公开(公告)号：US5497377A

公开(公告)日：1996-03-05

申请号：US220664

申请日：1994-03-31

申请人： Minoru Muto ,  Masanori Yamazi ,  Noriyuki Hattori

发明人： Minoru Muto ,  Masanori Yamazi ,  Noriyuki Hattori

IPC分类号： H04L1/24 ,  G06F11/00

CPC分类号： H04L1/24

摘要： A transmission system comprising a plurality of stations, each having transmission and receiving circuits, that are connected in a ring configuration and use a HDLC-type protocol for transmission. The fault of a transmission circuit in a station can be detected in an idle state time by transmitting a fixed bit pattern during an idle state of transmission. Each station has a fixed bit pattern generator for outputting a fixed bit pattern during an idle time. Each station also has fault detection means which detects a fault when it receives a signal other than transmission data and the fixed bit pattern. Since the state of a line can always be monitored, a fault of the line state can be rapidly identified. Since transmission data is not encoded, the data transmission can be conducted at a high speed.

摘要翻译： 一种传输系统，包括多个站，每个站具有传输和接收电路，其以环形配置连接并使用HDLC型协议进行传输。 通过在空闲状态下发送固定比特模式，可以在空闲状态下检测站内的发送电路的故障。 每个站具有用于在空闲时间期间输出固定位模式的固定位模式发生器。 每个站还具有故障检测装置，当接收到除了传输数据和固定位模式之外的信号时，它检测故障。 由于可以始终监视线路的状态，因此可以快速识别线路状态的故障。 由于传输数据不被编码，所以可以高速进行数据传输。

公开(公告)号：US5297134A

公开(公告)日：1994-03-22

申请号：US818832

申请日：1992-01-10

申请人： Noboru Takahashi ,  Noriyuki Hattori

发明人： Noboru Takahashi ,  Noriyuki Hattori

IPC分类号： H04L12/437 ,  H04J1/16

CPC分类号： H04L12/437

摘要： A transmission system formed by a master station and a plurality of satellite stations which are connected by a transmission line into a loop, the data and command signals from the master station being passed sequentially from station to station around the loop. A failure in a satellite station that prevents further loop transmission is detected by watchdog timers in one or more successive stations. As a result, the stations detecting the failure switch themselves into a bus-mode of operation, the master station switches itself and the remaining stations into the bus-mode of operation. The switching back to the loop-mode of operation can be performed under control of the master station automatically, upon detection that the failure has been corrected. The switching also can be performed under external command.

摘要翻译： 由主站和多个卫星站形成的传输系统，通过传输线路连接到环路中，来自主站的数据和命令信号从站到站周围循环。 在一个或多个连续的站中的看门狗定时器可以检测卫星站中阻止进一步环路传输的故障。 结果，检测到故障的站自身进入总线工作模式，主站将其自身和其余站切换到总线工作模式。 在检测到故障已被纠正后，可以在主站的控制下自动执行切换回环路模式的操作。 也可以在外部命令下进行切换。