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Difference b/w narrowband and broadband isdn

1.The narrowband ISDN is based on the use of a 64 kbps channel as the basicunit of switching and has a circuit switching orientation. The major technical

contribution of the narrowband ISDN effort has beenframe relay. The B-ISDN supports very high data rates (100s of Mbps) and has apacket switching orientation. The major technical contribution of the B-ISDNeffort has been asynchronous transfer mode, also known as cell relay

2.Generally, narrowband describes telecommunication that carries voiceinformation in a narrow band of frequencies. More specifically, the term has beenused to describe a specific frequency range set aside by the U.S. FCC for mobile orradio services, including paging systems, from 50 cps to 64 Kbps

On the other hand, broadband refers to telecommunication in which a wide bandof frequencies is available to transmit information. Because a wide band offrequencies is available, information can be multiplexed and sent on manydifferent frequencies or channels within the band concurrently, allowing moreinformation to be transmitted in a given amount of time (much as more lanes ona highway allow more cars to travel on it at the same time)The most important development in the computer communications industry in the 1990s is

the evolution of the integrated services digital network (ISDN) and broadband ISDN (B-ISDN). The ISDN and B-ISDN have had a dramatic impact on the planning and

deployment of intelligent digital networks providing integrated services for voice, data and

video. Further, the work on the ISDN and B-ISDN standards has led to the development of

two major new networking technologies; frame relay and asynchronous transfer mode(ATM). Frame relay and ATM have become the essential ingredients in developing high-

speed networks for local, metropolitan and wider area applications.

The ISDN is intended to be a worldwide public telecommunications network to replaceexisting public telecommunication networks and deliver a wide variety of services. The

ISDN is defined by the standardization of user interfaces and implemented as a set of

digital switches and paths supporting a broad range of traffic types and providing valueadded processing services. In practice, there are multiple networks, implemented within

national boundaries but from the user's point of view, the eventual widespread deployment

of ISDN will lead to a single, uniformly accessible, worldwide network.

The narrowband ISDN is based on the use of a 64 kbps channel as the basic unit of

switching and has a circuit switching orientation. The major technical contribution of thenarrowband ISDN effort has been frame relay. The B-ISDN supports very high data rates

(100s of Mbps) and has a packet switching orientation. The major technical contribution ofthe B-ISDN effort has been asynchronous transfer mode, also known as cell relay.

CIRCUIT SWITCHING

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_band_ISDN#ixzz1o8Yu5CEU

Broadband Versus Narrowband

We frequently regard a broadband network as a "high speed connection" to the Internet runover Ethernet network interface cards (NICs). This is not a correct point of view. We mustdifferentiate between broadband and narrowband networks in that broadband networks can

be used for many different traffic characteristics, while narrowband networks are used for

one. Broadband and narrowband networks have nothing to do with the capacity ofasymmetrical digital subscribe line (ADSL) or cable modems. These are access points to a

broadband network.

Narrowband technologies are Ethernet, Token Ring, FDDI, and certain types of WAN

links. Narrowband technologies can be adapted to run over broadband technologies, but itis not possible to run broadband technologies over narrowband. Broadband technologies,

on the other hand, are not limited to a single link protocol (like Ethernet) or to datacommunication only. Broadband networks use frame, or frame trains, and special methodsto encapsulate and control the information sent through it. The information does not have

to be computer related at all. For example, voice -over-IP is not a broadband technology

because the audio is digitized and sent as IP packets, mostly over Ethernet, whereas onbroadband, voice can be sent as a separate channel without encapsulating it into a computer

communication protocol.

The three major types of broadband communication are:

Constant bit rate (time critical)typically video streams

Available bit rate (in-order packet delivery)typically phone systems Unspecified bit rate (error-free)typically data communications

Broadband networks can be adapted to form the physical layer for LAN technologies

(broadband ISDN or ATM), or to run subsets of TCP/IP directly (such as PPP over SDH).

The three major groups of broadband technologies are:

Synchronous optical network (SONET, North America)

Synchronous digital hierarchy (SDH, Europe)

Broadband ISDN (ATM)

ATM can function by itself or run over SONET or SDH. The latter is more common.

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