公开(公告)号：EP0749663A1

公开(公告)日：1996-12-27

申请号：EP95911122.0

申请日：1995-02-28

申请人： EXCEL, INC.

发明人： MADONNA, Robert, P. ,  ESCHHOLZ, Siegmar, K. ,  LYNCH, John, T.

IPC分类号： H04M3 ,  G06F13 ,  H04Q3 ,  H04Q11 ,  H04J3 ,  H04M7

CPC分类号： G06F13/4063 ,  H04J3/14 ,  H04J3/1623 ,  H04M3/12 ,  H04M7/0096 ,  H04Q3/625 ,  H04Q11/04 ,  H04Q11/0414 ,  H04Q2201/12 ,  H04Q2213/13003 ,  H04Q2213/13031 ,  H04Q2213/1308 ,  H04Q2213/13106 ,  H04Q2213/13107 ,  H04Q2213/13292 ,  H04Q2213/13299 ,  H04Q2213/13396

摘要： A programmable telecommunications switch has automatic backup of line cards to provide complete redundancy. The switch has I/O cards which terminate the external telecommunications spans. Each I/O card passes the data from its spans to a line card. When the line card fails, the I/O card switches the data onto an I/O bus which is connected to a standby I/O card. The standby I/O card switches a standby line card into connection with the I/O bus such that the data stream is then serviced by the standby line card. The failed line card may then be removed and replaced. All I/O cards are attached to the I/O bus such that redundancy for all active line cards using the same signalling protocol is provided with a single standby line card. With multiple I/O busses, standby I/O cards and standby line cards, multiple redundancy is possible. Finally, the failure of a single line module of a line card may be handled by switching only the span serviced by that module to a standby line card. Spans from different I/O cards may be serviced by different line modules of a single standby line card, and may be all connected to the same standby line card by the same bus.