All ISDN connections were based on what two different types of channels?
What will be an ideal response?
ANSWER: ISDN connections were based on the following two types of channels:
* B channel-"Bearer" channel, employing circuit-switching techniques to carry voice, video, audio, and other types of data over the ISDN connection. A single B channel had a maximum throughput of 64 Kbps. The number of B channels in a single ISDN connection could vary.
* D channel-"Data" channel, employing packet-switching techniques to carry information about the connection, such as session initiation and termination signals, caller identity, call forwarding, and conference calling signals. A single D channel had a maximum throughput of 16 or 64 Kbps, depending on the type of ISDN connection. Each ISDN connection used only one D channel.
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Describe caching servers.
What will be an ideal response?