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1. 发明授权

US4408189A Method and apparatus for code conversion of binary to multilevel signals 失效
标题翻译：用于将二进制码转换为多电平信号的方法和装置
公开(公告)号：US4408189A
公开(公告)日：1983-10-04
申请号：US264281
申请日：1981-05-18
申请人： Malcolm C. Betts , Alan F. Graves , Frederick M. Pascoe , James E. Dilley
发明人： Malcolm C. Betts , Alan F. Graves , Frederick M. Pascoe , James E. Dilley
IPC分类号： G11B20/14 , H04L25/49 , H03K13/24
CPC分类号： H04L25/4919 , G11B20/1496
摘要： A method and apparatus for converting a binary signal to one having quaternary-level symbols with no d-c component. To achieve this, the running digital sum is limited by selectively inverting words within each frame of (n) symbols. A separate (n+1)th symbol is added to each frame to indicate the selective inversion of the words, so that the correct polarity of the (n) symbols can be re-established.
摘要翻译：一种用于将二进制信号转换成具有没有d-c分量的四进制符号的方法和装置。为了实现这一点，运行数字和通过选择性地反转（n）个符号的每帧内的字来限制。在每个帧中添加单独的第（n + 1）个符号以指示单词的选择性反转，从而可以重新建立（n）个符号的正确极性。

2. 发明授权

US4837760A Communications system with protection switching using individual selectors 失效
标题翻译：具有使用个别选择器进行保护切换的通信系统
公开(公告)号：US4837760A
公开(公告)日：1989-06-06
申请号：US761926
申请日：1985-08-02
申请人： David I. Reid , John C. Ellson , Malcolm C. Betts
发明人： David I. Reid , John C. Ellson , Malcolm C. Betts
IPC分类号： H04J3/14 , H04J3/16
CPC分类号： H04J3/14 , H04J3/1641
摘要： An optical fiber communications system with a plurality of bidirectional channels and a protection channel is disclosed. Each channel has a respective identity which is transmitted in the traffic of that channel and in the event of a protection switch is identified in the protection channel traffic. A protection switch is effected by detecting a channel failure at the receive end of a span, transmitting a protection request on the return channel back to the transmit end of the span, and using this request in a controller for the channel to effect a protection switch, using an individual selector for the channel, if a priority scheme allows. The controllers are enabled or disabled under software control following a protection switch in accordance with the prevailing priority scheme. The arrangement provides for rapid protection switching.
摘要翻译：公开了具有多个双向通道和保护通道的光纤通信系统。每个信道具有在该信道的业务中发送的相应身份，并且在保护信道业务中识别出保护交换机的情况下。通过检测跨度的接收端的信道故障来实现保护开关，在返回信道上发送保护请求返回到跨度的发送端，并且在用于该信道的控制器中使用该请求来实现保护开关如果允许优先级方案，则使用通道的单个选择器。根据当前的优先方案，控制器在软件控制之后按照保护开关启用或禁用。该装置提供快速保护切换。

3. 发明授权

US4646286A Communications system with protection switching and channel identities 失效
标题翻译：具有保护切换和通道标识的通信系统
公开(公告)号：US4646286A
公开(公告)日：1987-02-24
申请号：US761925
申请日：1985-08-02
申请人： David I. Reid , John C. Ellson , Malcolm C. Betts
发明人： David I. Reid , John C. Ellson , Malcolm C. Betts
IPC分类号： H04B1/74 , H04J3/14
CPC分类号： H04B1/74
摘要： An optical fiber communications system with a plurality of bidirectional channels and a protection channel is disclosed. Each channel has a respective identity which is transmitted in the traffic of that channel and in the event of a protection switch is identified in the protection channel traffic. A protection switch is effected by detecting a channel failure at the receive end of a span, transmitting a protection request on the return channel back to the transmit end of the span, and using this request in a controller for the channel to effect a protection switch, using an individual selector for the channel, if a priority scheme allows. The controllers are enabled or disabled under software control following a protection switch in accordance with the prevailing priority scheme. The arrangement provides for rapid protection switching.
摘要翻译：公开了具有多个双向通道和保护通道的光纤通信系统。每个信道具有在该信道的业务中发送的相应身份，并且在保护信道业务中识别出保护交换机的情况下。通过检测跨度的接收端的信道故障来实现保护开关，在返回信道上发送保护请求返回到跨度的发送端，并且在用于该信道的控制器中使用该请求来实现保护开关如果允许优先级方案，则使用通道的单个选择器。根据当前的优先方案，控制器在软件控制之后按照保护开关启用或禁用。该装置提供快速保护切换。

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