A single PRI can deliver multiple voice calls simultaneously using Layer 1 technologies such as Time Division Multiplexing (TDM). Learn more about PRI and its capabilities.

A single PRI can deliver multiple voice calls simultaneously using which of the following Layer 1 technologies?

A.

Time division multiplexing

B.

Analog circuit switching

C.

CSMA/CD

D.

Time division spread spectrum.

A.

The correct answer is A. Time division multiplexing.

A PRI (Primary Rate Interface) is a type of digital telephony service that uses T1 or E1 transmission lines. T1 lines have a data rate of 1.544 Mbps and can support up to 23 voice channels, while E1 lines have a data rate of 2.048 Mbps and can support up to 30 voice channels.

Time division multiplexing (TDM) is a Layer 1 technology that allows multiple signals to share a single communication channel by dividing the channel into multiple time slots. Each time slot is assigned to a different signal, and the signals take turns transmitting their data during their assigned time slots. This allows multiple signals to be transmitted simultaneously over the same channel without interfering with each other.

In the case of a PRI, each voice call is assigned a time slot on the T1 or E1 transmission line, allowing multiple calls to be transmitted simultaneously over the same line. The TDM technology ensures that each call is transmitted without interference from other calls.

Analog circuit switching (B) is a technology that was used in older telephone systems to establish a dedicated circuit between two parties for the duration of a call. This technology is not used in digital telephony systems like PRI.

CSMA/CD (C) is a Layer 2 technology used in Ethernet networks to control access to the network medium and prevent collisions between frames. This technology is not used in digital telephony systems like PRI.

Time division spread spectrum (D) is a wireless communication technology that uses a wide frequency band and divides it into multiple narrow frequency channels that are used simultaneously. This technology is not used in digital telephony systems like PRI.