1. Hardware Installation and Maintenance Guide
  2. Maintenance
  3. Maintenance Without Power

Maintenance Without Power

Some maintenance tasks must be performed after powering down the system.

  • Remove and replace the front bezel
  • Remove the chassis from an equipment rack
  • Remove the chassis cover
  • Remove and replace transcoder DSP modules
  • Remove and replace T1/E1 TDM modules
  • Replace the main board (motherboard)

Remove and Replace the Front Bezel

The bezel is attached magnetically.
  1. To remove the bezel, pull on its left corner.
  2. To replace the bezel, hook the right to its slots and press the left side forward until the magnet catches.

Removing the Unit from an Equipment Rack

  1. Power down the unit gracefully using the ACLI commands.
  2. Depress the power pushbutton.
  3. Remove the two power cords from the power supplies in the rear of the system.
  4. Remove and label all attached network cables and console cable from their respective ports on the chassis.
  5. Loosen the thumbscrews that secure the Acme Packet 4900 to the equipment rack slide rails.
  6. Slide the unit forward.
    removing unit

    When mounted in slide rails, the chassis will stop when the locking clip pin on the chassis slide rail engages with the equipment rack slide rail.

  7. Push the locking clip latches on both sides of the chassis inwards to unlock the slide rails from each other.
    locking latch
  8. Pull the the Acme Packet 4900 chassis completely from the slide rails.
  9. Pull the unit with the slide rails still attached out of the equipment rack, and move it to an ESD-safe location.

    Note:

    One person should support the Acme Packet 4900 from below while the other person removes the chassis from the equipment rack.

Remove the Chassis Cover

Caution:

Always gracefully power down the Acme Packet 4900 and then disconnect the power supplies from the power source when removing the chassis cover.
  1. Remove Acme Packet 4900 from the rack.
  2. Push the chassis cover backwards about ½ inch.
  3. Lift the cover up until it is free of the chassis.

Replacing Transcoder Modules

Up to 8 transcoder modules may be installed on the Acme Packet 4900 printed circuit board (PCB).

Image showing transcoding DSP modules

The Acme Packet 4900 PCB includes slots for installing the transcoder TCM modules. The slots are numbered 0-7. Slot 0 is in the bottom row and closest to the edge of the unit when looking at it from the front of the chassis. Transcoder TCM modules should be installed consecutively in numerical order, starting with slot 0.

4900 board

Guidelines

Please read and follow these guidelines prior to installing or removing the transcoder DSP module:
  • The transcoder module can be installed only in the designated location.
  • Ground yourself and follow proper ESD grounding procedures.
  • Remove the transcoder module from the shipped packaging.
  • The installation of these modules should be performed during low-traffic periods or during times of scheduled maintenance.
  • Follow industry-standard procedures to ensure ESD protection.
  • When installing or removing a TCM module, move the card to an ESD-safe location.

Note:

Before handling any components, follow the proper ESD grounding procedures. Failure to do so could damage the card and its components.

Required Parts

The following parts are required to replace the transcoder DSP module.
  • ESD wrist strap
  • ESD-safe location
  • Transcoder TCM module

Removing the Transcoder Module

The following procedure describes how to remove the transcoder module.
Prerequisites:
  • Provide an ESD-safe location to place the transcoder module.
  • Wear an ESD wrist strap.
  • Remove the chassis cover.
  1. Use a fingertip to release the catch holding either end of the transcoder module.
    AP4900 Transcoder Module
  2. Once the fasteners are detached from both sides of the transcoder module, hold the center of the module between your finger and thumb and slowly remove the module.

    Be careful to keep the module level while removing it and guide it smoothly through the guide slots on either side.

    Image Showing Removing the Transcoder Module
  3. Place the transcoder module on an ESD-safe antistatic surface.

Installing the Transcoder Module

The following procedure describes how to install the transcoder module onto the PCB.
Prerequisites:
  • Place the new transcoder module in an ESD-safe location.
  • Wear an ESD wrist strap.
  1. Grasp the transcoder module between your thumb and index finger and line up both sides of the module with the slot guides attached to the PCB.
    Image showing Installing the Transcoder Module
  2. Using your thumb on your other hand, guide the module evenly into the slot guides located on each side as you lower the component into the connector. Press evenly across the top of the connector to fully seat the transcoder module on the PCB.

    The module is fastened to the connector at one end while at the other end, the board rests on two standoffs attached to the PCB.

    Image showing Installed Transcoding Module

Removing and Replacing the T1/E1 Module

The T1/E1 module (A) is located near the rear of the board. It plugs into the rear panel as well as a raised PCI Express connector (B).

Location of TDM module

Location of T1/E1 ports

Guidelines

Read and follow these guidelines prior to installing or removing the TDM module:
  • Ground yourself and follow proper ESD grounding procedures.
  • Remove the transcoder TDM module from the shipped packaging.

Note:

In the box with the new T1/E1 TDM modules, there will be aTelecom label in a plastic envelope. Attach the Telecom label to the chassis cover as described below.

Note:

The installation of these modules should be performed during low-traffic periods or during times of scheduled maintenance.

Caution:

Before handling any components, follow the proper ESD grounding procedures. Failure to do so could damage the card and its components.

Required Parts

The following parts are required to replace the transcoder DSP module.
  • ESD wrist strap
  • ESD-safe location
  • New or replacement TDM module
  • Telecom label to attach to the chassis cover

Required BIOS and Software Upgrade

Before replacing a Digium TDM card with a Sangoma TDM card, you must:
  1. RMA the device to Oracle.
  2. Upgrade to a software patch that supports the new card.
    The following releases and newer support the Sangoma TDM card:
    • 9.2p1
    • 9.1p7

Remove the TDM Module

  1. Remove the Acme Packet 3950 cover.

    The T1/E1 TDM module is installed into the rear panel of the chassis and attached through a PCI Express x4 connector. The module is raised about a quarter of an inch off of the chassis PCB.

    Note:

    Your TDM card may vary from that in the picture.
    Disconnect the TDM module

    Part of the module is a piece of metal connected at 90 degrees to the module PCB. This piece contains the four T1/E1 ports visible when looking at the rear panel of the chassis. The metal extends on either side of the port area. When looking from the inside of the chassis, the part of the metal to the left of the ports continues straight and is attached to the inside of the rear panel. To the right of the ports, the metal bends 90 degrees towards the rear of the chassis, and is inserted through the rear panel.

  2. Remove the screw on the outside of the chassis that holds the module seated against the rear panel of the chassis.
  3. Grasp the module by its edges. Pull the right side of the module out of the rear panel slot, and, at the same time, slide the left side of the piece of metal from the rear panel.
  4. Pull the module laterally out of the plug and away from the rear panel of the chassis. You may have to work the module back and forth as you pull, in order to disengage the module from the two directions.

    Note that there is a gap in the edge connector of the module PCB. There are metal bands on either side of the gap. The left-most part of the connector section is outside of the plug.

  5. When the module is fully disengaged, remove it from the chassis area to an ESD-safe location.

Install the TDM Module

  1. Grasp the module by its edges. Orient it towards the plug and the rear panel of the chassis as you found the original module.
  2. Push the right side of the module into the chassis rear panel slot, and, at the same time, slide the left side of the piece of metal into the rear panel.
  3. Push the module laterally into the plug and toward the rear panel of the chassis. You may have to work the module back and forth as you pull, in order to secure the module from the two directions.

    Note that there is a gap in the edge connector of the module PCB. There are metal bands on either side of the gap. The left-most part of the connector section is outside of the plug.

  4. Attach the screw that secures the piece of metal attached to the module to the rear panel.
  5. After you finish installing the module, replace the cover of the unit.
  6. If this is not a replacement T1/E1 card, affix the Telecom label to the top cover.
New Sangoma TDM card

If you returned your device to Oracle to replace a Digium TDM card with a Sangoma TDM card, the new port numbers are reversed. So port number 1 on the Digium card is now port 4 on the Sangoma card. Use show tdm spans to view the span information.

Table 5-1 Port Numbers

Digium port number Sangoma port number
1 4
2 3
3 2
4 1

Remove and Replace the Main Board

Use this procedure to remove and replace the main board.

Remove the Main Board

  1. Remove the front bezel and air filter.
  2. Remove both fan modules.
  3. Remove both power supplies.
  4. Remove the top cover.
  5. Remove the following optional components if they are included with your system:
    • Transcoding modules
    • TDM card (AP3950 only)
  6. Unplug the front panel cable connection.
  7. Unplug the front panel cable connection.
    1. Gently pull up on the top ring of the connector.
    2. Using the pull tab on the cable, pull the cable out of the connector.
      front panel cable connection
  8. Remove the clear plastic air diverter.
    1. Gently pull the air diverter straight up approximately ¼ of an inch.
    2. Slide the air diverter towards the rear of the system to remove the plastic tabs from their slots.
    3. Lift the air diverter out of the system
      air diverter
  9. Remove the rear panel.
    1. Loose the three captive screws.
    2. Pull the panel straight back to disengage it from around the connectors.
      rear panel
  10. Remove the main board.
    1. Grab hold of the 2 green rings on the main board.
    2. Slide the main board toward the rear until it stops.
    3. Gently lift the main board out of the system.

Replace the Main Board

  1. Install the new main board.
    1. Grab the main board by the 2 green rings.
    2. Place the main board on to the system floor.
      Make sure the board engages with all the buttons on the bottom. Also make sure the font panel cable is not trapped under the main board.
    3. Slide the main board toward the front of the system until it stops.
      install main board
  2. Reinstall the rear panel.
    1. Place the rear panel so that the connectors pass through the openings.
    2. Press into the chassis until the panel sits against the chassis.
    3. Tighten the 3 captive screws.
      rear panel screws
  3. Reinstall the clear plastic air diverter.
    1. Guide the front hook tabs into the rectangular slots in the chassis.
    2. Lower the air diverter onto the main board, making sure the small pins go into the holes in the main board.
      air diverter
  4. Plug the front panel cable back into the main board.
    front panel cable
  5. Reinstall the following optional components if included in your system:
    • TDM card (3950 only)
    • Transcoding modules
  6. Reinstall the top cover.
  7. Reinstall the power supplies.
  8. Reinstall the fan modules.
  9. Reinstall the front bezel.