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1.发明授权
公开(公告)号：US5027376A
公开(公告)日：1991-06-25
申请号：US200626
申请日：1988-05-31
申请人： Paul Friedman , Nathan Melhorn
发明人： Paul Friedman , Nathan Melhorn
IPC分类号： H03M7/42
CPC分类号： H03M7/42
摘要： Disclosed is a data compressing modem for connection to a decompressing modem over communication lines. The compressing modem receives an input data stream, and each character in the data stream is recodified with a compressed character code, the length of which is dependent on the frequency of the character in the data stream. A frequency table is maintained so that changes in the relative frequency of characters in the data stream will be recognized by the compressing modem and the compressed character codes representing such characters will be exchanged accordingly. A decompressing modem, which is connected over communication lines to the compressing modem, processes the compressed character code in a reverse order from the manner in which the compresing modem processing the codes. The decompressing modem also maintains a relative frequency table and as the relative frequencies of the various characters change, the actual characters represented by the compression codes must also change.
摘要翻译： 公开了一种用于通过通信线路连接到解压缩调制解调器的数据压缩调制解调器。 压缩调制解调器接收输入数据流，数据流中的每个字符用压缩字符代码重新编码，其长度取决于数据流中字符的频率。 维持频率表，使得数据流中字符的相对频率的变化将被压缩调制解调器识别，并且代表这样的字符的压缩字符代码将被相应地交换。 通过通信线路连接到压缩调制解调器的解压缩调制解调器以压缩调制解调器处理代码的方式以相反的顺序处理压缩字符代码。 解压缩调制解调器还保持相对频率表，并且随着各种字符的相对频率改变，由压缩码表示的实际字符也必须改变。
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公开(公告)号：US5978805A
公开(公告)日：1999-11-02
申请号：US856111
申请日：1997-05-14
申请人： Dwayne A. Carson
发明人： Dwayne A. Carson
CPC分类号： G06F17/30176 , Y10S707/99953
摘要： A method and apparatus is disclosed for synchronizing files stored in memory of two remotely located systems. The system can generate a copy of a source file at the destination location without transferring all the data of the source file. The destination location includes a reference file that can contain similar data as that contained in the source file. The synchronization is accomplished by sending keys (representing reference blocks of data from the reference file) to the source system. At the source system, a portion of each keys called a Feature is compared with portions of source file. If the Features match, a checksum corresponding to the reference block is compared with a check sum corresponding to the source block. If the checksums match, an short message identifying the key and reference block that matched is transmitted to the destination system in order that the reference block can be copied from the reference file in order to build the synchronized file.
摘要翻译： 公开了用于同步存储在两个位于远的系统的存储器中的文件的方法和装置。 该系统可以在目标位置生成源文件的副本，而不传输源文件的所有数据。 目的位置包括一个可以包含与源文件中包含的类似数据的引用文件。 通过向源系统发送键（将参考文件的参考数据块表示）发送到同步。 在源系统中，将称为功能的每个键的一部分与源文件的部分进行比较。 如果特征匹配，则将与参考块相对应的校验和与对应于源块的校验和进行比较。 如果校验和匹配，则将匹配的密钥和参考块的短消息发送到目的地系统，以便可以从参考文件复制参考块以构建同步文件。
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公开(公告)号：US5826198A
公开(公告)日：1998-10-20
申请号：US888444
申请日：1997-07-07
申请人： Lewis A. Bergins , Michael Onorato , Jerry Falk , Richard Carey , Dennis Kloc , Roy Greene
发明人： Lewis A. Bergins , Michael Onorato , Jerry Falk , Richard Carey , Dennis Kloc , Roy Greene
IPC分类号： H04B1/10 , H04B7/005 , H04L1/16 , H04L1/18 , H04L12/56 , H04M15/00 , H04W4/24 , H04W24/00 , H04W28/04 , H04W28/14 , H04W52/50 , H04W76/02 , H04W76/06 , H04W84/04 , H04W88/02 , H04W99/00 , H04B1/38 , H04M1/00
CPC分类号： H04W88/02 , H04L1/1887 , H04M15/00 , H04W24/00 , H04W4/24 , H04W52/50 , H04W99/00 , H04B1/1027 , H04L1/1607 , H04L1/18 , H04L1/188 , H04M2215/14 , H04M2215/143 , H04M2215/146 , H04M2215/32 , H04W28/14 , H04W76/02 , H04W76/06 , H04W84/042
摘要： An improved system for the transmission of data over a cellular telephone channel is provided. The system is especially adapted to reduce the cost associated with cellular telephone calls by allowing data transmission only when the channel signal level is greater than a pre-defined value, so as maximize the probability that a transmission will be successful. In addition, the system provides for user transparent reconnection and reestablishment of a dropped link, allowing transmission to continue where dropped without the need to retransmit data already successfully received. As an additional benefit, the system provides a mechanism for call timing and billing so that an estimated bill may be generated based on connection time.
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公开(公告)号：US5644593A
公开(公告)日：1997-07-01
申请号：US300490
申请日：1994-09-02
CPC分类号： H04M11/06 , H04L29/06 , H04L69/323
摘要： A parallel interface is provided between a standard parallel port of a computer system and a modem so as to increase the data transfer rate between the two systems without modifying the hardware of the computer system and independently of the application program running on the computer system.
摘要翻译： 在计算机系统的标准并行端口和调制解调器之间提供并行接口，以便增加两个系统之间的数据传输速率，而无需修改计算机系统的硬件，而与计算机系统上运行的应用程序无关。
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公开(公告)号：US5251213A
公开(公告)日：1993-10-05
申请号：US881806
申请日：1992-05-12
CPC分类号： H04L12/4625 , H04L12/4637
摘要： A multiport source routing token ring bridge is provided which permits a single local area network bridge to interconnect to multiple remote bridges without limitations on the number of rings and bridges interspersed between a data packet's source and its intended destination. The bridge receives a packet and then scans the packet for ring-in information which matches the ring to which the bridge is attached. If this match is not successful, then the packet is not passed to the software and the address recognize and frame copy bits at the end of the packet are not set. If the match is successful, then the bridge number and next ring-in (or ring-out) segment information from the packet are used as addresses to a static RAM array. The array is preprogrammed with all valid bridge number and ring-out combinations which may be accessed by the multiport source routing bridge. If addressing of the array produces a valid indication, then the packet is passed to software for forwarding to the appropriate local area network or wide area network ports. On the other hand, if the address does not produce an indication that it can be reached through the bridge, then the hardware parses the packet to extract the next ring and bridge information, and repeats the above process until either a complete match is found and the packet is passed, or the information field is exhausted and the packet is finally rejected.
摘要翻译： 提供了一种多端口源路由令牌环形网桥，其允许单个局域网桥连接到多个远程网桥，而不限制散布在数据分组的源和其预期目的地之间的环和桥的数量。 桥接收数据包，然后对数据包进行扫描，该信息与桥连接的环相匹配。 如果该匹配不成功，则该数据包不会传递给软件，并且该地址被识别，并且数据包末尾的帧复制位未被设置。 如果匹配成功，则将来自数据包的桥号和下一个环入（或振铃）段信息用作静态RAM阵列的地址。 该阵列使用可由多端口源路由桥接器访问的所有有效的桥号和振铃组合进行预编程。 如果阵列的寻址产生有效的指示，则该分组被传递到软件以转发到适当的局域网或广域网端口。 另一方面，如果地址不产生通过网桥可以达到的指示，则硬件解析分组以提取下一个环和桥接信息，并重复上述过程，直到发现完全匹配， 分组被传递，或者信息字段被耗尽并且分组被最终拒绝。
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公开(公告)号：US5729573A
公开(公告)日：1998-03-17
申请号：US461506
申请日：1995-06-05
CPC分类号： H04M11/06 , H04L29/06 , H04L69/323
摘要： parallel interface is provided between a standard parallel port of a computer system and a modem so as to increase the data transfer rate between the two systems without modifying the hardware of the computer system and independently of the application program running on the computer system.
摘要翻译： 在计算机系统的标准并行端口和调制解调器之间提供并行接口，以便增加两个系统之间的数据传输速率，而无需修改计算机系统的硬件，而与计算机系统上运行的应用程序无关。
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公开(公告)号：US5577033A
公开(公告)日：1996-11-19
申请号：US253753
申请日：1994-06-03
CPC分类号： H04L12/18 , H04L12/28 , H04L12/1886 , Y10S370/904
摘要： A method and apparatus for using switched telecommunications services to emulate a local area network (LAN) medium. The method and apparatus convert a public switched network or an equivalent private network into a LAN cabling method for connecting distant devices using the same communications software as used in traditionally wired LANs.
摘要翻译： 一种使用交换电信业务来模拟局域网（LAN）介质的方法和装置。 该方法和装置将公共交换网络或等效专用网络转换成LAN布线方法，用于使用与传统有线LAN中使用的相同的通信软件连接远程设备。
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公开(公告)号：US5241565A
公开(公告)日：1993-08-31
申请号：US720638
申请日：1991-06-25
申请人： Dennis Kloc , Richard A. Carey
发明人： Dennis Kloc , Richard A. Carey
CPC分类号： H04W52/367 , H04L1/0003 , H04L1/0025 , H04L1/0026 , H04L1/206 , H04W52/18 , H04L1/18
摘要： A telecommunications system intermittently checks and, if necessary, adjusts the power level of the transmitted data as a function of the transmission characteristics of the transmission line so as to optimize transmission performance.
摘要翻译： 电信系统间歇地检查并根据传输线的传输特性来调整发射数据的功率电平，以便优化传输性能。
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9.发明授权Apparatus and method for learning and filtering destination and source addresses in a local area network system 失效用于学习和过滤局域网系统中目的地和源地址的装置和方法
公开(公告)号：US5136580A
公开(公告)日：1992-08-04
申请号：US524162
申请日：1990-05-16
IPC分类号： H04L12/46
CPC分类号： H04L12/4625 , H04L45/7453
摘要： An apparatus and method for learning and filtering destination and source addresses in a local area network (LAN) system is provided to facilitate the transfer of information packets from one local area network to another. The apparatus provides a link between two (or more) remotely located LANS through the use of a LAN bridge. The apparatus has a LAN controller interface, a microprocessor, a state machine and one or more content addressable memories which function to monitor an information packet received from the LAN. One such apparatus is connected to each of the LANs to be interfaced and each of these apparatus to each other in order to communicate messages between the LANs. Upon detection of an information packet, the apparatus examines both the source and destination addresses of the packet. The source address is compared to a dynamically generated table of source addresses and then compared to the incoming destination address. If the destination address is found in the table of source addresses, than the packet is destined for a node on the local LAN and thus will not be sent over the bridge between the two LANs. If, on the other hand, the destination address is not in the table, the packet is forwarded to the remote LAN.
摘要翻译： 提供了一种用于学习和过滤局域网（LAN）系统中的目的地和源地址的装置和方法，以便于将信息分组从一个局域网传输到另一个局域网。 该设备通过使用LAN桥提供两个（或更多）远程定位的LAN之间的链路。 该装置具有LAN控制器接口，微处理器，状态机以及用于监视从LAN接收到的信息包的功能的一个或多个内容可寻址存储器。 一个这样的设备被连接到要接口的每个LAN，并且这些设备中的每一个彼此连接，以便在LAN之间传送消息。 在检测到信息分组时，设备检查分组的源和目的地址。 将源地址与动态生成的源地址表进行比较，然后与传入的目标地址进行比较。 如果在源地址表中找到目标地址，则该分组将发往本地LAN上的节点，因此不会通过两个LAN之间的桥发送。 另一方面，如果目的地址不在表中，则该分组被转发到远程LAN。
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公开(公告)号：US6122287A
公开(公告)日：2000-09-19
申请号：US599183
申请日：1996-02-09
摘要： In order to transfer data via a switched network that provides a wide range of network services, the users must establish a circuit or network connection and establish a data link connection. The circuit or network connection provides the physical connection between the users and data link connection provides the protocols and procedures for the transfer of data. Because the network provides a wide range of services, the users, typically by prior agreement, designate a common data link protocol to facilitate the transfer of data. A data link connection will not be established if the users are not using the same data link protocol. A method and apparatus are disclosed which permit a local system to detect the data link protocol used by a remote system. The invention provides a method for detecting the data link protocol used by the remote system when the remote system initiates the data link setup and a method for detecting the data link protocol when the local system initiates the data link setup.
摘要翻译： 为了通过提供广泛网络服务的交换网络传输数据，用户必须建立电路或网络连接并建立数据链路连接。 电路或网络连接提供了用户之间的物理连接，数据链路连接提供了传输数据的协议和过程。 因为网络提供了广泛的服务，所以通常通过事先约定的用户指定一个通用的数据链路协议来促进数据的传输。 如果用户不使用相同的数据链路协议，则不会建立数据链路连接。 公开了一种允许本地系统检测由远程系统使用的数据链路协议的方法和装置。 本发明提供了一种当远程系统启动数据链路建立时用于检测由远程系统使用的数据链路协议的方法，以及当本地系统启动数据链路建立时检测数据链路协议的方法。
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