14-08-2012, 09:43 AM
B-ISDN
[attachment=31355]
OVERVIEW
BISDN is an extension of ISDN in terms of
capabilities, i.e. it not only has the narrowband
capability of ISDN but also the broadband
capability.
B-ISDN
Definition
“A service requiring transmission channels
capable of supporting rates greater than the
primary rate.” ITU-T.
Any service inquiry with a speed greater than
1.544 Mbps is defined as broadband, and any
communications based on this speed are called
broadband communications.
BISDN is an extension of ISDN only in term
of the name. Everything is different including
protocol, architecture, transmission, and
switching technology.
The Goal of BISDN is to achieve complete
integration of services, ranging from low-bit-
-rate bursty signals to high-bit-rate continuous
real-time signals.
B-ISDN
• Designed to exploit the advances in technology.
• Provides for integration of wide range of
communications facilities and the support of
universal communications with the following
characteristics.
3Worldwide exchange between any two subscribers in any
medium.
3Retrieval and sharing of information from multiple
sources, in multiple media.
3Distribution of a wide variety of materials to home or
office, on demand.
Interactive Services
Conversational Services
Messaging Services
Retrieval Services
Distribution Services
Without user individual presentation
control (broadcast service)
With user individual control
B-ISDN Services
• Interactive Services
3Two-way exchange of information (other than controlsignaling
information) between two subscribers or
between a subscriber and a service provider.
• Distribution Services
3Primarily one way transfer of information, from
service provider to B-ISDN subscriber.
B-ISDN Services
Distribution Services Without User
Presentation Control
3Referred also as broadcast services
3Provide a continuos flow of information, which is
distributed from a central source to an unlimited
number of authorized receivers connected to the
network.
3User can access this flow of information but has no
control over it.
3Example: High definition television (HDTV)
B-ISDN Services
Distribution Services With User
Presentation Control
3Distribute information from a central source to a large
number of users.
3Information is provided as a sequence of information
entities (e.g. , frames) with cyclical repetition.
3User has the ability of individual access to the cyclical
distributed information and can control start and order
of presentation.
3Example: cable text
Services include voice-band services such as
telemetry, low-speed data, telephone, and
facsimile and broadband services, such as highquality
video conferencing, high-definition
television (HDTV) video transmission and high
speed data transmission.
Thus BISDN must adapt the characteristics of each
of the different services and integrate them into a
common transmission and switching platform.
For instance, the packet switching concept is
used for data-transmission and the circuit
switching concept is used for voice transmission.
In BISDN both these concepts are used so that both
type of traffic can be handled.
[attachment=31355]
OVERVIEW
BISDN is an extension of ISDN in terms of
capabilities, i.e. it not only has the narrowband
capability of ISDN but also the broadband
capability.
B-ISDN
Definition
“A service requiring transmission channels
capable of supporting rates greater than the
primary rate.” ITU-T.
Any service inquiry with a speed greater than
1.544 Mbps is defined as broadband, and any
communications based on this speed are called
broadband communications.
BISDN is an extension of ISDN only in term
of the name. Everything is different including
protocol, architecture, transmission, and
switching technology.
The Goal of BISDN is to achieve complete
integration of services, ranging from low-bit-
-rate bursty signals to high-bit-rate continuous
real-time signals.
B-ISDN
• Designed to exploit the advances in technology.
• Provides for integration of wide range of
communications facilities and the support of
universal communications with the following
characteristics.
3Worldwide exchange between any two subscribers in any
medium.
3Retrieval and sharing of information from multiple
sources, in multiple media.
3Distribution of a wide variety of materials to home or
office, on demand.
Interactive Services
Conversational Services
Messaging Services
Retrieval Services
Distribution Services
Without user individual presentation
control (broadcast service)
With user individual control
B-ISDN Services
• Interactive Services
3Two-way exchange of information (other than controlsignaling
information) between two subscribers or
between a subscriber and a service provider.
• Distribution Services
3Primarily one way transfer of information, from
service provider to B-ISDN subscriber.
B-ISDN Services
Distribution Services Without User
Presentation Control
3Referred also as broadcast services
3Provide a continuos flow of information, which is
distributed from a central source to an unlimited
number of authorized receivers connected to the
network.
3User can access this flow of information but has no
control over it.
3Example: High definition television (HDTV)
B-ISDN Services
Distribution Services With User
Presentation Control
3Distribute information from a central source to a large
number of users.
3Information is provided as a sequence of information
entities (e.g. , frames) with cyclical repetition.
3User has the ability of individual access to the cyclical
distributed information and can control start and order
of presentation.
3Example: cable text
Services include voice-band services such as
telemetry, low-speed data, telephone, and
facsimile and broadband services, such as highquality
video conferencing, high-definition
television (HDTV) video transmission and high
speed data transmission.
Thus BISDN must adapt the characteristics of each
of the different services and integrate them into a
common transmission and switching platform.
For instance, the packet switching concept is
used for data-transmission and the circuit
switching concept is used for voice transmission.
In BISDN both these concepts are used so that both
type of traffic can be handled.