- Contents
- Prerequisites for Configuring the PVDM3 Module on Cisco Voice Gateway Routers
- Restrictions for Configuring the PVDM3 Module on Cisco Voice Gateway Routers
- Information About Configuring the PVDM3 Module on Cisco Voice Gateway Routers
Configuring Next-Generation High-Density PVDM3 Modules
The next-generation Pack Voice Digital Signal Processor Modules (PVDM3) digital signal processor (DSP) modules provide up to four times the density (per slot) of existing audio applications on Cisco voice gateway routers. One universal DSP image for these DSP modules provides resources for time-division multiplexing-to-Internet Protocol (TDM-to-IP) gateway functionality for digital and analog interfaces, audio transcoding, and audio conferencing.
This enhanced DSP architecture accommodates a new packet-processing engine for rich-media voice applications and supports the TDM voice framework used by the PVDM3 module. The PVDM3 has a Gigabit Ethernet interface with a MultiGigabit Fabric to increase IP throughput, and a DSP hardware-based health monitor provides DSP failure detection that is ten times faster than existing technology.
The DSP Resource Manager has been enhanced so that PVDM3 modules can pool DSP resources and share DSP resources across voice service modules.

Warning You can configure Next-Generation High-Density PVDM3 Modules only on Cisco VG310 and Cisco VG320 platforms.
Contents
- Prerequisites for Configuring the PVDM3 Module on Cisco Voice Gateway Routers
- Restrictions for Configuring the PVDM3 Module on Cisco Voice Gateway Routers
- Information About Configuring the PVDM3 Module on Cisco Voice Gateway Routers
- How to Verify and Troubleshoot the Functionality of the PVDM3 Cards on Cisco Voice Gateways
- Configuration Examples for Configuring the PVDM3 Module on Cisco Voice Gateway Routers
- Additional References
Prerequisites for Configuring the PVDM3 Module on Cisco Voice Gateway Routers
To configure the PVDM3 Module on your Cisco VG310 or Cisco VG320 series voice gateway router, you must have Cisco IOS Release 15.4(3)M or a later release installed. The image must provide a voice-capable feature set.
If you have installed the PVDM3 cards in your Cisco gateway, make certain that you have complied with the hardware installation instructions in Cisco VG310 and Cisco VG320 Voice Gateways Hardware Installation Guide.
Restrictions for Configuring the PVDM3 Module on Cisco Voice Gateway Routers
The PVDM3 card can be installed and used on the Cisco VG310 or Cisco VG320 voice gateway routers.
All codecs that are supported on the PVDM2 are supported on the PVDM3, except that the PVDM3 does not support the G.723 (G.723.1 and G.723.1A) codecs. The PVDM2 can be used to provide G.723 codec support or the G.729 codec can be as an alternative on the PVDM3.
Information About Configuring the PVDM3 Module on Cisco Voice Gateway Routers
To take full advantage of the PVDM3 cards on Cisco voice gateway routers, you should understand the following concepts:
- DSP Resource Manager Enhancement and DSP Numbering
- DSP Image for the PVDM3
- Broadcast Fast Busy Tone for DSP Oversubscription
- Broadcast Fast Busy Tone for DSP Oversubscription
DSP Resource Manager Enhancement and DSP Numbering
Each PVDM3 DSP card can hold up to two devices, and each device can hold up to three DSP cores. The host recognizes each DSP card as one individual DSP and each physical DSP as a device. This virtual DSP concept provides a maximum of six DSPs per PVDM3. For backward compatibility for 5510 DSPs, the existing numbering scheme is maintained (see Table 4-1 ), and for PVDM3 DSPs, a new numbering scheme is applied (see Table 4-1 ).

Note The numbering schemes shown in Table 4-1 are examples only, and the DSP cards must be installed in the PVDM slots as shown for these sample numbering schemes to be correct. For more information about DSP and device numbering, see the documents listed in the “Additional References” section.
|
|
---|---|
|
|
DSP Image for the PVDM3
The DSP image for the PVDM3 supports all features supported on PVDM2 except Cisco Fax Relay. The DSP image provides feature capability to implement the signal processing layer for a TDM-to-IP gateway:
- TDM-to-IP gateway for voice telephony, including support for multicast conferencing through the mixing of multiple IP streams out a single TDM port.
- Low-level processing of CAS from a T1/E1 interface through the use of digital signaling channels.
- Control and low-level processing of the signaling for analog telephony interface implemented on Cisco’s voice interface card (VIC) hardware.
- Support for Voice Band Data (VBD) through the use of upspeeding channels.
- Support of facsimile using T.38 Fax Relay technology.
- Support of high-speed modems (V.32 and V.34) using Modem Relay technology.
- Interface with Secure Telephony (STU) phones using Secure Telephony over IP standard technology.
- Support for interfacing VoIP channel to Land Mobile Radio (LMR) networks.
- Support for secure VoIP through the implementation of SRTP for both encryption and authentication of RTP packets.
- Support for text telephony (Baudot) using Text Relay technology.
The DSP image for the PVDM3 also provides a complete set of features to implement the signal processing layer of an IP-to-IP gateway and an IP-based conference server. Highlights of this functionality include:
- G.711 transcoding for implementing a LAN-WAN gateway.
- Universal Transcoding between any two voice codecs (narrowband or wideband).
- Trans-scripting services for conversion between SRTP configurations or between secured and unsecured networks.
- IP-based voice conferencing, including narrowband and wideband participants.

Note Transcoding, LMR and Conferencing features are not supported on Cisco VG310 and Cisco VG320 Voice Gateways.
Broadcast Fast Busy Tone for DSP Oversubscription
There should always be a dial tone when a telephone is lifted. However, when DSP oversubscription occurs, and a caller goes off-hook, dead-air is received. With this feature, the caller receives a fast-busy tone instead of silence. This feature is not supported on application-controlled endpoints, Foreign Exchange Office (FXO) signaling endpoints, and BRI and Primary Rate Interface (PRI) endpoints.
The following lists the maximum number of different fast busy tone (specific to country) that can be supported by each PVDM type:
Prior to Cisco IOS Release 15.4(3)M, a new call attempt failed and dead silence occurred when DSPs were oversubscribed. When the PVDM3 is installed, a fast busy tone is broadcast to session application endpoints when DSP over-subscription occurs for both analog ports and digital ports, except PRI and BRI. FXO signaling and application controlled endpoints are not supported. This feature does not apply to insufficient DSP credits due to mid-call codec changes (while a call is already established).
Online Insertion and Removal
Cisco VG350 support only managed online insertion and removal. All voice ports and controllers should be shut down. Transcoding, conferencing, and MTP DSPfarm profiles need to be shut down in addition to the controller and voice port shutdown. Also, remove the DSP sharing (that is, DS0-group and DSPfarm sharing).
If the power efficiency management is configured on the module, the EnergyWise level must be set to 10 or online insertion and removal is not allowed.
Perform the following tasks for managed online insertion and removal on the Cisco VG350:
1. Shut down the controller and voice ports.
2. Perform online insertion and removal.
3. Restart the controller and voice ports.
Shut down the controller and voice ports
Perform the steps detailed in this section to shut down the controller and voice ports
SUMMARY STEPS
DETAILED STEPS
|
|
|
---|---|---|
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
Perform online insertion and removal

Note This feature is available only on Cisco VG350.
SUMMARY STEPS
2. Confirm that the board is ready for removal.The LED blinks for 3 seconds and turns off. After the LED is off, the board is ready for removal.
3. Insert the replacement board in the same slot or in an empty slot.
DETAILED STEPS
SUMMARY STEPS
DETAILED STEPS
|
|
|
---|---|---|
|
||
|
||
|
||
|
||
|
||
|
||
|
How to Verify and Troubleshoot the Functionality of the PVDM3 Cards on Cisco Voice Gateways
Use the following commands in global configuration mode to verify and troubleshoot the functionality of the PVDM3 modules in your Cisco voice gateway.
1. show platform hw-module-power
1. show voice call slot / port
4. show voice dsp capabilities slot number dsp number
5. show voice dsp group slot number
6. show voice dsp statistics device
7. show voice dsp statistics tx-rx
8. show voice dsp statistics ack
Step 1 show platform hw-module-power

Note Only on Cisco VG350, effective from Cisco IOS Releases 15.1(1)T and 15.0.1M(2), the hw-module energywise level command is not available in Cisco IOS software. For more information, see the Cisco 3900 Series, 2900 Series, and 1900 Series Software Configuration Guide.
Use this command to display power settings of PVDM3 service modules, for example:
Step 2 show voice call slot / port

Note If you are connected using a Telnet session, you must enter the terminal monitor command before the show voice call command to see console messages. This step is not necessary if you are connected to the console port.
Use this command to display statistics for voice calls on a specific slot and port, for example:
Step 3 show voice dsp group all
Use this command to display information for each DSP group, for example:
Step 4 show voice dsp sorted-list
Use this command to display the hunt order in which DSPs are utilized for particular services (in this example, voice, conferencing, and transcoding are shown for slot 0):
Step 5 show voice dsp capabilities slot number dsp number
Use this command to display capabilities data for a particular DSP on a particular slot (in this example, DSP 2 on slot 0):
Step 6 show voice dsp group slot number
Use this command to display the current status or selective statistics of DSP voice channels for a specific DSP group. For example:
Step 7 show voice dsp statistics device
Use this command to display DSP voice statistics for the device:
Step 8 show voice dsp statistics tx-rx
Use this command to display transmitted and received packet counts for the device:
Step 9 show voice dsp statistics ack
Use this command to display ACK statistics for the device:
Step 10 debug voice dsp crash-dump
Use this command to display debugging information for the crash dump feature (for detailed information about this, see the section Voice DSP Crash Dump File Analysis in Cisco IOS Voice Troubleshooting and Monitoring Guide):
Configuration Examples for Configuring the PVDM3 Module on Cisco Voice Gateway Routers
This section provides an example of a running configuration. This example is for reference purposes only and contains IP addresses and telephone numbers that are not actual, valid addresses and telephone numbers; they are provided for illustrative purposes only.
show running-config: Example
Additional References
The following sections provide references related to the PVDM3 on Cisco Gateway Routers feature.
Related Documents
|
|
---|---|
Comprehensive command reference information for Cisco IOS voice commands. |
|
Configuration information for Cisco Voice Gateway Routers that are configured for Cisco Unified Communications Manager. |
Cisco Unified Communications Manager and Cisco IOS Interoperability Guide |
Complete hardware installation instructions for installing the PVDM3. |
Cisco 2900 Series and 3900 Series Integrated Services Routers Hardware Installation Guide |
Standards
|
|
---|---|
MIBs
|
|
---|---|
To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at: |
RFCs
|
|
---|---|
Technical Assistance
Feature Information for Configuring the PVDM3 Module on Cisco Voice Gateway Routers
Table 4-2 lists the release history for this feature.
Not all commands may be available in your Cisco IOS software release. For release information about a specific command, see the command reference documentation.
Use Cisco Feature Navigator to find information about platform support and software image support. Cisco Feature Navigator enables you to determine which Cisco IOS and Catalyst OS software images support a specific software release, feature set, or platform. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account at Cisco.com is not required.

Note Table 4-2 lists only the Cisco IOS software release that introduced support for a given feature in a given Cisco IOS software release train. Unless noted otherwise, subsequent releases of that Cisco IOS software release train also support that feature.
|
|
|
---|---|---|
The PVDM3 DSP1 modules support high-density audio applications on the Cisco voice gateways. These DSP modules provide resources for voice termination, voice compression algorithms, echo cancellation, conferencing and transcoding, and support for modems and fax calls. In Release 15.4(3)M, this feature is supported only on the Cisco VG310 and Cisco VG320. |
|