CCNA 4 v3.0 Module 4
ISDN and DDR
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Purpose of This PowerPoint
• This PowerPoint primarily consists of the Target
Indicators (TIs) of this module in CCNA version
3.0.
• It was created to give instructors a PowerPoint to
take and modify as their own.
• This PowerPoint is:
NOT a study guide for the module final assessment.
NOT a study guide for the CCNA certification exam.
• Please report any mistakes you find in this
PowerPoint by using the Academy Connection
Help link.
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To Locate Instructional Resource
Materials on Academy Connection:
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materials created by the instructor community
• Go to the Tools section
• Go to the Alpha Preview section
• Go to the Community link under Resources
• See the resources available on the Class home
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• Search http://www.cisco.com
• Contact your parent academy!
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Objectives
• ISDN concepts
• ISDN configuration
• DDR configuration
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Digital Communication with ISDN
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ISDN Benefits
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ISDN Standards
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ISDN Access Options
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ISDN 3-Layer Model
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Q.931 Messaging-Call Setup Example
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Call Processing
1.
The D channel is used to send the called number to the
local ISDN switch.
2.
The local switch uses the SS7 signaling protocol to set
up a path and pass the called number to the remote
ISDN switch.
3.
The remote ISDN switch signals the destination over the
D channel.
4.
The destination ISDN NT-1 device sends the remote
ISDN switch a call-connect message.
5.
The remote ISDN switch uses SS7 to send a callconnect message to the local switch.
6.
The local ISDN switch connects one B channel end-toend, leaving the other B channel available for a new
conversation or data transfer. Both B channels can be
used simultaneously.
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ISDN Functions and Reference Points
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ISDN Functions and Reference Points
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BRI Reference Points
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Cisco ISDN BRI Interfaces
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ISDN Interfaces
S/T ISDN Interface
U ISDN Interface
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ISDN Switch Types
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Configuring ISDN BRI
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Configuring ISDN BRI
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Configuring ISDN PRI
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Switch Types Available for ISDN PRI
Configuration
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ISDN PRI Examples
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Verifying ISDN Configuration
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Troubleshooting ISDN Configuration
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DDR Operation
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DDR Operation
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Configuring Legacy DDR
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Defining Static Routes
• When configuring static routes, consider
the following:
By default, a static route will take precedence
over a dynamic route because of its lower
administrative distance. Without additional
configuration, a dynamic route to a network
will be ignored if a static route is present in the
routing table for the same network.
To reduce the number of static route entries,
define a summarized or default static route
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Specifying Interesting Traffic
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Configuring Dialer Information - PPP
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The dialer-group Command
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The dialer-map Command
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The dialer idle-timeout
Command
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Dialer Profiles Overview
• Define encapsulation and access control lists
• Determine minimum or maximum calls
• Turn features on or off
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Dialer Profile Elements
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Configuring Dialer Interfaces
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Verifying DDR
• show dialer
• show dialer interface [BRI]
• show isdn active
• show isdn status
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Troubleshooting DDR
• debug isdn q921
• debug isdn q931
• debug dialer [events|packets]
• isdn call interface
• clear interface bri
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