Datasheet

Data Sheet

Adding expansion modules to the Cisco High-Density Extension Module baseboard increases voice and fax session

capacity. The modular design of the Cisco High-Density Extension Module provides maximum flexibility-plug in up to

two expansion modules in any combination to build the Cisco High-Density Extension Module best suited for specific

packet telephony network locations.

The Cisco High-Density Extension Module provides gateway services for Cisco Unified Communications using Cisco

Unified Communications Manager with Survivable Remote Site Telephony (SRST) or Cisco Unified Communications

Manager Express (UCME). Gateway services allow users to deploy networks that take advantage of investments in

existing legacy telephony equipment while also deploying and integrating IP telephony. The network can operate at

any point on the voice, video and integrated data spectrum—with the ability to add connections for both traditional

telephony devices and IP telephony endpoints.

Cisco 2821 and Cisco 2851 Extension Voice Module Slot

The Cisco High-Density Extension Module operates in the Extension Voice Module (EVM) slot on the Cisco 2821

and Cisco 2851 integrated services routers. The EVM slot supports additional voice services and density without

consuming the network module slot on the Cisco 2821 or Cisco 2851.

Cisco 3825 and Cisco 3845 Network Module Slot

The High-Density Extension Module operates in any network module or enhanced network module (NME) slot on the

Cisco 3825 and Cisco 3845 integrated services routers. The Cisco 3825 supports one Cisco High-Density Extension

Module, and the Cisco 3845 supports one or two high-density extension modules.

Cisco 2900 and Cisco 3900 Service Module Slot

The Cisco 2900 and 3900 Series Integrated Services Routers support Network Modules and EVM Modules via an

adapter (part number SM-NM-ADPTR).

High-Density Extension Module Digital Signal Processor (DSP) Resources

Packet voice DSP modules (PVDM2s) are used in combination with the Cisco High-Density Extension Module

baseboard and its expansion modules. PVDM2s support multiple voice codecs, fax, conferencing, and transcoding

services. PVDM2s are purchased separately and installed in the digital signal processor (DSP) module slots located

inside the Cisco 2821, 2851, 2901, 2911, 2921, 2951, 3825, 3845, 3925, 3925E, 3945 and 3945E Integrated

Services Routers. Initial orders for a Cisco 2821, Cisco 2851, Cisco 3825, or Cisco 3845 router that include a Cisco

High-Density Extension Module should also include an appropriate number of PVDM2s.

In addition to PVDM2, Packet voice DSP modules (PVDM3s) are also available for the same applications described

above. PVDM3s are used in combination with the Cisco High-Density Extension Module baseboard and its

expansion modules. PVDM3s support multiple voice codecs, fax, conferencing, and transcoding services. PVDM3s

are purchased separately and installed in the digital signal processor (DSP) module slots located inside the Cisco

2901, 2911, 2921, 2951, 3925, 3925E, 3945 and 3945E Integrated Services Routers. Initial orders for a Cisco 2901,

2911, 2921, 2951, 3925, 3925E, 3945 and 3945E router that include a Cisco High-Density Extension Module should

also include an appropriate number of PVDM3s. Note that PVDM3s are not supported on the ISRs. PVDM3s are

supported only on the Cisco 2900 and 3900 series platforms.

PVDM2 and PVDM3s can coexist on the Cisco 2900 and 3900 series platforms as long as both types are not

installed on the motherboard at the same time. If PVDM2 are detected on the motherboard with PVDM3s, then

PVDM2s will be deactivated, allowing only PVDM3s to be used. If PVDM2s are detected in SM slots and PVDM3s

are installed on the motherboard, then both will continue to function and coexist.