| 单词 | BRI (Basic Rate Interface) |
| 释义 | BRI (Basic Rate Interface) The user interface to an integrated services digital network (ISDN) intended for residential and small business applications. Also known as basic rate access ( BRA) outside North America, BRI supports two bearer (B), or information-bearing, channels, each operating at the clear-channel rate of 64 kbps. Each B channel can support an independent data transmission, a PCM-encoded voice conversation, or a number of statistically multiplexed subrate (low-speed) data transmissions. The B channels also can be aggregated, or bonded, to provide up to 128 kbps to a given conversation, such as a videoconference or Internet session. BRI also provides a data (D) channel at 16 kbps, which is intended primarily for purposes of signaling and control, messaging, and network management. The D channel also generally is made available for packet data transmission and low-speed telemetry when not in use for 74570c02.qxd 9/11/07 12:18 PM Page 68 |
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