The document discusses Integrated Services Digital Network (ISDN), which is a set of communication standards that allows digital transmission of voice, video and data over existing telephone infrastructure. It provides higher bandwidth than analog networks and allows multiple services like voice and data to be used simultaneously. The key components of ISDN include Basic Rate Interface (BRI) and Primary Rate Interface (PRI) which define different channel configurations for connectivity to user sites.

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Chapter 16
Integrated
Services
Digital Network
(ISDN)

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Figure 16-1
ISDN Services

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Figure 16-2
Voice Communication over an
Analog Telephone Network

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Figure 16-3
Voice and Data Communication
over an Analog Telephone Network

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Figure 16-4
Analog and Digital Services
over the Telephone Network

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Figure 16-5
IDN

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Figure 16-6
ISDN

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Figure 16-7
BRI

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Figure 16-8
PRI

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Figure 16-9
Functional Grouping

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Figure 16-10
Reference Points

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Figure 16-11
ISDN Layers

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Figure 16-12
Simplified Layers of ISDN

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Figure 16-13
BRI Interfaces

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Figure 16-14
S Interface

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Figure 16-15
2B/1Q Encoding

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Figure 16-16
BRI Frame

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Figure 16-17
BRI
Topology

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Figure 16-18
PRI Interfaces

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Figure 16-19
PRI Frame

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Figure 16-20
LAPD Address Field

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Figure 16-21
Network Layer Packet Format

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Figure 16-22
Call Reference Field

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Figure 16-23
Information Elements

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Figure 16-24
Information Element Types

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Figure 16-25
Addressing in ISDN

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Figure 16-26
Bit Rates for Different Applications

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Figure 16-27
B-ISDN Services

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Figure 16-28
B-ISDN Accesses