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ISDN integrates data, voice, and video signals into a digital telephone line
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| 2 |
Specification:
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CCITT in 1984 (spec I.100-400), 1988 (I.500-600) ; 96 basic specifications
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Physical I.430/431 basic/primary interface
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Logical Link I.441/Q.921 Link Access Protocol D channel (LAPD)
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Network I.451/Q.931 control signaling, call control
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| 3 |
Narrow-band ISDN (N-ISDN)- original standard operates over copper cable (operates on physical,logical and network layers)
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| 4 |
BRI = Basic Rate Interface (2B+D=144 Kbps)
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B = 64 Kbps, B (bearer) - data transmission channel
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D = 16 Kbps, D (delta) - Signaling (2 modes: 64 Kbps and 56Kbps)
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| 5 |
PRI = Primary Rate Interface (23B+D=1.544 Mbps) in Europe 30B+D (D = 64 Kbps, signaling channel)
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