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- Description
- Specifications
The PVDM-256K-4 is a Cisco 4-channel packet voice/fax DSP module with one DSP. The PVDM-256K module family is based on the C549 DSP chipset. A Cisco 1760-V router ships with a PVDM-256K-4 in a DSP module slot, which covers one two-port analog voice interface card without further DSP resources.
The Cisco 1760 has two DSP module slots on the motherboard. Each slot takes a module of up to five DSPs, with a maximum of ten DSPs in the router. Larger modules are the PVDM-256K-8, PVDM-256K-12, PVDM-256K-16 and PVDM-256K-20, and factory upgrades of the 4-channel module run from PVDM-256K-4U8 to PVDM-256K-4U20.
For DSP farm duty, each DSP on a PVDM-256K module is a single conference bridge that accepts G.711 or G.729 calls, with up to 6 participants per bridge. The NM-HDV takes up to 5 PVDM-256K modules and Cisco 1700 series routers take 1 or 2. PVDM-256K and PVDM2 DSPs have different DSP farm configurations, and only one type is configured in a router at a time.
The Cisco 1751 is limited to 5 conference calls per chassis and the Cisco 1760 supports 20. More voice modules are in Cisco interface cards.
Related part: PVDM-256K-8 Cisco Packet Voice/Fax DSP Module
| Part number | PVDM-256K-4 |
| Type | Packet voice/fax DSP module |
| Channels | 4 |
| DSPs | 1 |
| DSP chipset | C549 (PVDM-256K family) |
| Conference bridge | One per DSP, G.711 or G.729, up to 6 participants |
| Cisco 1760 | 2 DSP slots, up to 5 DSPs per slot, 10 DSPs maximum |
| Cisco 1700 series | 1 or 2 PVDM-256K modules |
| NM-HDV | Up to 5 PVDM-256K modules |
| Larger modules | PVDM-256K-8, -12, -16, -20 |
| Factory upgrades | PVDM-256K-4U8, -4U12, -4U16, -4U20 |
| Compatible with | Cisco 1751 and 1760 routers, NM-HDV network module |