ISDN Flashcards

Questions and Answers

What does ISDN stand for?

Integrated Services Digital Network

What is ISDN?

A set of communication standards for simultaneous digital transmission of voice, video, data, and other network services over traditional circuits.

What is a modem?

A modulator/demodulator that converts analog signals to digital signals and vice versa.

Is ISDN digital or analog?

True Signup and view all the answers

How many standards are there in ISDN?

3 Signup and view all the answers

What are the three ISDN standards?

E, I, Q Signup and view all the answers

What is the E series in the ISDN standards?

Existing telephone network/equipment Signup and view all the answers

What is the I series in the ISDN standards?

UNIs Signup and view all the answers

What is the Q series in the ISDN standards?

Switching and signaling Signup and view all the answers

What are the access options for ISDN?

BRI and PRI Signup and view all the answers

What does BRI stand for?

Basic Rate Interface Signup and view all the answers

What does PRI stand for?

Primary Rate Interface Signup and view all the answers

What are the two types of channels that ISDN is divided into?

B and D Signup and view all the answers

What do B channels carry?

Data Signup and view all the answers

What does the D channel carry?

Signaling protocols Signup and view all the answers

How many B channels does a T1 have?

23 Signup and view all the answers

What is the speed of the T1 D channel?

64 kbps Signup and view all the answers

How many B channels does a BRI have?

2 Signup and view all the answers

What is the speed of the BRI D channel?

16 kbps Signup and view all the answers

What is the L2 signaling protocol that runs over the D channel?

q.921 Signup and view all the answers

What is the L3 signaling protocol that runs over the D channel?

q.931 Signup and view all the answers

What does TA stand for?

Terminal adapter Signup and view all the answers

What does a TA do?

Adapts a non-ISDN device to an ISDN network Signup and view all the answers

What is the purpose of a NTI?

Converts between 2 wire and 4 wire ISDN circuit Signup and view all the answers

What does NT1 stand for?

Network termination 1 Signup and view all the answers

Where is the U reference point?

Between an NT1 and a wall jack Signup and view all the answers

Where is the S/T reference point?

Between an NT1 and an ISDN device Signup and view all the answers

Where is the R reference point?

Between a TA and a non-ISDN device Signup and view all the answers

What is a device that natively supports ISDN called?

TE1 Signup and view all the answers

What is a non-ISDN device called?

TE2 Signup and view all the answers

What does TE stand for?

Terminal endpoint Signup and view all the answers

Study Notes

Integrated Services Digital Network (ISDN) Overview

ISDN stands for Integrated Services Digital Network.
It comprises communication standards for simultaneous digital transmission of various data types (voice, video, data) over traditional public switched telephone network circuits.
Designed to facilitate end-to-end digital communication but has largely been replaced by DSL (Digital Subscriber Line).

Communication Components

A modem (Modulator-Demodulator) converts analog signals into digital signals for computers, acting as a translator between devices and the network.
ISDN operates on a digital basis, ensuring end-to-end digital transmission.

ISDN Standards

Three main ISDN standards exist: E, I, and Q series.
E series focuses on existing telephone network/equipment compatibility.
I series is related to User Network Interfaces (UNI).
Q series emphasizes switching and signaling protocols.

Access Options

ISDN access is categorized into two types: Basic Rate Interface (BRI) and Primary Rate Interface (PRI).
BRI includes two B channels and has a D channel speed of 16 kbps.
PRI consists of 23 B channels with a D channel speed of 64 kbps.

Channel Information

ISDN channels are divided into B channels and D channels.
B channels handle data transmission.
D channels manage signaling protocols.

Signaling Protocols

The Layer 2 (L2) signaling protocol for the D channel is Q.921.
The Layer 3 (L3) signaling protocol that operates over the D channel is Q.931.

Adapters and Termination

A terminal adapter (TA) connects non-ISDN devices to an ISDN network.
Network Termination 1 (NT1) helps convert between 2-wire and 4-wire ISDN circuits.

Reference Points

The U reference point is located between the NT1 and the wall jack.
The S/T reference point is situated between the NT1 and an ISDN device.
The R reference point is found between a TA and a non-ISDN device.

Device Types

Devices natively supporting ISDN are referred to as TE1 (Terminal Endpoint 1).
Non-ISDN devices are classified as TE2 (Terminal Endpoint 2).

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Description

This quiz covers key concepts related to Integrated Services Digital Network (ISDN). It includes definitions and explanations essential for understanding the communication standards involved in ISDN. Perfect for those studying telecommunications and networking.