Final answer:
ISDN BRI combines two Bearer channels (64 Kbps each) for data and voice transmission with one D-channel (16 Kbps) for signaling, providing a total bandwidth of 144 Kbps.
Correct option is
b. two
Step-by-step explanation:
The Integrated Services Digital Network (ISDN) Basic Rate Interface (BRI) is a telecommunications standard that enables the transmission of voice, data, and other services over a digital network. At its core, BRI multiplexes two separate channels, forming a comprehensive and versatile communication system. These channels include two Bearer (B) channels, designated for data transmission, and one Delta (D) channel, which serves the critical role of managing control and signaling functions.
Each Bearer channel within the ISDN BRI framework typically operates at a capacity of 64 Kbps, effectively providing a total of 128 Kbps for data and voice communication. These B channels facilitate the concurrent transmission of diverse information types, such as voice calls and digital data, optimizing the efficiency and versatility of the ISDN BRI service.