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1. 发明授权

US10547333B1 Methods and apparatus for flexible overhead forward error correction (FEC) sub-system for optical fiber communication systems 有权
公开(公告)号：US10547333B1
公开(公告)日：2020-01-28
申请号：US15904921
申请日：2018-02-26
申请人： Juniper Networks, Inc.
发明人： Murat Arabaci , Marianna Pepe , Philip A. Thomas , David Ofelt , Massimiliano Salsi
IPC分类号： H03M13/00 , H03M13/35 , H03M13/11 , H04B10/40
摘要： In some embodiments, an apparatus includes an optical transceiver which includes a rate-adaptive forward error correction (FEC) encoder and a rate-adaptive FEC decoder. The rate-adaptive FEC encoder is configured to adjust a number of a set of known symbols associated with a codeword to achieve rate adaption. A length of the codeword is fixed. The rate-adaptive FEC encoder is configured to generate the codeword based on (1) a set of information symbols including the set of known symbols and a set of data symbols, and (2) a fixed number of a set of parity symbols generated using information symbols. The rate-adaptive FEC decoder is configured to receive a set of reliability values associated with a channel word, and expand the set of reliability values to produce an expanded set of reliability values. The rate-adaptive FEC decoder is further configured to decode the expanded set of reliability values.

2. 发明授权

US09258192B2 Multi-chassis topology discovery using in-band signaling 有权
标题翻译：使用带内信令的多机架拓扑发现
公开(公告)号：US09258192B2
公开(公告)日：2016-02-09
申请号：US14146981
申请日：2014-01-03
申请人： Juniper Networks, Inc.
发明人： Philip A. Thomas , Anurag Agrawal
IPC分类号： H04L12/28 , H04L12/24
CPC分类号： H04L41/12 , H04L41/0876
摘要： A multi-chassis network device may automatically detect whether cables connected between chassis devices are correctly inserted. The device may insert, into a first data stream output from a first port of the device, control information identifying the first port. The device may receive, from a second data stream received by the first port of the device, second control information identifying a second port, at another device connected to the device via a cable. The device may determine, based on the second control information, whether the connection of the first port to the second port, via the cable, is valid and cause, when the connection of the first port to the second port is determined to not be valid, the device to output an indication that the connection is not valid or to reconfigure the device to make the connection of the first port to the second port valid.
摘要翻译：多机箱网络设备可以自动检测连接在机箱设备之间的电缆是否正确插入。设备可以将从第一端口输出的第一数据流插入到识别第一端口的控制信息中。设备可以从设备的第一端口接收的第二数据流接收标识第二端口的第二控制信息，在经由电缆连接到设备的另一设备处。设备可以基于第二控制信息确定第一端口到第二端口的连接是否经过电缆是有效的，并且当第一端口到第二端口的连接被确定为不是有效的时，用于输出连接无效的指示的设备或重新配置设备以使第一端口与第二端口的连接有效。

3. 发明授权

US09104345B2 Rate controlled first in first out (FIFO) queues for clock domain crossing 有权
标题翻译：速率控制先进先出（FIFO）队列用于时钟域交叉
公开(公告)号：US09104345B2
公开(公告)日：2015-08-11
申请号：US14211805
申请日：2014-03-14
申请人： Juniper Networks, Inc.
发明人： Anurag Agrawal , Philip A. Thomas
IPC分类号： G06F3/00 , G06F1/04 , G06F5/12
CPC分类号： G06F5/12 , G06F1/04
摘要： First in, first out (FIFO) queues may be used to transfer data between a producer clock domain and a number of consumer clock domains. In one implementation, a control component for the FIFO queues may include a number of counters, corresponding to each of the consumer clock domains, each of the counters maintaining a count value relating to an amount of data read by the corresponding consumer clock domain. The control component may additionally include a credit deduction component coupled to the count values of the counters, the credit deduction component determining whether any of the count values is above a threshold, and in response to the determination that any of the count values is above the threshold, reducing the count value of each of the counters and issuing a write pulse signal to the producer clock domain, the write pulse signal causing the producer clock domain to perform a write operation to the FIFO queues.
摘要翻译：首先，先出（FIFO）队列可以用于在生成器时钟域和多个消费者时钟域之间传送数据。在一个实现中，用于FIFO队列的控制组件可以包括与每个消费者时钟域相对应的多个计数器，每个计数器保持与由相应的消费者时钟域读取的数据量相关的计数值。控制部件还可以包括耦合到计数器的计数值的信用扣除部件，信用扣除部件确定任何计数值是否高于阈值，并且响应于确定任何计数值高于阈值，减少每个计数器的计数值并向生成器时钟域发出写入脉冲信号，该写入脉冲信号使得生成器时钟域对FIFO队列执行写入操作。

4. 发明申请

US20130121343A1 METHODS AND APPARATUS FOR TRANSMISSION OF GROUPS OF CELLS VIA A SWITCH FABRIC 有权
标题翻译：用于通过开关织物传输细胞群的方法和装置
公开(公告)号：US20130121343A1
公开(公告)日：2013-05-16
申请号：US13692425
申请日：2012-12-03
申请人： Juniper Networks, Inc.
发明人： Sarin Thomas , Srihari Vegesna , Pradeep Sindhu , Chi-Chung Kenny Chen , Jean-Marc Frailong , David J. Ofelt , Philip A. Thomas , Chang-Hong Wu
IPC分类号： H04J3/00
CPC分类号： H04J3/00 , H04L49/251 , H04L49/254
摘要： In one embodiment, a method can include receiving at an egress schedule module a request to schedule transmission of a group of cells from an ingress queue through a switch fabric of a multi-stage switch. The ingress queue can be associated with an ingress stage of the multi-stage switch. The egress schedule module can be associated with an egress stage of the multi-stage switch. The method can also include determining, in response to the request, that an egress port at the egress stage of the multi-stage switch is available to transmit the group of cells from the multi-stage switch.
摘要翻译：在一个实施例中，一种方法可以包括在出口调度模块处接收通过多级交换机的交换结构调度来自进入队列的小区的传输的请求。入站队列可以与多级交换机的进入级相关联。出口调度模块可以与多级交换机的出口级相关联。该方法还可以包括响应于该请求确定多级交换机的出口级的出口端口可用于从多级交换机发送该小区组。

5. 发明授权

US09906243B1 Methods and apparatus for flexible overhead forward error correction (FEC) sub-system for optical fiber communication systems 有权
公开(公告)号：US09906243B1
公开(公告)日：2018-02-27
申请号：US15080285
申请日：2016-03-24
申请人： Juniper Networks, Inc.
发明人： Murat Arabaci , Marianna Pepe , Philip A. Thomas , David Ofelt , Massimiliano Salsi
IPC分类号： H03M13/00 , H03M13/35 , H04B10/40 , H03M13/11
CPC分类号： H03M13/116 , H03M13/618 , H04B10/40
摘要： In some embodiments, an apparatus includes an optical transceiver which includes a rate-adaptive forward error correction (FEC) encoder and a rate-adaptive FEC decoder. The rate-adaptive FEC encoder is configured to adjust a number of a set of known symbols associated with a codeword to achieve rate adaption. A length of the codeword is fixed. The rate-adaptive FEC encoder is configured to generate the codeword based on (1) a set of information symbols including the set of known symbols and a set of data symbols, and (2) a fixed number of a set of parity symbols generated using information symbols. The rate-adaptive FEC decoder is configured to receive a set of reliability values associated with a channel word, and expand the set of reliability values to produce an expanded set of reliability values. The rate-adaptive FEC decoder is further configured to decode the expanded set of reliability values.

6. 发明授权

US09077466B2 Methods and apparatus for transmission of groups of cells via a switch fabric 有权
标题翻译：用于通过交换结构传输小区组的方法和装置
公开(公告)号：US09077466B2
公开(公告)日：2015-07-07
申请号：US13692425
申请日：2012-12-03
申请人： Juniper Networks, Inc.
发明人： Sarin Thomas , Srihari Vegesna , Pradeep Sindhu , Chi-Chung Kenny Chen , Jean-Marc Frailong , David J. Ofelt , Philip A. Thomas , Chang-Hong Wu
IPC分类号： H04L12/28 , H04J3/00 , H04L12/947 , H04L12/937
CPC分类号： H04J3/00 , H04L49/251 , H04L49/254
摘要： In one embodiment, a method can include receiving at an egress schedule module a request to schedule transmission of a group of cells from an ingress queue through a switch fabric of a multi-stage switch. The ingress queue can be associated with an ingress stage of the multi-stage switch. The egress schedule module can be associated with an egress stage of the multi-stage switch. The method can also include determining, in response to the request, that an egress port at the egress stage of the multi-stage switch is available to transmit the group of cells from the multi-stage switch.
摘要翻译：在一个实施例中，一种方法可以包括在出口调度模块处接收通过多级交换机的交换结构调度来自进入队列的小区的传输的请求。入站队列可以与多级交换机的进入级相关联。出口调度模块可以与多级交换机的出口级相关联。该方法还可以包括响应于该请求确定多级交换机的出口级的出口端口可用于从多级交换机发送小区组。

7. 发明授权

US08713220B2 Multi-bank queuing architecture for higher bandwidth on-chip memory buffer 失效
标题翻译：用于更高带宽片上存储器缓冲器的多库排队架构
公开(公告)号：US08713220B2
公开(公告)日：2014-04-29
申请号：US13732198
申请日：2012-12-31
申请人： Juniper Networks, Inc.
发明人： Anurag Agrawal , Philip A. Thomas
IPC分类号： G06F3/00
CPC分类号： H04L47/522 , H04L49/9047 , H04L49/9089
摘要： A network device includes a main storage memory and a queue handling component. The main storage memory includes multiple memory banks which store a plurality of packets for multiple output queues. The queue handling component controls write operations to the multiple memory banks and controls read operations from the multiple memory banks, where the read operations for at least one of the multiple output queues alternates sequentially between the each of the multiple memory banks, and where the read operations and the write operations occur during a same clock period on different ones of the multiple memory banks.
摘要翻译：网络设备包括主存储存储器和队列处理组件。主存储器包括存储用于多个输出队列的多个分组的多个存储体。队列处理组件控制对多个存储体的写入操作并控制来自多个存储体的读取操作，其中多个输出队列中的至少一个的读取操作在多个存储器组中的每一个之间顺序地交替，并且读取操作和写入操作在多个存储体中的不同存储体上的同一时钟周期内发生。

8. 发明授权

US09838138B1 Self-calibration of pluggable optical module 有权
公开(公告)号：US09838138B1
公开(公告)日：2017-12-05
申请号：US14984837
申请日：2015-12-30
申请人： Juniper Networks, Inc.
发明人： Murat Arabaci , Marianna Pepe , Massimiliano Salsi , Philip A. Thomas , David James Ofelt
IPC分类号： H04B10/588
CPC分类号： H04B10/588 , H04B10/612 , H04B10/613 , H04B10/614
摘要： Techniques are described for determining pre-compensation parameters to compensate for signal integrity degradation along a signal path. A processor generates a first digital signal and receives a second digital signal. The second digital signal is generated from an optical-to-electrical conversion of a feedback optical signal that is generated from an electrical-to-optical conversion of an electrical signal by an optical module. The processor determines the pre-compensation parameters based on the first and second digital signals.

9. 发明授权

US09240843B1 Method and apparatus for blind time skew compensation for coherent optical receivers 有权
标题翻译：用于相干光接收机的盲时间偏移补偿的方法和装置
公开(公告)号：US09240843B1
公开(公告)日：2016-01-19
申请号：US13730246
申请日：2012-12-28
申请人： Juniper Networks, Inc.
发明人： Christian Malouin , Philip A. Thomas , Murat Arabaci , Bo Zhang , Theodore J. Schmidt , Roberto Marcoccia
IPC分类号： H04B10/06 , H04B10/61
CPC分类号： H04B10/616
摘要： In some embodiments, an apparatus includes a coherent optical receiver that can receive during a first time period a set of in-phase signals and a set of quadrature signals having a skew from the set of in-phase signals. The coherent receiver can blindly determine a delay between the set of in-phase signals and the set of quadrature signals based on the set of in-phase signals and the set of quadrature signals. The delay includes an intersymbol portion and an intrasymbol portion. The coherent optical receiver can apply the delay at a second time after the first time period such that a skew after the second time is less than the skew at the first time period.
摘要翻译：在一些实施例中，一种装置包括相干光接收机，其可以在第一时间周期期间接收一组同相信号和一组正交信号，该组正交信号具有来自该组同相信号的偏斜。相干接收机可以基于同相信号和正交信号集合盲目地确定同相信号组和正交信号组之间的延迟。延迟包括符号间部分和内符号部分。相干光接收机可以在第一时间段之后的第二时间施加延迟，使得第二时间之后的偏斜小于第一时间段的偏斜。

10. 发明授权

US10097479B1 Methods and apparatus for randomly distributing traffic in a multi-path switch fabric 有权
公开(公告)号：US10097479B1
公开(公告)日：2018-10-09
申请号：US15087642
申请日：2016-03-31
申请人： Juniper Networks, Inc.
发明人： Philip A. Thomas , Sarin Thomas , Jean-Marc Frailong , Pradeep Sindhu
IPC分类号： H04L12/947 , H04L12/707 , H04L12/935
摘要： In some embodiments, an apparatus comprises a schedule module within a switch fabric system. At a first time, the schedule module is configured to access a list of status indicators associated with a group of egress port indicators. The list of status indicators includes a set of status indicators each of which has a value greater than a threshold. The schedule module is configured to randomly select a status indicator from the set of status indicators and configured to reduce the value of the selected status indicator. The schedule module is then configured to send the egress port indicator associated with the selected status indicator such that a data cell is sent from an egress port associated with that egress port indicator. At a second time, when the value of every status indicator from the list of status indicators is not greater than the threshold, the schedule module is configured to increase the value of every status indicator above the threshold.

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