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The 4-port high-density FXS/DID VIC can support up to 4 foreign-exchange-station (FXS) ports for directly connecting phones or fax machines, or it can be used to connect up to four direct-inward-dial (DID) analog trunks, providing customers the flexibility they need for their unique business environment . Each port on the 4-Port FXS/DID VIC is selectable for use in either FXS or DID mode. The 4-Port FXS/DID VIC is the same size as the existing two-port voice interface cards (VICs), allowing it to slide into either WIC/VIC slot or VIC slot in Cisco 1751 and 1760. The Cisco 1751 can support three VIC-4FXS/DID cards with a maximum of four ports in DID mode. The Cisco 1760 can support four VIC-4FXS/DID cards with a maximum of eight ports in DID mode.shows a typical application of 4-port VIC-FXS/DID in a small enterprise branch office with KTS or small PBX. The VIC-4FXS/DID in the Cisco 1700 is used to connect analog phones or fax machines. The long-distance calls between small enterprise branch offices and headquarters are carried by IP network, while the local calls are carried by PSTN, which also provide backup to the IP network.
For Cisco 1751 and 1760 routers, the medium-complexity analog digital-signal-processor (DSP) image is the factory default for supporting the 4-Port FXS/DID VIC. This DSP image provides support for four voice channels (of G.711, G.729a, or G.726) for each DSP chip. For example, the Cisco PVDM-256K-4 DSP Module has one DSP chip and is, therefore, capable of supporting four voice channels on the 4-Port FXS/DID VIC. The medium-complexity analog DSP software image supports four channels of G.711, G.729a, G.726, fax relay, or modem or fax pass-through, and it provides support for 32-msec echo cancellation per DSP chip.
The 4-Port FXS/DID VIC also support the high-complexity analog DSP software image. This DSP image provides support for two voice channels (of G.711, G.729, G.723.1, G.728, or G.726) for each DSP chip. Therefore, a Cisco PVDM-256K-8 Module (two DSP chips) is required to support four voice channels on the 4-Port FXS/DID VIC. The high-complexity analog DSP image supports two channels of G.711, G.729, G.726, G.728, G.723.1, fax relay, or modem or fax pass-through, and it provides support for 32-msec echo cancellation per DSP chip.