专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明专利

DE69936966T2 未知
公开(公告)号：DE69936966T2
公开(公告)日：2008-05-15
申请号：DE69936966
申请日：1999-12-09
申请人： HITACHI LTD , HITACHI INFORMATION TECHNOLOGY
发明人： ENDO NOBORU , WAKAYAMA KOJI , MORIWAKI NORIHIKO , AIMOTO TAKESHI , SAKAMOTO KENICHI , MATSUYAMA NOBUHITO
IPC分类号： H04L47/43 , H04L47/6275 , H04L47/629
摘要： An input interface (3) segments a variable length packet (74) into plurality of fixed length cells and generates an internal switching information based on the header information of the variable length packet (74). The input interface (3) transmits the information to a switch (101) and, after that, transmits the cells as the following cells of the information to the switch (101). The switch (101) performs switching processing to the succeeding cells based on the information. Therefore, the information is not added to the cells. When an input interface (3) starts to transmit cells generated from a packet to its destination output interface (4) through the switch (101), the switch (101) is reserved until all the cells arrive at the output interfaces (4).

2. 发明专利

DE69836298T2 未知
公开(公告)号：DE69836298T2
公开(公告)日：2007-09-27
申请号：DE69836298
申请日：1998-06-18
申请人： RICOH PRINTING SYS LTD , HITACHI INFORMATION TECHNOLOGY
发明人： YOSHINO EIJI , TAMURA HITOSHI , SASAKI AKIRA , TADOKORO HIROYUKI , SUZUKI NOBUO , INUZUKA TATSUKI , ONOSE ATSUSHI , SATOO TATSUNARI , SHIBUYA TAKESHI , OKADA TADASHI , KANDA MASAYUKI , URATA NAOYUKI
IPC分类号： G06K15/02 , G06T3/60 , G06T5/00 , H04N1/387 , H04N1/405 , H04N1/409 , H04N1/41 , H04N1/60 , H04N1/64
摘要： A personal computer (20A) has a print image developing means (641A) and a data compression means (642A) including a fixed rate compression. A color printer (21A) has a data extension means (921A), a color correction means (922A), a gamma correction means (924A), a first halftoning means (925A), an image area segmentation means (926A), and a second halftoning means (927A). A transmission time of a print image can be shortened necessarily less than a constant time, and further since an enormous memory for an extension is unnecessary, a low cost printer can be provided.

3. 发明专利

CA2282159C PACKET FORWARDING APPARATUS WITH A FLOW DETECTION TABLE 未知
公开(公告)号：CA2282159C
公开(公告)日：2004-11-02
申请号：CA2282159
申请日：1999-09-10
申请人： HITACHI INFORMATION TECHNOLOGY , HITACHI LTD
发明人： SUGAI KAZUO , MATSUYAMA NOBUHITO , AIMOTO TAKESHI , YAZAKI TAKEKI
IPC分类号： H04L12/46 , H04L12/54 , H04Q11/04 , H04L12/56
摘要： A packet forwarding apparatus provided with a plurality of line interface units, comprises a routing processing unit, a flow detection unit and a packet forwarding unit. The routing processing unit refers to a routing table based on header information in a received packet to specify one of a plurality output lines to which the received packet is output. The flow detection unit refers to an entry table in which a plurality of entries with flow conditions and control information are registered to retrieve control information defined by the entry with a flow condition which coincides with that of the header information of the received packet. The packet forwarding unit transfers the received packet to one of the line interface units connected to the output line specified by the routing processing unit. An entry table is divided into a plurality of subtables corresponding to the values of flow attributes associated with the received packets. The flow detection unit retrieves the control information from one of said subtables specified by the value of the flow attribute corresponding to the received packet.

4. 发明专利

DE60223451D1 未知
公开(公告)号：DE60223451D1
公开(公告)日：2007-12-27
申请号：DE60223451
申请日：2002-05-21
申请人： HITACHI LTD , HITACHI INFORMATION TECHNOLOGY
发明人： TAKATANI YUKIHIRO , NONAKA NAOMICHI , KOIZUMI MINORU
IPC分类号： H04L47/27
摘要： A system for use with communications according to TCP, or a similar protocol, comprises a sender host 80, one or more routers 70d, 70e and a destination host 90. Each router 70 comprises means for generating acknowledgement packets and translating addresses associated with data packets. When a data packet is received by a router 70d, an acknowledgement packet is returned with a source address corresponding to the router 70d and a destination address corresponding to the sender host 80. The sender host 80 perceives the acknowledgement packet as having been sent by the destination host 90. As the acknowledgement packet is sent by the router 70d, and not the destination host 90, this system allows acknowledgement packets to be received on a shorter timescale, reducing the effects of a link delay. Although the route between the sender host 80 and the destination host 90 is divided into multiple connections, the hosts 80, 90 perceive a single, conventional connection.

5. 发明专利

CA2281018C PACKET RELAYING APPARATUS AND HIGH SPEED MULTICAST SYSTEM 未知
公开(公告)号：CA2281018C
公开(公告)日：2004-10-12
申请号：CA2281018
申请日：1999-08-30
申请人： HITACHI INFORMATION TECHNOLOGY , HITACHI LTD
发明人： AIMOTO TAKESHI , SEKINO HIROSHI , MATSUYAMA NOBUHITO , SUGAI KAZUO , AKAHANE SHINICHI , SAKO YOSHIHITO
IPC分类号： G06F13/00 , H04L12/18 , H04L12/46 , H04L13/08 , H04L45/60 , H04L12/56
摘要： In a high speed multicast route searching method of searching information of a transmission port to which a received multicast packet is next transferred: a route address is formed by coupling a receiver address and a sender address in this order; one p-th power-of-2-branch tree node is configured by a collection of one two-branch tree node and two-branch tree nodes of p-1 stages totalling ((p-th power of 2) - 1) nodes just under the one two-branch tree node to form a p-th power-of-2-branch tree which is stored in a memory; not one bit but consecutive p bits of the route address coupling the receiver address and sender address in a received multicast packet in this order are checked at the same time; and in accordance with the values of the consecutive bits, a search tree stored in the memory is searched. In this manner, a search process can be completed by tracing nodes (the number of bits of a search key divided by p) times at a maximum, independently from the number of entries.

6. 发明专利

CA2282159A1 PACKET FORWARDING APPARATUS WITH A FLOW DETECTION TABLE 未知
公开(公告)号：CA2282159A1
公开(公告)日：2000-04-05
申请号：CA2282159
申请日：1999-09-10
申请人： HITACHI INFORMATION TECHNOLOGY , HITACHI LTD
发明人： YAZAKI TAKEKI , MATSUYAMA NOBUHITO , SUGAI KAZUO , AIMOTO TAKESHI
IPC分类号： H04L12/46 , H04L12/54 , H04L45/74 , H04L49/111 , H04L49/901 , H04Q11/04 , H04L12/56
摘要： A packet forwarding apparatus provided with a plurality of line interface units, comprises a routing processing unit for referring to a routing table, based on header information of received packet to specify one of output lines to output the received packet, a flow detection unit for referring to an entry table, in which a plurality of entries with flow conditions and control information are registered, to retrieve control information defined by the entry with a flow condition which coincides with that of the header information of the received packet, and a packet forwarding unit for transferring the received packet to one of the line interface units connected to the output line specified by the routing processing unit. The entry table id divided into a plurality of subtables corresponding to the values of flow attributes associated with the received packets and the flow detection unit retrieves the control information from one of said subtables specified by the value of the flow attribute corresponding to the received packet.

7. 发明专利

DE60223451T2 未知
公开(公告)号：DE60223451T2
公开(公告)日：2008-11-27
申请号：DE60223451
申请日：2002-05-21
申请人： HITACHI LTD , HITACHI INFORMATION TECHNOLOGY
发明人： TAKATANI YUKIHIRO , NONAKA NAOMICHI , KOIZUMI MINORU
IPC分类号： H04L47/27
摘要： A system for use with communications according to TCP, or a similar protocol, comprises a sender host 80, one or more routers 70d, 70e and a destination host 90. Each router 70 comprises means for generating acknowledgement packets and translating addresses associated with data packets. When a data packet is received by a router 70d, an acknowledgement packet is returned with a source address corresponding to the router 70d and a destination address corresponding to the sender host 80. The sender host 80 perceives the acknowledgement packet as having been sent by the destination host 90. As the acknowledgement packet is sent by the router 70d, and not the destination host 90, this system allows acknowledgement packets to be received on a shorter timescale, reducing the effects of a link delay. Although the route between the sender host 80 and the destination host 90 is divided into multiple connections, the hosts 80, 90 perceive a single, conventional connection.

8. 发明专利

DE69936966D1 未知
公开(公告)号：DE69936966D1
公开(公告)日：2007-10-11
申请号：DE69936966
申请日：1999-12-09
申请人： HITACHI LTD , HITACHI INFORMATION TECHNOLOGY
发明人： ENDO NOBORU , WAKAYAMA KOJI , MORIWAKI NORIHIKO , AIMOTO TAKESHI , SAKAMOTO KENICHI , MATSUYAMA NOBUHITO
IPC分类号： H04L47/43 , H04L47/6275 , H04L47/629
摘要： An input interface (3) segments a variable length packet (74) into plurality of fixed length cells and generates an internal switching information based on the header information of the variable length packet (74). The input interface (3) transmits the information to a switch (101) and, after that, transmits the cells as the following cells of the information to the switch (101). The switch (101) performs switching processing to the succeeding cells based on the information. Therefore, the information is not added to the cells. When an input interface (3) starts to transmit cells generated from a packet to its destination output interface (4) through the switch (101), the switch (101) is reserved until all the cells arrive at the output interfaces (4).

9. 发明专利

DE69836298D1 未知
公开(公告)号：DE69836298D1
公开(公告)日：2006-12-14
申请号：DE69836298
申请日：1998-06-18
申请人： RICOH PRINTING SYS LTD , HITACHI INFORMATION TECHNOLOGY
发明人： YOSHINO EIJI , TAMURA HITOSHI , SASAKI AKIRA , TADOKORO HIROYUKI , SUZUKI NOBUO , INUZUKA TATSUKI , ONOSE ATSUSHI , SATOO TATSUNARI , SHIBUYA TAKESHI , OKADA TADASHI , KANDA MASAYUKI , URATA NAOYUKI
IPC分类号： G06K15/02 , G06T3/60 , G06T5/00 , H04N1/387 , H04N1/405 , H04N1/409 , H04N1/41 , H04N1/60 , H04N1/64
摘要： A personal computer (20A) has a print image developing means (641A) and a data compression means (642A) including a fixed rate compression. A color printer (21A) has a data extension means (921A), a color correction means (922A), a gamma correction means (924A), a first halftoning means (925A), an image area segmentation means (926A), and a second halftoning means (927A). A transmission time of a print image can be shortened necessarily less than a constant time, and further since an enormous memory for an extension is unnecessary, a low cost printer can be provided.

10. 发明专利

DE19958243A1 Mounting structure of electronic device e.g. host computer, has logic and power supply units alternately configured on both sides of back board, one power supply supplies electric power to adjacent logic unit 未知
公开(公告)号：DE19958243A1
公开(公告)日：2000-07-27
申请号：DE19958243
申请日：1999-12-03
申请人： HITACHI LTD , HITACHI INFORMATION TECHNOLOGY
发明人： WATARAI MICHIHITO , HAYASHI YUTAKA , MIYAMOTO MITSUO , MATSUO KAZUHIRO , KADOMOTO EIJI , NAKAYAMA AKIHIRO , SAKURAI AKIHIRO , TSUBAKI SHIGEYASU
IPC分类号： H05K7/14 , H05K7/20 , H02B1/56
摘要： A logic unit (3) and a power supply unit (2) are alternately configured on both sides of back board (6). The power supply unit (2) and logic unit (3) are then arranged in next row with opposing arrangement. Distance between power supply and logic unit maintaining equal electric power is supplied from power supply to adjacent logic unit. An air blower (5) supplies cool air to logic and power supply units.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式