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Integrated Services Digital Network (ISDN) - UTP-3 carrier
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Two standard interfaces: Basic Rate Interface (BRI) and Primary Rate Interface (PRI), symmetric bandwidth.
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BRI: 2 B channels (64 kbps each) + 1 D channel (16 kbps), full duplex
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PRI: 23 (30 in Europe) B channels + 1 D channel (64 kbps), full duplex. PRI also supports H channels: H0 - 384 kbps, H10 - 1472 kbps etc.
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D channel used for out-of-band control.
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Inverse multiplexing is a standard feature of ISDN - flexible bandwidth provisioning.
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Both circuit mode and packet mode are supported.
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IP support via Point-to-Point (PPP) protocol or via proprietary solutions.
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BRI service at best marginal for video; sufficient for teleconferencing using H.261 or H.263 protocols.
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MPEG-4 (whatever it will be) will probably provide an acceptable solution for video over ISDN lines.
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