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1. 发明授权

US07113501B2 Synchronization of V42bis de/compression for V34/V42 modem relay method and apparatus 有权
公开(公告)号：US07113501B2
公开(公告)日：2006-09-26
申请号：US09728431
申请日：2000-11-30
申请人： Mehryar Khalili Garakani , Nathan R. Melhorn , Marcus Prewarski , Herbert M. Wildfeuer
发明人： Mehryar Khalili Garakani , Nathan R. Melhorn , Marcus Prewarski , Herbert M. Wildfeuer
IPC分类号： H04L12/66 , G01G31/08 , H04J3/06 , H04B1/38
CPC分类号： H04L5/1438 , H04L1/004
摘要： Method and apparatus for synchronizing two de/compression modems, e.g. V.42bis modems, in a voice frame network, the modems each being connected with a corresponding gateway to form a corresponding segment, are described. The method includes terminating the physical layer at either end of the corresponding gateways; negotiating at either gateway a physical layer and error-correcting data link layer with the corresponding modem; sending from either gateway to an associated modem in response to any poll command therefrom a not-ready message; signaling the other gateway when physical layer and error-correcting data link layer negotiations have been completed; and when each gateway has signaled the other that negotiations have been completed, halting the not-ready message-sending and sending instead a ready message to a corresponding modem, whereby synchronized compressed and decompressed data transmissions between the modems commences on a reliable transport. Preferably, thereafter, and upon occurrence of a destructive break condition or receipt at either gateway from a corresponding modem of an initiate data transfer command, such condition or receipt is relayed from a segment where it is detected to the other segment, thereby maintaining synchronization between the modems. Preferably, the messages and commands are compliant with the ITU-T V.42 protocol.

2. 发明授权

US07382730B2 Two-pass method and apparatus for achieving maximal data compression for a modem relay mode of operation in a voice frame network 有权
标题翻译：用于实现语音帧网络中的调制解调器中继操作模式的最大数据压缩的双程方法和装置
公开(公告)号：US07382730B2
公开(公告)日：2008-06-03
申请号：US09728430
申请日：2000-11-30
申请人： Mehryar Khalili Garakani , Nathan R. Melhorn , Marcus Prewarski
发明人： Mehryar Khalili Garakani , Nathan R. Melhorn , Marcus Prewarski
IPC分类号： H04L12/56
CPC分类号： H04L65/607 , H04L5/1438 , H04L29/06027 , H04L69/04
摘要： The present invention is a two-pass method and apparatus for achieving maximal data compression for a voice frame modem relay channel between two endpoint modems. The method includes transitioning the channel from a voice mode to a modem relay mode of operation; negotiating maximal compression parameters for either of two endpoint segments; communicating the same from one segment to the other; and then negotiating maximal end-to-end data compression parameters based upon the negotiated endpoint segment compression parameters. The end-to-end negotiation preferably involves re-negotiating one of the endpoint segments. The apparatus includes a dual first-pass negotiation mechanism for independently determining the maximal data compression capability of each segment; an end-to-end data compression capability determination mechanism for determining the maximal end-to-end data compression capability based upon the independently determined capability of each segment; and a second-pass negotiation mechanism for establishing the determined maximal end-to-end data compression capability for the channel.
摘要翻译：本发明是一种用于在两个端点调制解调器之间实现语音帧调制解调器中继信道的最大数据压缩的双程方法和装置。该方法包括将信道从语音模式转换到调制解调器中继操作模式; 为两个端点段之一协商最大压缩参数; 将其从一个段传递到另一个段; 然后基于协商的端点段压缩参数协商最大端到端数据压缩参数。端到端协商优选地涉及重新协商端点段之一。该装置包括用于独立地确定每个段的最大数据压缩能力的双重首次协商机制; 端到端数据压缩能力确定机制，用于基于每个段的独立确定的能力来确定最大端到端数据压缩能力; 以及用于为该信道建立所确定的最大端到端数据压缩能力的二次通过协商机制。

3. 发明授权

US07103072B1 System and method for synchronization of devices across a packet network 有权
标题翻译：通过分组网络同步设备的系统和方法
公开(公告)号：US07103072B1
公开(公告)日：2006-09-05
申请号：US10326505
申请日：2002-12-19
申请人： William Sloan , Mark Rumer , Marcus Prewarski
发明人： William Sloan , Mark Rumer , Marcus Prewarski
IPC分类号： H04J3/06
CPC分类号： H04J3/0685
摘要： A local time of a broadband loop carrier terminal is synchronized to a network time received from a source external to the broadband loop carrier terminal by comparing the local time to the network time to generate an error offset, and adjusting the local time based on the error offset. The network time may be received in response to a Network Time Protocol (NTP) poll transmitted by the broadband loop carrier terminal. In some cases, the poll is transmitted over a communication medium using an asynchronous packet protocol, such as Ethernet or TCP/IP. In one embodiment, the local time is based on the output of a local oscillator (e.g., a voltage controlled oscillator), the frequency of which may be adjusted using control logic which uses a filtered version of the error offset along with a factory calibration and/or temperature compensation to produce a control voltage to control the oscillator frequency.
摘要翻译：通过将本地时间与网络时间进行比较以产生误差偏移，并且基于误差来调整本地时间，宽带环路载波终端的本地时间与从宽带环路载波终端外部的源接收的网络时间同步抵消。可以响应于宽带环路载波终端发送的网络时间协议（NTP）轮询来接收网络时间。在某些情况下，使用异步分组协议（例如以太网或TCP / IP）在通信介质上传输轮询。在一个实施例中，本地时间基于本地振荡器（例如，压控振荡器）的输出，其频率可以使用控制逻辑来调整，该控制逻辑使用误差偏移的滤波版本以及工厂校准， /或温度补偿产生控制电压来控制振荡器频率。

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