公开(公告)号：EP0553360B1

公开(公告)日：1999-02-03

申请号：EP92917819.2

申请日：1992-08-18

Applicant: FUJITSU LIMITED

Inventor： KOMURO, Yasuko, Fujitsu Limited ,  YAJIMA,Noboru, Fujitsu Limited ,  YOSHIDA, Hiroshi, Fujitsu Limited

IPC: H04L7/00 ,  H04L12/28 ,  H04Q11/04 ,  H04J3/06

CPC classification number: H04J3/0647 ,  H04J3/0641 ,  H04J2203/0042 ,  H04J2203/006 ,  H04J2203/0089 ,  H04Q11/0478

公开(公告)号：EP0553360A1

公开(公告)日：1993-08-04

申请号：EP92917819.2

申请日：1992-08-18

Applicant: FUJITSU LIMITED

Inventor： KOMURO, Yasuko, Fujitsu Limited ,  YAJIMA,Noboru, Fujitsu Limited ,  YOSHIDA, Hiroshi, Fujitsu Limited

IPC: H04L7/00 ,  H04L12/48 ,  H04Q11/04 ,  H04J3/06

CPC classification number: H04J3/0647 ,  H04J3/0641 ,  H04J2203/0042 ,  H04J2203/006 ,  H04J2203/0089 ,  H04Q11/0478

Abstract: A method of switching synchronous signal sources of a synchronous data communication network having offices (A B, C and D) connected to each other through circuits and synchronous signal sources installed inside and outside an office, in which even when a failure occurs in one of synchronizing signal sources, data communications are possible through switching the synchronizing signal sources to others according to the degree of the failure. Preset are flag bit data (S, *S), which indicate whether the synchronizing signal transmitted via the main wire is usable or not, in the signal including the synchronizing signal. When a failure occurs in one of the synchronizing signal sources, referring to the table specifying the priority order for selecting one synchronizing signal source, the table which is provided before-hand in every office, one synchronizing signal source is selected for every office according to the flag bit data. Then, in every office, the synchronizing signal source which has been selected at the present time is switched to a synchronizing signal source determined as mentioned above.

Abstract translation: 内和办公室外面安装的开关具有通过电路和同步信号源连接到海誓山盟办公室（AB，C和D）的同步数据通信网络的同步信号源的方法，其中，即使当一个故障在同步中的一个发生 信号源，数据通信是可能的，通过切换的同步信号源给他人gemäß该故障的程度。 预置是标志位数据（S，S *），所述指示符指示是否经由主线mitted同步信号反式是可用或不是，则在信号包括同步信号。 当故障中的同步信号源中的一个发生时，参照该表指定的优先顺序，用于选择一个同步信号源，表中的所有其前手在每个办公室提供一个同步信号源被选择用于每一个办公室雅丁到 该标志位的数据。 然后，在每一个办公室，其在当前时刻被选择的同步信号源被切换到同步信号源确定性开采如上所述。