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DSP20 modules are considered hot-swappable. They may be removed and replaced without powering down the node. For example, inserting a DSP25, module which is administratively enabled results in the module booting up as normal without user further intervention The

Spacevars
0 product

with the failed DSP20 module reboots, detects the DSP20 module failure during startup and returns to service with the DSP20 module disabled. Appropriate alarms are raised and automatically cleared by the system. The current node continues to deliver service (if Active SBC) or provide protection (if Standby SBC).

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Note

Only one DSP20 is allowed in  Spacevars 0 model5 chassis, and it must reside in slot 1. Mixing DSP20 and DSP25 modules (both within a chassis and between Active/Standby servers) is not supported. For example, if SBC-A contains DSP25 has a DSP20 in slot 1-3, SBC-B should also have a DSP25 in slots 1-3. As another example, if SBC-A has a DSP20 in slot 1, SBC-B should not have anything not have anything other than a DSP20 in slot 1.

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• Electrostatic discharge strap
• Replacement DSP20 module
• A #2 Phillips-head screwdriver.

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

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Inserting/Removing the DSP20 Module

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1. Attach an Electrostatic Discharge wrist strap using the ESD grounding point on the front panel of the chassis (see Connecting ESD Wrist Strap for details).

2. Loosen the screws securing the DSP20 module (or slot 1 cover) at the rear of the

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   0 model5

   chassis.

   Caption
   0 Figure 1 SBC 5400 Chassis Rear

3. Remove the DSP20 module (or remove slot cover) from slot 1 of the chassis and place it into the ESD protective bag.
4. Insert/replace the DSP20 module in slot 1. If you are replacing a DSP20 with a DSP25 module, see SBC 5400 DSP25 Module document for DSP25 installation instructionsmodule in slot 1.
5. Tighten the two captive fasteners to 10 in/lbs.
6. Enable the DSP Software.
7. Run SBC HW Diags and observe results after the installation is completed.

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Caption
0 Figure 1 EMA Daughter Board Admin Enable Enabled Screen
Image Added

Disabling the DSP Software

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Info
title Failure Scenario
An SBC node experiences a hardware failure which triggers the functioning node to remain (or become) the primary SBC. The SBC with the failed DSP20 module reboots, detects the DSP25 DSP20 module failure during startup and returns to service with the DSP20 module disabled. Multiple reboot attempts may occur before the module is declared as failed. The module is disabled via hardware primitives (such as slot power-down or hold in reset) to ensure that a misbehaving board cannot interfere with system operation. When establishing HA connectivity, the primary SBC discovers that the secondary has less DSP capacity. The primary SBC automatically triggers a graceful dry-up in an attempt to align DSP hardware capabilities. During the dry-up period, active calls on the "extra" DSP module are not protected in the event that a switchover occurs before dry-up completes. Once the dry-up completes, the primary SBC no longer uses the "extra" DSP module. The pair is now redundant with reduced capacity.

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The procedures below describe removing DSP20 modules from an in-service 

Spacevars
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HA pair to decrease the DSP capacity. In these procedures, "SBC-A" represents the currently active SBC and "SBC-B" the current standby.

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1. Remove the DSP20 module from slot 1 on SBC-B. This triggers a node reboot.
2. SBC-B returns to service.
3. While re-establishing HA connectivity, SBC-A discovers that SBC-B has less is without any DSP capacity as only one DSP20 is allowed in the system.
4. SBC-A automatically triggers a graceful dry-up in an attempt to align DSP hardware capabilities.
   1. During the dry-up period, active calls on the "extra" DSP20 module are not protected in the event that a switchover occurs before dry-up completes (that is, partial redundancy).
5. Once the dry-up completes, the SBC-A no longer uses the "extra" DSP module.
6. Disable SBC-A's "extra" DSP20 module.
7. Remove the disabled DSP20.

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Warning
Calls using DSPs on the primary SBC corresponding to the disabled slot on the secondary are not protected during a switchover (that is, partial redundancy). Loss of active calls can be avoided by performing a dry-up prior to module removal.

1. Remove the DSP25 DSP20 module from the highest numbered slot on SBC-B. This triggers a node reboot.
2. SBC-B returns to service.
3. When re-establishing HA connectivity, SBC-A discovers that SBC-B has less is without any DSP capacity as only one DSP20 is allowed in the system.
4. SBC-A continues to use all available DSP capacity, as needed.
5. Perform a graceful dry-up on SBC-A for the DSP25 DSP20 module to remove.
6. Remove the "extra" DSP25 DSP20 module from SBC-A which triggers a reboot and switchover.
7. SBC-B returns to service.
8. Full redundancy is now in effect.

Field Programmable Gate Array

The DSP2x DSP20 module includes a Field-Programmable Gate Array (FPGA) that may occasionally require reprogramming. The reprogramming is fully autonomous and occurs during system reboot process. The only noticeable effect to the system is a slight increase to the duration of the system reboot. For each DSP2x DSP20 installed, expect an additional 1-2 minutes added to the length of a normal reboot process.

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1. No upgrade is needed for a slot

   Code Block
   language none
   updateAll:: key: 1, value: DSP25. NO ACTION REQUIRED FOR SLOT 1. version 2013/03/20 18:03:52, minVersionRequired 2013/03/20 18:03:52

2. Upgrade is needed for a slot:

   Code Block
   language none
   updateAll:: Require update for slot 1 version :: 2013/03/20 18:03:52 and minVersionRequired 2013/03/20 18:03:53 upgradeFpgaForSlot Upgrading FPGA for Slot 1 Loading DSP2XDSP20 FPGA File to memory [rr_dsp_mux3_routed.rom]...Complete Design Name: rr_dsp_mux3_routed.ncd;HW_TIMEOUT=FALSE;UserID=0xFFFFFFFF Device Name: 6vlx75tff484 Version: 2013/03/20 18:03:52 Image Length: 0x00320c2c Erasing DSP2xDSP20 SPI Flash [SLOT 1]... Complete Programming DSP2xDSP20 SPI Flash [SLOT 1]... Complete

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