| 单词 | PRA (Primary Rate Access) |
| 释义 | PRA (Primary Rate Access) The user interface to an integrated services digital network (ISDN) intended for large business applications in European countries and elsewhere outside of North America and Japan. Also known as 30B+D, PRA offers 30 bearer (B) channels for user payload, plus one data (D) 74570c16.qxd 9/11/07 12:27 PM Page 389 |
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