Cisco 8-CHANNEL PACKET VOICE PVDM-256K-8= データシート

製品コード

PVDM-256K-8=

Cisco Systems, Inc.

Page 1 of 4

Data Sheet

Cisco 4-Port High-Density FXS/DID Analog Voice Interface
Card for the Cisco

1700

Series Modular Access Routers

The Cisco 1700 Modular Access Router is designed to provide a cost-effective

integrated access platform for small and medium-sized businesses and small

enterprise branch offices. It supports advanced services e-Business features such as

VPNs; secure Internet, intranet, and extranet access with optional firewall

technology; broadband DSL and cable connectivity; and multiservice voice/video/

data/fax integration.

Figure 1

Cisco 4-Port FXS/DID
VIC with Caller ID
Support

Introduction

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 (refer to Figure 1).

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. Figure 2 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.

DSP Requirements for the

Cisco VIC-4FXS/DID

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.