Cisco PVDM2 24DM - Digital Modem Module Manuale utente

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Cisco PVDM2-12DM, PVDM2-24DM, and

PVDM2-36DM Digital Modem Packet Voice Data

Modules

First Published: June 19, 2006

Last Updated: July 11, 2008

The Cisco digital modem packet voice data modules (Cisco PVDMs), type 2 (Cisco PVDM2s), are

high-density PVDMs containing 12, 24, or 36 digital modems. These modems provide direct digital

connection to Integrated Services Digital Network (ISDN) Primary Rate Interface (PRI) channels, to

Basic Rate Interface (BRI) channels, and to channel associated signaling (CAS) digital trunk lines. The

PVDM2s are installed in Cisco 2800 series and Cisco 3800 series integrated services routers.

Finding Feature Information in This Module

Your Cisco IOS software release may not support all of the features documented in this module. To reach

links to specific feature documentation in this module and to see a list of the releases in which each feature is

supported, use the “Feature Information for Digital Modem PVDM2s” section on page 47.

Finding Support Information for Platforms and Cisco IOS Software Images

Use Cisco Feature Navigator to find information about platform support and Cisco IOS and software image

support. To access Cisco Feature Navigator, go to <http://www.cisco.com/go/cfn>. An account on Cisco.com

is not required.

Contents

•Prerequisites for Cisco Digital Modem PVDM2s, page 2

•Restrictions for Cisco Digital Modem PVDM2s, page 3

•Information About Cisco Digital Modem PVDM2s, page 4

•How to Configure Digital Modem PVDM2s, page 4

•Configuration Examples for Digital Modem PVDM2s, page 22

•Additional References, page 25

Cisco PVDM2-12DM, PVDM2-24DM, and PVDM2-36DM Digital Modem Packet Voice Data Modules

Prerequisites for Cisco Digital Modem PVDM2s

Cisco IOS Release 12.4(9)T, 12.4(11)XW, and 12.4(20)T

•Command Reference, page 26

•Feature Information for Digital Modem PVDM2s, page 47

Prerequisites for Cisco Digital Modem PVDM2s

Supported Platforms

The following Cisco integrated services routers are supported for the digital modem PVDM2s:

•Cisco 2811

•Cisco 2821

•Cisco 2851

•Cisco 3825

•Cisco 3845

Network Interfaces

LAN connections are provided through your router’s Fast Ethernet or Gigabit Ethernet ports.

For information on how to configure the LAN interfaces on your router, see the Configuring Fast

Ethernet and Gigabit Ethernet Interfaces section of Basic Software Configuration Using the Cisco IOS

Command-Line Interface.

WAN connections are provided through Cisco network modules and interface cards. The digital modem

PVDM2s are supported with the following:

•Network modules (supported in Cisco IOS Releases 12.4(9)T and later):

–

NM-1CE1T1-PRI

–

NM-2CE1T1-PRI

•Interface cards (supported in Cisco IOS Releases 12.4(11)XW and later):

–

HWIC-1CE1T1-PRI

–

HWIC-2CE1T1-PRI

–

VIC2-2BRI-NT/TE

For information on how to install Cisco network modules, see the Cisco Network Module Hardware

Installation Guide.

For information on how to install Cisco interface cards, see the Cisco Interface Card Hardware

Installation Guide.

Cisco PVDM2-12DM, PVDM2-24DM, and PVDM2-36DM Digital Modem Packet Voice Data Modules

Restrictions for Cisco Digital Modem PVDM2s

Cisco IOS Release 12.4(9)T, 12.4(11)XW, and 12.4(20)T

PVDM2 Installation

Install the digital modem PVDM2s in the PVDM chassis slots on your router’s motherboard.

•To install PVDM2s in Cisco 2800 series routers, see Installing and Upgrading Internal Modules in

Cisco 2800 Series Routers.

•To install PVDM2s in Cisco 3800 series routers, see Installing and Upgrading Internal Modules in

Cisco 3800 Series Routers.

Basic Information for Configurations

Make sure that you have the following information:

•Channel-group information and time-slot mapping

•ISDN PRI/BRI configuration parameters

•T1 or E1 information, such as line code and framing type

Restrictions for Cisco Digital Modem PVDM2s

The following restrictions apply to the Cisco digital modem PVDM2s:

•Digital modem PVDM2s can be inserted only into PVDM2 slots on the motherboards of Cisco

routers. Initially, these routers are the Cisco 2800 series and Cisco 3800 series integrated services

routers named in the “Supported Platforms” section on page 2.

•Initial bootup time to download CSM V12 firmware to the digital modem PVDM2s may be two to

four minutes due to architectural limitations.

•Digital modem PVDM2s are supported over ISDN BRI in Cisco IOS Releases 12.4(11)XW and later.

•There is no voice support.

Cisco PVDM2-12DM, PVDM2-24DM, and PVDM2-36DM Digital Modem Packet Voice Data Modules

Information About Cisco Digital Modem PVDM2s

Cisco IOS Release 12.4(9)T, 12.4(11)XW, and 12.4(20)T

Information About Cisco Digital Modem PVDM2s

This section provides information about digital modem PVDM2s.

•PVDM Line Numbering on Cisco Integrated Services Routers, page 4

•Mixing Digital Modem PVDM2s with Voice PVDMs, page 4

PVDM Line Numbering on Cisco Integrated Services Routers

This section describes the PVDM line numbering scheme for Cisco integrated services routers. Table 1

shows the line numbering scheme for digital modem PVDM2s installed in Cisco 2800 series and

3800 series routers.

Table 1 gives the line number assigned to the first modem in the PVDM. The remaining modems are

assigned successively increasing line numbers. Some examples are:

•A PVDM2-12DM module is installed in the PVDM 0 slot of a Cisco 2811 router. The 12 modems

on the module are assigned line numbers 322 to 333.

•A PVDM2-24DM module is installed in the PVDM 1 slot of a Cisco 3825 router. The 24 modems

on the module are assigned line numbers 386 to 409.

•A PVDM2-36DM module is installed in the PVDM3 slot of a Cisco 3845 router. The 36 modems

on the module are assigned line numbers 642 to 677.

Mixing Digital Modem PVDM2s with Voice PVDMs

There are no restrictions on the mixing of digital modem PVDM2s with Cisco voice PVDMs within the

supported platforms.

How to Configure Digital Modem PVDM2s

Complete the following tasks to configure the digital modem PVDM2s.

•Tasks Common to All Configurations, page 5

•Configuration Using NM-xCE1T1-PRI Network Modules, page 15

•Configuration Using HWIC-xCE1T1-PRI, page 19

•Configuration Using VIC2-2BRI-NT/TE, page 20

Table 1 PVDM Line Numbering on Cisco Integrated Services Routers

Platform PVDM 0 PVDM 1 PVDM 2 PVDM 3

Cisco 2811 322 386 N/A N/A

Cisco 2821,

Cisco 2851

322 386 450 N/A

Cisco 3825 322 386 450 514

Cisco 3845 450 514 578 642

Cisco PVDM2-12DM, PVDM2-24DM, and PVDM2-36DM Digital Modem Packet Voice Data Modules

How to Configure Digital Modem PVDM2s

Cisco IOS Release 12.4(9)T, 12.4(11)XW, and 12.4(20)T

Tasks Common to All Configurations

Complete the following tasks for all configurations of digital modem PVDM2s.

•Configuring the Loopback Interface, page 5 (required)

•Configuring the Modem Country Code, page 6 (required)

•Configuring Modem Lines for Dial-In and Dial-Out, page 6 (required)

•Configuring the Default IP Pool Information, page 8 (required)

•Creating Group Asynchronous Interfaces, page 8 (required)

•Configuring the Dialer Interface, page 10 (required)

•Configuring Modem Pooling, page 11 (optional)

•Configuring Modem Recovery, page 12 (optional)

•Loading Modem Firmware, page 13 (optional)

Configuring the Loopback Interface

The loopback 0 interface is the interface that dial-in users access when dialing in to the network. Usually,

all dial-in users are assigned to a single IP subnet. This subnet can be identified with the loopback 0

interface, a logical interface whose network number can be borrowed by each asynchronous dial-in

interface.

To configure the loopback 0 interface, perform the following tasks, beginning in global configuration mode:

SUMMARY STEPS

1. interface Loopback number

2. ip address ip-address ip-address mask

DETAILED STEPS

Command or Action Purpose

Step 1 interface Loopback number

Example:

Router(config)# loopback 0

Selects the loopback 0 interface.

Step 2 ip address ip-address ip-address mask

Example:

Router(config-if)# ip address 127.0.0.1

255.255.0.0

Assigns an IP address and subnet mask to the loopback 0

interface.

Cisco PVDM2-12DM, PVDM2-24DM, and PVDM2-36DM Digital Modem Packet Voice Data Modules

How to Configure Digital Modem PVDM2s

Cisco IOS Release 12.4(9)T, 12.4(11)XW, and 12.4(20)T

Configuring the Modem Country Code

To configure the modem country code for a bank of V12 modems, use the modem country v12

command in global configuration mode.

SUMMARY STEPS

1. modem country v12 country

DETAILED STEPS

Configuring Modem Lines for Dial-In and Dial-Out

The following tasks configure modem lines for dial-in and dial-out.

•Configuring Modems for Dial-In, page 6 (required)

•Configuring Modems for Dial-Out, page 7 (required)

Configuring Modems for Dial-In

Beginning in global configuration mode, follow these steps to configure modem lines for dial-in.

SUMMARY STEPS

1. line start-range end-range

2. modem inout

3. transport input all

Command or Action Purpose

Step 1 modem country v12 country

Example:

Router(config)# modem country v12 t1-default

Configures the modem country code for the bank of V12

modems in your digital modem PVDM2s.

Default for T1 connections is t1-default.

Default for E1 connections is e1-default.

Cisco PVDM2-12DM, PVDM2-24DM, and PVDM2-36DM Digital Modem Packet Voice Data Modules

How to Configure Digital Modem PVDM2s

Cisco IOS Release 12.4(9)T, 12.4(11)XW, and 12.4(20)T

DETAILED STEPS

Configuring Modems for Dial-Out

To configure the modem lines for dial-out, perform the following tasks, beginning in global configuration

mode:

SUMMARY STEPS

1. line start-range end-range

2. rotary number

3. transport input telnet

4. modem inout

DETAILED STEPS

Command or Action Purpose

Step 1 line start-range end-range

Example:

Router(config)# line 334 345

Selects the modem lines for dial-in and switch to the line

configuration mode.

Step 2 modem inout

Example:

Router(config-line)# modem inout

Configures the line for both incoming and outgoing calls.

Step 3 transport input all

Example:

Router(config-line)# transport input all

Selects the protocol used to connect to the router. all selects

all protocols.

Command or Action Purpose

Step 1 line start-range end-range

Example:

Router(config)# line 322 333

Selects the modem lines for dial-out and switch to the line

configuration mode.

Step 2 rotary number

Example:

Router(config-line)# rotary 1

Sets the router to use previously-defined rotary group.

Cisco PVDM2-12DM, PVDM2-24DM, and PVDM2-36DM Digital Modem Packet Voice Data Modules

How to Configure Digital Modem PVDM2s

Cisco IOS Release 12.4(9)T, 12.4(11)XW, and 12.4(20)T

Configuring the Default IP Pool Information

You need to set a range of IP addresses in the default IP pool. These IP addresses are used for dial-in users.

To set the range of addresses, perform the following task in global configuration mode:

SUMMARY STEPS

1. ip pool local default low-ip-address [high-ip-address]

2. ip default gateway number

3. ip classless

DETAILED STEPS

Creating Group Asynchronous Interfaces

A group asynchronous interface is a parent interface that applies protocol characteristics to specified,

associated asynchronous interfaces. After you create a group asynchronous interface, all associated

asynchronous interfaces (called members) can be configured through it. Group asynchronous interfaces

can speed configuration time and help you maintain interface configuration consistency.

Beginning in global configuration mode, follow these steps to configure a group asynchronous interface.

Step 3 transport input telnet

Example:

Router(config-line)# transport input telnet

Configures the router to accept inbound Telnet connections.

Step 4 modem inout

Example:

Router(config-line)# modem inout

Configures the line for both incoming and outgoing calls.

Command or Action Purpose

Step 1 ip pool local default low-ip-address

[high-ip-address]

Example:

Router(config)# ip pool local default

172.16.0.1 172.16.0.36

Sets the range of addresses in the default IP pool to be

assigned to inbound callers.

Step 2 ip default gateway number

Example:

Router(config)# ip default gateway 101

Defines a default gateway (router) when IP routing is

disabled.

Step 3 ip classless

Example:

Router(config)# ip classless

Forwards packets destined for a subnet of a network that has

no network default route.

Cisco PVDM2-12DM, PVDM2-24DM, and PVDM2-36DM Digital Modem Packet Voice Data Modules

How to Configure Digital Modem PVDM2s

Cisco IOS Release 12.4(9)T, 12.4(11)XW, and 12.4(20)T

SUMMARY STEPS

1. interface group-async number

2. ip unnumbered Loopback number

3. encapsulation ppp

4. dialer in-band

5. async mode interactive | dedicated

6. peer default ip address pool name

7. no cdp enable

8. group-range start-range end-range

DETAILED STEPS

Command or Action Purpose

Step 1 interface group-async number

Example:

Router(config)#interface group-async 1

Creates a group asynchronous interface.

Step 2 ip unnumbered Loopback number

Example:

Router(config-if)#ip unnumbered Loopback 0

Enables IP processing on the loopback interface without

assigning an explicit IP address to the interface.

Step 3 encapsulation ppp

Example:

Router(config-if)#encapsulation ppp

Sets the Point-to-Point Protocol (PPP) as the encapsulation

method used by this interface.

Step 4 dialer in-band

Example:

Router(config-if)# dialer in-band

Specifies that dial-on-demand routing (DDR) be supported.

Step 5 async mode interactive | dedicated

Example:

Router(config-if)#async mode interactive

interactive enables SLIP and PPP EXEC commands on this

interface. dedicated disables SLIP and PPP EXEC

commands, and sets the encapsulation to what is configured

for the interface.

Step 6 peer default ip address pool name

Example:

Router(config-if)#peer default ip address pool

name

Specifies an IP address from the defined IP address pool to

be returned to a remote peer connecting to this interface.

Cisco PVDM2-12DM, PVDM2-24DM, and PVDM2-36DM Digital Modem Packet Voice Data Modules

How to Configure Digital Modem PVDM2s

Cisco IOS Release 12.4(9)T, 12.4(11)XW, and 12.4(20)T

Configuring the Dialer Interface

The dialer interface is the parent interface that holds the central protocol characteristics for the dialer-rotary

group. To configure the dialer interface, perform the following tasks, beginning in global configuration mode:

SUMMARY STEPS

1. interface Dialer number

2. ip unnumbered Loopback number

3. no ip mroute-cache

4. encapsulation ppp

5. peer default ip address pool name

6. dialer in-band

7. dialer-group number

8. no fair-queue

9. no cdp enable

DETAILED STEPS

Step 7 no cdp enable

Example:

Router(config-if)#no cdp enable

Disables Cisco Discovery Protocol on this interface.

Step 8 group-range start-range end-range

Example:

Router(config-if)#group-range 0/322 0/345

Associates one or more interfaces to the group interface so

that all associated interfaces can be configured through the

group interface.

Command or Action Purpose

Step 1 interface Dialer number

Example:

Router(config)# interface dialer 101

Defines a dialer rotary group leader.

Step 2 ip unnumbered Loopback number

Example:

Router(config-if)# ip unnumbered loopback 0

Enables IP processing on the loopback interface without

assigning an explicit IP address to the interface.

Step 3 no ip mroute-cache

Example:

Router(config-if)# no ip mroute cache

Disables IP multicast fast switching.

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