专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明专利

JPS6223651A DATA TRANSMISSION EQUIPMENT 失效
公开(公告)号：JPS6223651A
公开(公告)日：1987-01-31
申请号：JP16456085
申请日：1985-07-24
申请人： NEC CORP , NIPPON STEEL CORP
发明人： HASEGAWA YOSHIHIKO , MAEDA MASAHIRO , ANDO NOBORU
摘要： PURPOSE:To automate terminal connection changeover by allowing a data transmitter to identify whether the system is the operating system or the standby system based on an ER signal of the CCITT recommendations from a terminal device and inserting a data signal of the terminal device selected by the result of identification into a loop data transmission line. CONSTITUTION:An input signal (a) from the loop data transmission line 30 is outputted to a terminal device 20 via a reception circuit 1 as an output signal (b) and becomes an output signal (f) to the loop data transmission line 30 via a data insertion circuit 5. An input signal (c) from the terminal device 20 is stored at first in a transmission circuit 2, and a timing signal (e) from the control circuit 3 is outputted to the data insertion circuit 5 via a AND circuit 4 when the timing signal (e) from the control circuit 3 is logical 1 at a prescribed time slot and a data terminal ready signal (d) is inputted from the terminal device 20 with a level of logical 1. An output signal of the transmission circuit 2 is selected by the data insertion circuit 5 succeedingly and the input signal (c) from the terminal device 20 is outputted from the transmission circuit 2 to the loop data transmission circuit 30.

2. 发明专利

JPS6223652A DATA TRANSMISSION SYSTEM 失效
公开(公告)号：JPS6223652A
公开(公告)日：1987-01-31
申请号：JP16456185
申请日：1985-07-24
申请人： NEC CORP , NIPPON STEEL CORP
发明人： HASEGAWA YOSHIHIKO , MAEDA MASAHIRO , ANDO NOBORU , CHIKASAWA SUSUMU
IPC分类号： H04L12/437
摘要： PURPOSE:To eliminate a data transmission equipment having a fault without stopping once a data transmission line from a system by providing the transmission line of duplicated constitution as the transmission line and the 1st switch circuit and the 2nd switch circuit interlocked together as a connection means. CONSTITUTION:Two switch circuits 2a, 2b and the switch circuit 2a has connection terminals (a, b) to the data transmitter side and connection terminals (e, f) to the loop transmission side. The connection terminal (a) is connected to the connection terminal (e) and the connection terminal (b) is connected to the connection terminal (f) respectively in the switch circuit 2a and a connection terminal (c) is connected to a connection terminal (g) and a connection terminal (d) is connected to a connection terminal (h) respectively in the switch circuit 1b. In the 2nd connection state as above, the data transmitter 1a is connected to the loop transmission line 4, on the other hand, the data transmitter 1b is connected to the loop transmission line 3. The path representing the connection state is a path shown in one-dashed chain lines. That is, the connection between the data transmitters 1a, 1b and the loop transmission lines 3, 4 is replaced depending on the connection state.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式