Hi Vicky,
The new G2 ISR's are a little different in their PVDM3/DSP support. Maybe these notes might help
All the Unified Communications Bundles on Cisco 2900 and 3900 Series routers include the new Cisco® High-
Density Packet Voice Digital Signal Processor (DSP) Module (PVDM3), which has been optimized for concurrent
voice and video support. The PVDM3 modules support all voice-gateway functions of earlier generations of PVDMs,
and add higher density and more processing power to support emerging rich-media applications.
CISCO2951-V/K9 Cisco 2951 Voice Bundle, PVDM3-32, UC License PAK CON-SNT-2951V
In order to integrate an existing Network Modules (NM, NME) or Extended Voice Modules (EVM) into the Services Module (SM) slot on the Generation 2 ISRs, a network module adapter is required. Similarly, to insert an existing Packet Voice Digital Modules (PVDM2) into the PVDM3 slot of the Cisco 2900 and 3900 Series routers, a PVDM adapter is needed. One adapter is needed for each module that needs to be plugged in and can be ordered during system configuration in the Configuration Tool. These adapters can also be ordered as spares in order to insert any existing modules from current ISRs in use.
http://www-europe.cisco.com/en/US/prod/collateral/modules/ps10598/ordering_guide_c07_557736.pdf
Also, check out this excellent Q&A doc;
http://www.cisco.com/en/US/prod/collateral/routers/ps10538/qa_c67_553891_ps10537_Products_Q_and_A_Item.html
Q. What new DSP modules are available with the Cisco 2900 and 3900 Series routers?
A. The Cisco 2900 and 3900 Series platforms support the new PVDM3 DSP module as well as the PVDM2 DSP module supported on the Cisco 2800 and 3800 Series routers. You can order the PVDM3 in six increasing densities of DS-0 channel support. Table 6 gives a complete list.
Table 6. PVDM3 Support
Name
Description
PVDM3-16
16-channel packet fax and voice DSP module
PVDM3-32
32-channel packet fax and voice DSP module
PVDM3-64
64-channel packet fax and voice DSP module
PVDM3-128
128-channel packet fax and voice DSP module
PVDM3-192
192-channel packet fax and voice DSP module
PVDM3-256
256-channel packet fax and voice DSP module
Q. Can the PVDM2 and PVDM3 DSP modules coexist on the Cisco 2900 and 3900 Series routers?
A. Yes, they can coexist as long as they are not both installed in the same domain. The motherboard PVDM slots form one domain and each SM slot forms a separate domain. The motherboard domain can contain either all PVDM2 modules or all PVDM3 modules. An SM domain can only contain PVDM2 modules housed by the NM-HDV2 carrier card. If a mix of PVDM2s and PVDM3s are detected on the motherboard, then the PVDM2s will be deactivated, allowing only the PVDM3s to be active. If PVDM2s are detected in service-module slots and PVDM3s are installed on the motherboard, then both will continue to function in their own domain and coexist.
Hope this helps!
Rob
