Lecture 6 ISDN 2 nd semester 1439 1438

Lecture 6: ISDN 2 nd semester 1439 -1438 By: Adal ALashban 1

Created By Dr. Najla Al. Nabhan edited by Maysoon Al. Duwais 2

Created By Dr. Najla Al. Nabhan edited by Maysoon Al. Duwais 3

What is ISDN § ISDN -Integrated Services Digital Network. § It is an international standard for end to end digital transmission of voice, data and signaling. Created By Dr. Najla Al. Nabhan edited by Maysoon Al. Duwais 4

a local loop technology • ISDN is a local loop technology. • ISDN is deployed between the service provider's CO and the customer's premises • This means that from local central office (CO) to premises it is ISDN. However, on the other side of CO's switch, it can be just about anything, such as ATM or SONET/SDH. Created By Dr. Najla Al. Nabhan edited by Maysoon Al. Duwais 5

Created By Dr. Najla Al. Nabhan edited by Maysoon Al. Duwais 6

The ISDN Network • The building blocks of ISDN are Bearer channels (B channels) and Data channels (D channels). • The B channels are used for the transmission of customer video, voice, and data. • The D channel is used for call-control signaling. • There are some cases in which the D channel can be used for data applications. Created By Dr. Najla Al. Nabhan edited by Maysoon Al. Duwais 7

ISDN Channels § There are two types of channel that are found within ISDN. These are the 'B' and 'D' channels. § The B or 'bearer' channels are used to carry the payload data which may be voice and / or data § The d or 'Delta' channel is intended for signaling and control, although it may also be used for data under some circumstances. Created By Dr. Najla Al. Nabhan edited by Maysoon Al. Duwais 8

ISDN Access Options • There are two levels of ISDN access that may be provided. These are known as BRI and PRI Created By Dr. Najla Al. Nabhan edited by Maysoon Al. Duwais 9

Basic Rate Interface • BRI (Basic Rate Interface) - This consists of two B channels, each of which provides a bandwidth of 64 kbps under most circumstances. One D channel with a bandwidth of 16 kbps is also provided. • Together this configuration is often referred to as 2 B+D. • The basic rate lines connect to the network using a standard twisted pair of copper wires. • The data can then be transmitted simultaneously in both directions to provide full duplex operation Created By Dr. Najla Al. Nabhan edited by Maysoon Al. Duwais 10

Primary Rate Interface • PRI (Primary Rate Interface) - This configuration carries a greater number of channels than the Basic Rate Interface and has a D channel with a bandwidth of 64 kbps. • The number of B channels varies according to the location. Within Europe and Australia a configuration of 30 B+D has been adopted providing an aggregate data rate of 2. 048 Mbps (E 1). For North America and Japan, a configuration of 23 B+1 D has been adopted. This provides an aggregate data rate of 1. 544 Mbps (T 1). Created By Dr. Najla Al. Nabhan edited by Maysoon Al. Duwais 11

ISDN Usage • ISDN is in use around the world, but with the introduction of ADSL it is facing strong competition. • The technology never gained much market share in the USA, although it used in other countries. • It is used in many areas, particularly where existing services need to be maintained, or where compatibility needs to be guaranteed. Created By Dr. Najla Al. Nabhan edited by Maysoon Al. Duwais 12

Any Questions? 13