The unique feature of combining B channel is referred to as?
Answers
B channel (bearer) is a telecommunications term which refers to the ISDN channel in which the primary data or voice communication is carried.
Multi-link PPP and the Bandwidth Allocation Protocol (BAP) lay the groundwork for combining incoming ISDN calls, but they fall short of linking separate B channel calls that get answered by two different devices. In a large network with many relatively small capacity concentrators (120 ports or less), the probability of being able to make the second connection on the same concentrator is problematic.
While the industry awaits a standard for multi-chassis multi-linking, proprietary methods are beginning to emerge. Many vendors are using a developing IETF tunneling protocol, L2TP, to combine the calls regardless of where they originate, essentially creating a single, virtual machine.
L2TP, an IETF draft proposal for creating a tunnel between two devices, was mainly developed to address virtual private networking applications, yet remote access concentrators can use L2TP to provide a transparent means of connecting ISDN calls that come into different chassis located on the same LAN.