Integrated Service Digital Network

National Institute of Science & Technology

Integrated Service Digital Network

Integrated Service Digital Network

Instructor Mr. Dutikrushna Panda By Srikrushna Patro Roll # IT20017297 Srikrushna Patro

National Institute of Science & Technology

Integrated Service Digital Network

Integrated Service Digital Network ISDN Introduction ISDN Services ISDN Advantages ISDN Evolution ISDN Protocol Structure Typical ISDN Network Conclusion Srikrushna Patro

[1]

National Institute of Science & Technology

Integrated Service Digital Network

ISDN Introduction • Stands for Integrated Services Digital Network allows voice and data using endto-end digital connectivity . • Basic component is channel,it supports 3types of channels(B,D,H). • Kilo means 1000 not 1024.

Srikrushna Patro

[2]

National Institute of Science & Technology

Integrated Service Digital Network

ISDN Services • BRI and PRI services. • The ISDN Basic Rate Interface (BRI) service offers two B channels and one D channel , bit rate 192 kbps. • ISDN Primary Rate Interface (PRI) service offers 23 B channels and 1 D channel,bit rate in America 1.544 Mbps in Europe 2.048 Mbps Srikrushna Patro

[3]

National Institute of Science & Technology

Integrated Service Digital Network

ISDN Advantages • • • • •

Increased productivity and accessibility Two phone numbers on a single line Speed Multiple Devices Signaling

Srikrushna Patro

[4]

National Institute of Science & Technology

Integrated Service Digital Network

ISDN Evolution • • • • • • •

First the network was all-analogue and voice-centric Digital transmission (PDH) in the core network Digital switching at 64 obit/s SS7 replaces channel associated signaling systems SDH replaces PDH ISDN offers digital technology to end users DSL (primarily ADSL) technology takes over

Srikrushna Patro

[5]

National Institute of Science & Technology

Integrated Service Digital Network

ISDN Protocol Structure

Srikrushna Patro

[6]

National Institute of Science & Technology

Integrated Service Digital Network

ISDN Protocol Structure • Protocol discriminator - The protocol used to encode the remainder of the Layer. • Length of call reference value - Defines the length of the next field. • Flag - Set to zero for messages sent by the party that allocated the call reference value; otherwise set to one. • Call reference value - An arbitrary value that is allocated for the duration of the specific session, which identifies the call between the device maintaining the call and the ISDN switch. • Message type - Defines the primary purpose of the frame.

Srikrushna Patro

[7]

National Institute of Science & Technology

Integrated Service Digital Network

Typical ISDN Network

Srikrushna Patro

[8]

National Institute of Science & Technology

Integrated Service Digital Network

Conclusion • ISDN is replacing our old analog phones and offers a lot of new services. • Easy way to transmit voice and data simultaneously at the same time using advantages of a digital communication. • Due to its easy accessibility it is widely used.

Srikrushna Patro

[9]

National Institute of Science & Technology

Integrated Service Digital Network

THANK YOU Srikrushna Patro

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