What is the B Channel?

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Core Definition

The B Channel, short for Bearer Channel, is a fundamental component within the Integrated Services Digital Network (ISDN) that carries the main voice or data traffic during a call or data session. It operates in full duplex mode, meaning information can flow in both directions simultaneously, at a speed of 64 kilobits per second (kbps).

Benefit Definition

The B Channel plays a vital role in enabling efficient voice and data communication over ISDN networks. By dedicating a channel for the call content itself, separate from signaling information, the B Channel ensures smooth transmission of voice or data without disruption. This allows for clear phone calls and reliable data transfer over ISDN lines.

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Technical Definition

In technical terms, the B Channel is a channel within the ISDN access interfaces, which are the connection points between user equipment and the network. These interfaces come in two main types: Basic Rate Interface (BRI) and Primary Rate Interface (PRI). A BRI offers up to two B channels, while a PRI provides a larger capacity with typically 23 B channels, enabling multiple simultaneous calls or data sessions.

This breakdown provides a comprehensive understanding of the B Channel, from its core function to its technical specifications and the benefits it offers in ISDN communication.

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