Физический канал стандарт на цифровой канал речевой связи со скоростью передачи 64 кбитс
One of the 64kbps communications channels that carry data on an isdn circuit. a bri (basic rate interface) isdn line has two b channels and one d (data) channel. a pri (primary rate interface) isdn line has 23 b channels (in north america) or 30 b channels (in europe) and one d channel. beat (n)