Cisco Cisco NM-2V Two Voice Fax Interface Card Slot Network Module 技术手册

Introduction
 Prerequisites
      Requirements
      Components Used
      Conventions
 Background Information
      Key Features
      FXS and FXO Interfaces
      Network Clock Timing
 Configure
 Verifying
      Network Diagram
      Configurations
 Troubleshoot
      Connecting Calls from Groundstart Signaling Voice Port

The High−Density Analog (FXS/DID/FXO) and Digital (BRI) Extension Module for Voice/Fax (EVM−HD)
feature delivers a higher−density integrated analog/digital voice interface. The EVM−HD−8FXS/DID
baseboard network module provides eight Foreign Exchange Station (FXS) or direct inward dialing (DID)
ports. This network module accesses digital signal processor (DSPs) modules on the motherboard, instead of
using onboard DSPs. You can increase the port density by plugging in up to two optional expansion modules
in any combination:

EM−HDA−8FXS−−8−port FXS voice/fax expansion module

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EM−HDA−3FXS/4FXO−−3−port FXS and 4−port FXO voice/fax expansion module

• 

EM−HDA−6FXO−−6−port FXO voice/fax expansion module

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EM−4BRI−NT/TE−−4−port ISDN BRI expansion module

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PVDM2 DSP modules are used in combination with the EVM−HD−8FXS/DID baseboard and its expansion
modules. PVDM2 modules are available separately and installed in the DSP module slots located inside the
router chassis.

Before attempting this configuration, ensure that you meet these requirements:

Insert the network modules in the correct slots of the router at your installation.

• 

Install DSPs on the baseboard and configure the DSPs with a voice−enabled image of Cisco IOS
Release 12.3(8)T4 or 12.3(11)T or a later release.

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The minimum Cisco IOS Release for this feature is Release 12.3(8)T4. For optimum results, use

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