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ISDN: Integrated Services Digital Network - international telecommunications standard that enables a communications channel to carry digital data simultaneously with voice & video information. ISDN2e can achieve 128 Kbps.
| B-channel | aka bearer channel: single channel of ISDN that is used to carry either voice or data. ISDN Basic Rate Interface (BRI) has 2 B-channels. ISDN Primary Rate Interface (PRI) in North America has 23 B-channels. ISDN30e Primary Rate Interface (PRI) in Europe has 30 B-channels |
| D-channel | aka data channel: separate channel of ISDN used for ISDN signaling. For ISDN Basic Rate Interface (BRI), the D-channel is 16 kilobits per second (Kbps). For ISDN Primary Rate Interface (PRI), the D-channel is 64 Kbps |
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