Subscriber Access to the ISDN

To allow flexibility, digital pipes between customers and the ISDN office (the subscriber loops) are organized into multiple channels of different sizes. The ISDN standard defines three channel types, each with a different transmission rate: bearer channels, data channels, and hybrid channels (see Table 10.3-1).

Table 10.3-1 Channel rates


Data rate (bit/s)

Bearer (B) Data (D) Hybrid (H)

64 16, 64 384, 1536, 1920

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