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The voice functionality built into Cisco IOS software enables modular access routers to carry voice traffic, such as telephone calls and faxes, as voice over IP (VoIP) simultaneously with data traffic over LANs, MANs, and WANs. Voice network modules convert telephone voice signals into a form that can be transmitted over an IP network.
This section explains how to connect 2-channel and 4-channel voice network modules for Cisco modular routers. It contains the following sections:
This section describes the following modules:
Voice network modules convert telephone voice signals into a form that can be transmitted over an IP network. These modules have no connectors. Voice interface cards installed in the voice network module provide the connection to the telephone equipment or network.
You can install one voice interface card in a 2-channel voice network module, and two voice interface cards in a 4-channel module.
WAN and voice interface cards are described in the Cisco WAN Interface Cards Hardware Installation Guide. To obtain this publication, see the "Obtaining Documentation" section.
All network modules have an enable (EN) LED. This LED indicates that the module has passed its self-tests and is available to the router. (See Figure 9-3.)
This section describes the high-density voice (HDV) network module, shown in Figure 9-4. When used in conjunction with T1 multiflex trunk interface cards and packet voice digital signal processor (DSP) modules (PVDMs), this module is also called a digital T1 packet voice trunk network module.
The HDV network module converts voice and fax into IP packets or frames that can be transmitted as VoIP over a variety of transport technologies (channelized T1, Frame Relay, Asynchronous Transfer Mode (ATM), and others). The number of channels supported depends on the number of PVDMs installed:
Both an HDV network module and a voice interface card (VIC) are required to connect to the Public Switched Telephone Network (PSTN) or a Private Branch Exchange (PBX). One VIC (providing one or two T1 line interfaces) can be installed in the HDV network module. Currently, only the 1- and 2-port T1 multiflex trunk interface cards (VWIC-1MFT-T1, VWIC-2MFT-T1, VWIC-2MFT-T1-DI) are supported using channel-associated signaling (CAS). In Cisco 3620 and Cisco 3640 routers, at least one other network module or WAN interface card (WIC) must be installed in the router to provide the connection to the IP LAN or WAN. In Cisco 3660 routers, a network module is required for WAN access or a direct connection is required for LAN access. In Cisco 2600 series routers, a WIC is required for WAN access or a direct connection is required for LAN access.
To configure the router for voice and fax, and to configure the voice interfaces, refer to the instructions in the Voice over IP Quick Start Guide or the Voice, Video, and Home Applications Configuration Guide. To obtain these publications, see the "Obtaining Documentation" section.
The HDV network module contains five 72-pin SIMM sockets or banks for packet voice DSP modules (PVDMs), numbered 0 through 4. (See Figure 9-5.) Each socket can be filled with a single 72-pin PVDM. The PVDMs must be installed starting from slot 0.
PVDMs are manufactured with a polarization notch to ensure proper orientation and alignment holes to ensure proper positioning. Figure 9-6 shows the polarization notch and alignment holes on a PVDM card. PVDM cards are installed with the connector edge down, the polarization notch near the front of the chassis, and the component side facing the right side of the chassis.
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Caution To avoid damaging ESD-sensitive components, observe all ESD precautions. To avoid damaging the HDV network module, avoid using excessive force when you remove or replace PVDMs. |
Follow these steps to remove PVDMs:
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Caution Handle PVDMs by the card edges only. PVDMs are ESD-sensitive components and can be damaged by mishandling. |
Step 2 Remove one PVDM at a time, beginning with the PVDM in bank 4. To lift the PVDM out of its socket, pull the locking spring clips on both sides outward and tilt the PVDM toward the right side of the chassis, free of the clips. (See Figure 9-7.)
Step 3 Hold the PVDM by the edges with your thumb and index finger and lift it out of the socket. Place the removed PVDM in an antistatic bag to protect it from ESD damage.
Step 4 Repeat Step 2 and Step 3 for each PVDM.
Follow this procedure to install PVDMs:
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Caution Handle PVDMs by the card edges only. PVDMs are ESD-sensitive components and can be damaged by mishandling. |
Step 2 Hold the PVDM with the polarization notch on the right, near the front of the chassis, and the component side away from you, with the connector edge at the bottom. (See Figure 9-7.)
Step 3 Beginning with bank 0, insert the PVDM into the connector slot at an angle, tilted toward the right side of the chassis. Align the PVDM in a vertical position (see Figure 9-8), using the minimum amount of force required. When the PVDM is properly seated, the socket guide posts fit through the alignment holes, and the connector springs click into place.
Step 4 Ensure that each PVDM is straight and that the alignment holes (as shown in Figure 9-7) line up with the plastic guides on the socket.
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Caution It is normal to feel some resistance, but do not use excessive force on the PVDM, and do not touch the surface components. |
Step 5 Repeat Step 2 through Step 4 for each PVDM.
High-density network modules have an enable (EN) LED, and five LEDs for the PVDM banks, numbered 0 through 4. The enable LED indicates that the module has passed its self-tests and is available to the router. The BANK 0 through BANK 4 LEDs indicate the current operating condition of the PVDMs installed on the card. (See Figure 9-3.) If the BANK LEDs do not come on after initial installation and configuration, check that the PVDMs are properly seated in their slots.
Posted: Fri Jun 2 17:00:10 PDT 2000
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