storage environment for these CRUs is:

  • Humidity must be less than 95% (non-condensing)
  • Temperature must be between -40C and +70C.

The ESD Susceptibility symbol warns of the presence of Sonus devices susceptible to electrostatic discharge. Do not handle equipment without wearing a properly grounded ESD wrist strap.

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