Which of the following support speeds of 1.5 Mbps?

  1. ISDN

  2. DSL

  3. USR

  4. ATM

  5. T1


Correct Option: E

AI Explanation

To answer this question, you need to understand the different types of network technologies and their corresponding speeds.

Let's go through each option to understand why it is correct or incorrect:

Option A) ISDN - Integrated Services Digital Network (ISDN) is a set of communication standards that enables digital transmission of voice, video, and data over traditional telephone lines. The maximum speed supported by ISDN is 128 Kbps, which is lower than 1.5 Mbps. Therefore, Option A is incorrect.

Option B) DSL - Digital Subscriber Line (DSL) is a technology that provides high-speed internet access over traditional telephone lines. While DSL can support speeds higher than 1.5 Mbps, it can also support lower speeds depending on the specific DSL variant and the distance from the DSL provider's central office. Therefore, Option B may or may not support speeds of 1.5 Mbps, so it is not the correct answer.

Option C) USR - USR (U.S. Robotics) is a brand that produces modems and networking equipment. However, the specific technology or product associated with "USR" is not provided in the question. Without knowing the specific context, it is not possible to determine whether USR supports speeds of 1.5 Mbps. Therefore, Option C cannot be determined as the correct answer.

Option D) ATM - Asynchronous Transfer Mode (ATM) is a networking technology that transmits data in fixed-size cells. ATM can support various speeds, including 1.5 Mbps. Therefore, Option D is a possible correct answer.

Option E) T1 - T1 is a dedicated digital communication line that supports a data rate of 1.544 Mbps. This speed is higher than 1.5 Mbps. Therefore, Option E is the correct answer.

The correct answer is Option E) T1. This option is correct because T1 supports speeds higher than 1.5 Mbps.

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