Chapter 6: Replacing field-replaceable items
Removing a power supply module
Perform these steps to remove a power supply module.
1. Detach all the node lid bolts with the torque wrench and open the lid to expose the module and power
slots. See Opening the Ripple-2 node at the beginning of this chapter.
2. Loosen the four mounting screws.
3. Grasp the power supply by its handle and carefully lift its top edge to remove it from the connectors on
the lid motherboard.
4. Pull the module toward the node's base, away from the fiber channel.
5. When the power supply is clear of the fiber channel, lift it upward and away from the node lid
motherboard.
Installing a power supply module
One or two power supply modules can be installed in the Ripple-2 node lid. When only one RPD module
is installed, the power supply is installed next to the module installed in slot 1.
1. Detach all the node lid bolts with the torque wrench and open the lid to expose the module and power
slots. See Opening the Ripple-2 node at the beginning of this chapter.
2. Grasp the power supply by its handle, carefully insert its bottom edge (facing exterior edge of the lid)
under the fiber channel and align the power supply module connectors with its mate connectors on the
lid motherboard.
3. Firmly push the module down into the motherboard connector.
4. Secure the power supply module with the four mounting screws using a medium flat-blade
screwdriver.
5. Close the node housing, strictly adhering to the Closing the Ripple-2 Node housing procedure.
Related information
Closing the Ripple-2 Node housing
Installing a Buoy Power Backup module
The Buoy Power Backup module is a UPS device that can be installed in a Ripple-2 node.
Overview
In R-PHY systems, one of the main causes of service disruptions is maintenance related to short plant
power interruptions. Most disconnects are caused by the removal or insertion of tap face-plates, as make-
before-break components wear out over time. Other interruptions are due to momentary shorts. For
example, a split-second power interruption typically causes ~1 second RF interruption in legacy analog
HFC, but an R-PHY node will experience several minutes of interruption due to RPD reboot.
A solution to this issue can be provided by the installation of a Buoy Power Backup module. This device
has a similar footprint to the standard power pack and is intended to be used with an existing power pack.
Once installed in an open power supply slot it remains as a maintenance-free, capacitor-based UPS
device that maintains DC voltage to the node’s RPDs during short plant power interruptions while having
a negligible effect on power consumption.
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