What bandwidth is used in special leased lines to connect midrange computers and mainframes as well as to transmit data over long distances?

The bandwidth used in special leased lines to connect midrange computers and mainframes, as well as to transmit data over long distances, is typically T1 or T3.

Here are the steps to understand this:

1. Special leased lines: These are reserved circuits within the network of a service provider that are rented out for a monthly or annual fee. They are used for internet, telephone, and other data communication needs.

2. Midrange computers and mainframes: Midrange computers are a category of computers that are more powerful and have more capacity than personal computers but are less powerful than mainframe computers. Mainframes are large, high-powered computers that are used for critical applications, bulk data processing such as census, industry and consumer statistics, and transaction processing.

3. Bandwidth: In digital communication, bandwidth is the data transfer rate or the amount of data that can be carried from one point to another in a given time period.

4. T1 and T3 lines: T1 and T3 are two types of leased lines that are used for connecting networks across distant locations. T1 lines offer a bandwidth of approximately 1.544 megabits per second (Mbps), while T3 lines provide a bandwidth of approximately 44.736 Mbps.

So, to answer your question, T1 or T3 bandwidths are used in special leased lines to connect midrange computers and mainframes and to transmit data over long distances.