Cisco PVDM2 24DM - Digital Modem Module User manual

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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
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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
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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
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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
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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
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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
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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
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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
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
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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
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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
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.