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

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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.

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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.

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Information About Cisco Digital Modem PVDM2s
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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

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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.

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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.

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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.

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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.

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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.

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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.

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Configuring Modem Pooling
Modems may be pooled so that specific ranges of the available modems are assigned to the various called
numbers handled by your system.
Note Any modem not assigned to a defined modem pool is assigned to the default modem pool.
Restrictions
If you are using modem pooling in a CAS configuration, the following restrictions apply:
•There must be at least one modem in the default modem pool for the modem pooling feature to work
for CAS calls. This is because every time a CAS call is made, a modem in the default pool is used
to collect the digits of the called number. Once the digits are collected, the call is forwarded to the
appropriate modem pool. One of the modems in that pool will be allocated for the call, and the
modem in the default pool will then be released. If there are no available modems in the default pool,
the call will not go through.
•Whenever signaling type e&m-fgb is specified in the ds0-group command, it is necessary to
configure dtmf dnis as part of the signaling type.
Router(config)# ds0-group 1 timeslots 1-24 type e&m-fgb dtmf dnis
Step 4 encapsulation ppp
Example:
Router(config-if)# encapsulation ppp
Sets the PPP as the encapsulation method used by this
interface.
Step 5 peer default ip address pool name
Example:
Router(config-if)#
Specifies an IP address from the defined IP address pool to
be returned to a remote peer connecting to this interface.
Step 6 dialer in-band
Example:
Router(config-if)# dialer in-band
Specifies that dial-on-demand routing (DDR) be supported.
Step 7 dialer-group number
Example:
Router(config-if)# dialer-group 1
Assigns this interface to the rotary dialer group.
Step 8 no fair-queue
Example:
Router(config-if)# no fair-queue
Disables fair weighted queuing for this interface.
Step 9 no cdp enable
Example:
Router(config-if)# no cdp enable
Disables Cisco Discovery Protocol on this interface.
Command or Action Purpose

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When dtmf dnis is part of the ds0-group command, functions in CSM V12 firmware collect the
digits of the called number and match them to the called number in the appropriate modem pool,
putting the call through. If dtmf dnis is not part of the ds0-group command, these functions are
never activated and no called number match is made, resulting in a default pool modem being used
instead of a modem from the correct pool. The call will not go through in such a case.
SUMMARY STEPS
1. modem-pool name
2. pool-range modem1-modemN
3. called-number number max-conn number
DETAILED STEPS
Configuring Modem Recovery
The modem recovery feature is present to detect bad modems and mark them, saving the user from the
task of doing this manually. If there are spare modems in the platform, this process could prevent callers
from getting dead air or busy signals.
The modem recovery feature uses two CLI commands. The modem recovery threshold command sets
the number of consecutive failures that a modem must experience before the recovery process is
performed. The modem recovery action command defines the action taken on the failed modem. The
recovery action will either be “disable”, where the IOS will mark the modem bad, or will be “none”,
where nothing will happen to the modem and the threshold counter will be reset.
A modem failure is defined as any time that the CSM assigns a call to a modem, but that modem does
not reach steady state. The call would be classed as a “no answer” or as a trainup failure.
To configure modem recovery, enter the following commands in global configuration mode.
SUMMARY STEPS
1. modem recovery threshold failed-calls
2. modem recovery action {disable | none}
Command or Action Purpose
Step 1 modem-pool name
Example:
Router(config)# modem-pool tito
Assigns a name to the modem pool.
Step 2 pool-range modem1-modemN
Example:
Router(config)# pool-range 386-388
Specifies the range of modem numbers assigned to
the modem pool.
If the modem pool consists of a single modem, the
modem number of that modem is entered by itself, as
in pool-range 386, for example.
Step 3 called-number number max-conn number
Example:
Router(config)# called-number 5557528 max-conn 3
Specifies a called number assigned to the modem
pool. The variable max-conn specifies the
maximum number of simultaneous calls that may be
connected to the called number.

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DETAILED STEPS
Example
The following configuration will result in a modem being marked bad by the IOS after 8 consecutive
failures.
router(config)# modem recovery threshold 8
router(config)# modem recovery action disable
Loading Modem Firmware
To load a different version of CSM V12 firmware into the digital modem PVDM2s, use the
modem firmware command in global configuration mode.
Note It may take two to four minutes for the new version to appear.
SUMMARY STEPS
1. configure terminal
2. modem firmware slot slot-number location ifsfilename
3. exit
Command or Action Purpose
Step 1 modem recovery threshold failed-calls
Example:
Router(config)# modem recovery threshold 10
Specifies the number of consecutive failure that
must occur on a modem before modem recovery
action takes place.
The range is 0 to 1000. The default value is 30.
Step 2 modem recovery action {disable | none}
Example:
Router(config)# modem action recovery disable
Specifies the action to be taken on a modem when its
modem recovery threshold is reached. disable will
cause the IOS to mark the modem as bad and remove
it from service. none will reset the threshold counter
for the modem, but will do nothing else. The modem
stays in service.

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DETAILED STEPS
Verification of Firmware Loading
Use the show modem version command to verify that the new firmware version has been downloaded
to the modems. In the example shown here, the router has a PVDM2-24DM module with 24 digital
modems (channel numbers 386 to 409). Version 3.07 of the firmware is replaced with version 3.08.
Version 3.08 is stored in the file flash:V3_08.axf in the router’s flash memory.
Before the download takes place, the show modem version command shows the following:
Router#show modem version
Slot 0:
PVDM 1: PVDM2-24DM - HW Version 1, FPGA Version 3.2, NiOS(2) 5.0.1
Modem 0/386-0/397:
PCI Classid: 0x07800001 Bootrom Rev: 0x00005601 Diag Result: 0x0000007F
Firmware: V3.07
Modem 0/398-0/409:
PCI Classid: 0x07800001 Bootrom Rev: 0x00005601 Diag Result: 0x0000007F
Firmware: V3.07
Router#
Download the firmware as follows:
Router>configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#modem firmware slot 0 location flash:V3_08.axf
This command will disconnect any active calls.
Proceed with firmware upgrade? [confirm]
Modem Slot 0: Started firmware download.
Modem 0/386 - 0/409 ...
Modem Slot 0: Completed firmware download
Router(config)#exit
Router#
Command or Action Purpose
Step 1 configure terminal
Example:
Router# configure terminal
Enters router configuration mode.
Step 2 modem firmware slot slot-number location
ifsfilename
Example:
Router(config)# modem firmware slot 0 location
flash:V3_08.axf
Loads a different version of CSM V12 firmware into the
digital modem PVDM2s.
•slot-number specifies the chassis slot that contains the
PVDM modules with CSM V12 digital modems. In ISR
routers, slot 0, the router’s motherboard, is the chassis
slot for all digital modem PVDM2s.
•ifsfilename specifies the Cisco IOS file system (IFS)
filename of the CSM V12 firmware to be loaded into
the modem.
Step 3 exit
Example:
Router(config)# exit
Exits global configuration mode.

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After the download takes place, the show modem version command shows the following:
Router#show modem version
Slot 0:
PVDM 1: PVDM2-24DM - HW Version 1, FPGA Version 3.2, NiOS(2) 5.0.1
Modem 0/386-0/397:
PCI Classid: 0x07800001 Bootrom Rev: 0x00005601 Diag Result: 0x0000007F
Firmware: V3.08
Modem 0/398-0/409:
PCI Classid: 0x07800001 Bootrom Rev: 0x00005601 Diag Result: 0x0000007F
Firmware: V3.08
Router#
Configuration Using NM-xCE1T1-PRI Network Modules
To configure NM-CE1T1 network modules for PRI operation or CAS operation, perform the following
procedures.
•Configuring the T1/E1 Network Module, page 15 (required)
•Configuring ISDN Digital Modem Calls (PRI), page 16 (optional)
•Configuring Digital Trunk Calls (CAS), page 18 (optional)
Configuring the T1/E1 Network Module
The first step in configuring a digital modem interface is to configure the channelized T1 or E1 network
module. The Cisco NM-1CE1T1-PRI network module has one port; The Cisco NM-2CE1T1-PRI network
module has two ports. If the network module installed in your router has two ports, you need to do the
following procedure on both ports.
SUMMARY STEPS
1. card type {t1 | e1} slot
2. network-clock-participate slot slot-number
3. network-clock-select priority {t1 | e1} slot/port
4. controller {t1 | e1} slot/port
5. framing {sf | esf | crc4 | no crc4}
6. linecode {ami | b8zs | hdb3}

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DETAILED STEPS
Configuring ISDN Digital Modem Calls (PRI)
Perform the following procedures to complete the configuration of digital modem PVDM2s for ISDN
digital data calls.
•Configuring the ISDN Switch Type and PRI Group, page 17 (required)
•Configuring the ISDN D-Channel Serial Interface, page 17 (required)
Command or Action Purpose
Step 1 card type {t1 | e1} slot
Example:
Router(config)# card type t1 1
Specifies the network module type in the named slot.
Step 2 network-clock-participate slot slot-number
Example:
Router(config-if)# network-clock-participate
slot 1/0
Allows the ports on a specified network module to use the
network clock for timing.
Step 3 network-clock-select priority {t1 | e1}
slot/port
Example:
Router(config-if)# network-clock-select 1 t1
1/0
Specifies the clocking configuration for the selected port.
Step 4 controller {t1 | e1} slot/port
Example:
Router(config-if)# controller t1 1/0
Allows configuration of the selected T1 or E1 controller.
Step 5 framing {sf | esf | crc4 | no crc4}
Example:
Router(config-if)# framing esf
Specifies frame type for a T1 or E1 connection.
•sf selects super frame type for T1.
•esf selects extended super frame type for T1.
•crc4 selects crc4 frame type for E1.
•no crc4 selects no crc4 frame type for E1.
Step 6 linecode {ami | b8zs | hdb3}
Example:
Router(config-if)# linecode b8zs
Selects the linecode type for a T1 or E1 connection.
•ami specifies ami linecode type. Valid for T1 and E1.
Default value for T1.
•b8zs specifies b8zs linecode type. Valid for T1 only.
•hdb3 specifies linecode type hdb3. Default value for
E1.

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 ISDN Switch Type and PRI Group
Perform the following steps to properly connect with the ISDN central office and to define the group of
timeslots used.
SUMMARY STEPS
1. isdn switch-type switch-type
2. pri-group timeslots timeslot-range
DETAILED STEPS
Configuring the ISDN D-Channel Serial Interface
When you configure ISDN PRI on a channelized E1 or channelized T1 controller, you create a
corresponding D-channel serial interface used to carry signaling messages for that PRI group. For E1
modules, channel 15 is the D-channel. For T1 modules, channel 23 is the D-channel. You must configure
this signaling interface in order to receive incoming and modem calls.
The PRI network modules and interface cards for your router can have either one or two ports; therefore
you might have multiple D-channels to configure.
To configure the ISDN D-channel serial interface for E1 or T1 controllers, perform the following tasks,
beginning in global configuration mode:
SUMMARY STEPS
1. interface Serial slot/port:channel
2. no ip address
3. encapsulation ppp
4. isdn incoming-voice modem
5. no fair-queue
6. no cdp enable
Command or Action Purpose
Step 1 isdn switch-type switch-type
Example:
Router(config)# isdn switch-type primary-qsig
Specifies the central office switch type on the ISDN
interface.
See the Cisco IOS Release 12.4 Master Commands List for
a complete listing of supported signaling methods.
Step 2 pri-group timeslots timeslot-range
Example:
Router(config)# pri-group timeslots 1-24
Specifies an ISDN PRI group on a channelized T1 or E1
controller.
timeslot-range specifies the time slots that are included in
the PRI group. For T1 ports, time slots range from 1 to 24.
For E1 ports, time slots range from 1 to 31.

Cisco PVDM2-12DM, PVDM2-24DM, and PVDM2-36DM Digital Modem Packet Voice Data Modules
How to Configure Digital Modem PVDM2s
18
Cisco IOS Release 12.4(9)T, 12.4(11)XW, and 12.4(20)T
DETAILED STEPS
Configuring Digital Trunk Calls (CAS)
Perform the following step to complete the configuration of digital modem PVDM2s for CAS digital
trunk calls.
SUMMARY STEPS
1. ds0-group group-number timeslots list type type
Command or Action Purpose
Step 1 interface Serial slot/port:channel
Example:
Router(config)# interface Serial 1/0:23
Specifies the D-channel of the first PRI line and switch to
the interface configuration mode.
•For E1 controllers, channel = 15
•For T1 controllers, channel = 23
Step 2 no ip address
Example:
Router(config-if)# no ip address
Disables IP processing on this 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 isdn incoming-voice modem
Example:
Router(config-if)# isdn incoming-voice modem
Configures all incoming voice calls to go to the modems.
Step 5 no fair-queue
Example:
Router(config-if)# no fair-queue
Disables fair weighted queuing for this interface.
Step 6 no cdp enable
Example:
Router(config-if)# no cdp enable
Disables Cisco Discovery Protocol on this interface.

Cisco PVDM2-12DM, PVDM2-24DM, and PVDM2-36DM Digital Modem Packet Voice Data Modules
How to Configure Digital Modem PVDM2s
19
Cisco IOS Release 12.4(9)T, 12.4(11)XW, and 12.4(20)T
DETAILED STEPS
Configuration Using HWIC-xCE1T1-PRI
To configure T1/E1HWICs for PRI operation, perform the following tasks:
SUMMARY STEPS
1. network-clock-participate [slot slot-number | wic wic-slot]
2. controller {t1 | e1} slot/subslot/port
3. framing {sf | esf}
or
framing {crc4 | no-crc4}
4. linecode {ami | b8zs}
or
linecode {ami | hdb3}
5. pri-group timeslot-range
DETAILED STEPS
Command or Action Purpose
Step 1 ds0-group group-number timeslots list type type
Example:
Router(config)# ds0-group 1 timeslots 1-24 type
e&m-immediate-start
Specifies the DS0 time slots that make up a port.
list specifies the time slots that are included in the DS0
group. For T1 ports, time slots range from 1 to 24. For E1
ports, time slots range from 1 to 31.
Refer to Cisco IOS Release 12.4 Master Commands List for
a complete listing of supported signaling methods.
Command or Action Purpose
Step 1 network-clock-participate [slot slot-number |
wic wic-slot]
Example:
Router(config)# network-clock-participate wic 0
TDM group configuration only. Allows the ports on a
specified network module or interface card to use the
network clock for timing.
Step 2 controller {t1 | e1} slot/subslot/port
Example:
Router(config)# controller t1 1/0
Enters controller configuration mode.

Cisco PVDM2-12DM, PVDM2-24DM, and PVDM2-36DM Digital Modem Packet Voice Data Modules
How to Configure Digital Modem PVDM2s
20
Cisco IOS Release 12.4(9)T, 12.4(11)XW, and 12.4(20)T
Configuration Using VIC2-2BRI-NT/TE
To configure VIC2-2BRI VICs for BRI operation, perform the following steps.
SUMMARY STEPS
1. configure terminal
2. isdn switch-type {basic-net3 | basic-qsig}
3. interface bri <slot/port>
4. no ip address
5. end
Step 3 framing {sf | esf}
or
framing {crc4 | no-crc4}
Example:
Router(config-controller)# framing esf
In T1 configurations, specifies super frame (sf) or extended
super frame (esf) as the frame type for data lines. Default is
esf.
In E1 configurations, specifies cyclic. redundancy check 4
(crc4) or no-crc4 as the frame type for data lines. Default is
crc4.
Step 4 linecode {ami | b8zs}
or
linecode {ami | hdb3}
Example:
Router(config-controller)# linecode b8zs
In T1 configurations, specifies alternate mark inversion
(AMI) or b8zs as the linecode. Default is b8zs.
In E1 configurations, specifies AMI or high-density
bipolar 3 (hdb3) as the linecode. Default is hdb3.
Step 5 pri-group timeslot-range
Example:
Router(config-controller)# pri-group timeslots
1-24
Configures specified timeslots on T1 or E1 interfaces for
PRI for transporting ISDN data.
Command or Action Purpose