Cisco Systems OL-12812-01 User Manual

Connecting Cisco Voice Network Modules to the
Network

Revised: May 1, 2008, OL-12812-01

This guide describes how to connect Cisco voice network modules to your network. It contains the
following sections:

• Voice Network Modules, page 1

• 2- and 4-Channel Voice Network Modules, page 2

• 4-, 8-, and 48-Channel High-Density Voice Network Modules, page 2

• 60-Channel High-Density Voice Network Module, page 3

• Voice Network Module LEDs, page 7

• IP Communications High-Density Digital Voice or Fax Network Module, page 8

• Related Documents, page 16

• Obtaining Documentation, Obtaining Support, and Security Guidelines, page 17

Voice Network Modules

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.

Voice network modules convert telephone voice signals into a form that can be transmitted over an IP
network. These modules have one or two slots for installing supported interface cards. Voice interface
cards (VICs) or voice/WAN interface cards (VWICs) installed in the voice network module provide
physical connections to the telephony equipment or network, and are connected using the appropriate
cables.

You can install one voice interface card in a 1-slot voice network module, and two voice interface cards
in a 2-slot module.

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Connecting Cisco Voice Network Modules to the Network

2- and 4-Channel Voice Network Modules

2- and 4-Channel Voice Network Modules

This section describes the following modules:

• 1-slot 2-channel voice network module (NM-1V) (see Figure 1)

• 2-slot 4-channel voice network module (NM-2V) (see Figure 2)

Figure 1 1-Slot 2-Channel Voice Network Module (NM-1V)

VOICE
2V

Figure 2 2-Slot 4-Channel Voice Network Module (NM-2V)

VOICE
2V

Module

screw

1

V0V1

EN

H10834

Module

screw

V0V1

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H10833

Enable

LED

4-, 8-, and 48-Channel High-Density Voice Network Modules

This section describes the following modules:

• 1-slot 4-channel high-density voice network module with one digital signal processor (DSP)

(NM-HD-1V) (see Figure 3)

• 2-slot 8-channel high-density voice network module with one DSP (NM-HD-2V) (see Figure 4)

• 2-slot 48-channel high-density enhanced network module with 3 DSPs, supporting up to 8 analog or

48 digital channels (NM-HD-2VE) (see Figure 5)

Caution To comply with the Telcordia GR-1089 NEBS standard for electromagnetic compatibility and safety,

connect the 2-slot 48-channel high-density enhanced network module (NM-HD-2VE) only to
intrabuilding or nonexposed wiring or cabling. The intrabuilding cable must be shielded and the shield
must be grounded at both ends.

Connecting Cisco Voice Network Modules to the Network

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Connecting Cisco Voice Network Modules to the Network

Note For the NM-HD-1V, NM-HD-2V, and NM-DS-2VE network modules, DSPs are on-board and are not

field-replaceable units (FRUs).

Note The NM-HD-1V, NM-HD-2V, and NM-HD-2VE network modules replace the NM-1V and NM-2V

network modules. The NM-1V and NM-2V network modules are still available for use on Cisco 2600
series, Cisco 3600 series, and Cisco 3700 series routers.

Figure 3 1-Slot 4-Channel High-Density Network Module (NM-HD-1V)

NM-HD

-1V

60-Channel High-Density Voice Network Module

V0

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Figure 4 2-Slot 8-Channel High-Density Voice Network Module (NM-HD-2V)

NM-HD

-2V

V1

Figure 5 2-Slot 48-Channel High-Density Voice Network Module (NM-HD-2VE)

NM-HD

-2VE

V1

60-Channel High-Density Voice Network Module

V0

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V0

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89035

This section describes the 60-channel high-density voice (HDV) network module, shown in Figure 6.
When used in conjunction with T1/E1 multiflex trunk interface cards and packet voice digital signal
processor modules (PVDMs), this module is also called a digital T1/E1 packet voice trunk network
module.

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60-Channel High-Density Voice Network Module

Figure 6 60-Channel High-Density Voice Network Module (NM-HDV)

NM-HDV

BANK 4 BANK 3 BANK 2

The 60-channel 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/E1, Frame Relay,
Asynchronous Transfer Mode (ATM), and others). The number of channels supported depends on the
number of PVDMs installed:

• Up to 6 channels per PVDM (30 channels for cards with 5 PVDMs) for high-complexity vocoders

that support the following compression algorithms: G.711, G.726, G.729, G.723.1, G.728, and Fax
Relay

• Up to 12 channels per PVDM (60 channels for cards with 5 PVDMs) for medium-complexity

vocoders that support the following compression algorithms: G.711, G.726, G.729a, and Fax Relay

Both a 60-channel HDV network module and a voice interface card (VIC) are required to connect to the
public switched telephone network (PSTN) or a PBX. One VIC (providing one or two T1/E1 line
interfaces) can be installed in the HDV network module. Currently, only the 1- and 2-port T1/E1
multiflex trunk interface cards (VWIC-1MFT-T1, VWIC-2MFT-T1, and 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.

BANK 1

BANK 0

Connecting Cisco Voice Network Modules to the Network

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Packet Voice DSP Modules

The HDV network module contains five 72-pin SIMM sockets or banks for packet voice DSP modules
(PVDMs), numbered 0 through 4. (See Figure 7.) Each socket can be filled with a single 72-pin PVDM.
The PVDMs must be installed starting from slot 0.

Note PVDM and PVDM2 modules are not interchangeable. Use PVDM modules with the NM-HDV network

module only, and use PVDM2 modules with the NM-HDV2 network module only.

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Connecting Cisco Voice Network Modules to the Network

Figure 7 PVDM Slot Locations

4 3 2 1 0

60-Channel High-Density Voice Network Module

PVDM Orientation

Caution To avoid damaging ESD-sensitive components, observe all ESD precautions. To avoid damaging the

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PVDM slots

PVDMs are manufactured with a polarization notch to ensure proper orientation and alignment holes to
ensure proper positioning. Figure 8 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.

HDV network module, avoid using excessive force when you remove or replace PVDMs.

Figure 8 PVDM Orientation

Alignment holes

Connector edge

Polarization notch

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5

60-Channel High-Density Voice Network Module

Removing PVDMs

To remove PVDMs, follow these steps:

Step 1 Find the PVDM sockets on the HDV network module. (See Figure 7.)

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.)

Figure 9 Removing PVDMs

Connecting Cisco Voice Network Modules to the Network

Top view

Front of chassis

Step 3

Step 4 Repeat Step 2 and Step 3 for each PVDM.

Installing PVDMs

Step 1 Find the PVDM sockets on the HDV network module. (See Figure 7.)

2. Push the top of the
PVDM forward and down.

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1. Pull the locking spring clips outward.

PVDM
polarization
notch

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.

To install PVDMs, follow these steps:

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 8.)

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