Integrated Services Digital Network Isdn — Test 1

Correct Answer: A. A. Integrated services digital network
Explanation: ISDN stands for integrated services digital network. It defines the dedicated signalling network that has been created to complement the PSTN for more flexible and efficient network access and signalling.

Correct Answer: B. B. Ccs
Explanation: ISDN is a complete network framework designed around the concept of common channel signalling. While telephone users throughout the world rely on the PSTN to carry conventional voice traffic, new end-user data and signalling services can be provided with a parallel, dedicated signalling network.

Correct Answer: C. C. Access signalling
Explanation: Access signalling supports traffic between the end user and the network. It defines how end users obtain access to the PSTN and the ISDN for communication or services.

Correct Answer: B. B. False
Explanation: The second signalling component of ISDN, network signalling is governed by the SS7 suite of protocols. For wireless communication systems, the SS7 protocols within ISDN are critical to providing backbone network connectivity between MSCs throughout the world.

Correct Answer: C. C. B channels
Explanation: The ISDN interface is divided into three different types of channels. Information bearing channels called bearer channels (B channels) are used exclusively for end user traffic (voice, data and video).

Correct Answer: B. B. False
Explanation: ISDN provides integrated end-user access to both circuit switched and packet switched networks with digital end-to-end connectivity.

Correct Answer: B. B. False
Explanation: ISDN end users may select between two different interfaces. The BRI (basic rate interface) is intended to serve small capacity terminals while the PRI (primary rate interface) is intended for large capacity terminals.

Correct Answer: D. D. B-isdn
Explanation: Emerging networking technique, broadband ISDN (B-ISDN) is based on asynchronous transfer mode (ATM) technology. It allows packet switching rates up to 2.4 Gbps and total switching capacities as high as 100 Gbps.

Correct Answer: C. C. Multiplexing technique
Explanation: ATM is a packet switching and multiplexing technique which has been specifically designed to handle both voice users and packet data users in a single physical channel.

Correct Answer: B. B. False
Explanation: ATM supports bidirectional transfer of data packets of fixed length between two end points. It preserves the order of transmission.