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21. 发明专利

JPH0646062A ADDRESS SETTLING METHOD IN INTEGRATED NETWORK SYSTEM 失效
公开(公告)号：JPH0646062A
公开(公告)日：1994-02-18
申请号：JP19671792
申请日：1992-07-23
申请人： HITACHI LTD
发明人： TSUKAGOSHI MASAHITO , MURAKAMI TOSHIHIKO , TAKADA OSAMU , SAKO YOSHITO
IPC分类号： H04L12/46 , H04L12/28
摘要： PURPOSE:To reduce a processing for deriving a physical address of a destination, when a network connecting device relays a packet, in the integrated network system. CONSTITUTION:A path control means 20 of network connecting devices 1, 2 for connecting networks 3-6 learns the correspondence of a network address and a physical address from a transmission origin physical address and a transmitting origin network address existing in a packet between communication terminals 8-12, and registers it in an address settlement table 22. This registered information is utilized for deriving a physical address of a destination determined by using a path control table 21. Accordingly, by learning the correspondence of the network address and the physical address, the physical address of the destination is derived easily. Therefore, the packet transfer throughput of the network connecting devices 1, 2 is improved, and as result, the through of the whole integrated network system is improved.

22. 发明专利

JPH04199264A TEXT EDITOR 失效
公开(公告)号：JPH04199264A
公开(公告)日：1992-07-20
申请号：JP31777290
申请日：1990-11-26
申请人： HITACHI LTD
发明人： IKEDA NAOYA , OGURA TOSHIHIKO , SAKO YOSHITO
IPC分类号： G06F17/21
摘要： PURPOSE:To enable the operator of a text editor to obtain the page number of a necessary page from a cover picture by automatically displaying the heading character string of each page together with relevant page numbers on the cover picture. CONSTITUTION:A cover picture containing the list of the heading of each page of a text file being edited is automatically displayed without requiring operators to input a specific heading character string. In the case of three-page text data shown in Fig. a, for example, the page number of each page is shown in a page number showing column 101 and the first seven characters of each page are extracted as the heading character string of each page and shown in a character string showing column 102 as shown in the cover picture 100. Therefore, part of a program can be easily referred to when the program is prepared.

23. 发明专利

JPH02290347A TEST METHOD FOR NETWORK SYSTEM AND DUPLICATED ADDRESS 失效
公开(公告)号：JPH02290347A
公开(公告)日：1990-11-30
申请号：JP3156490
申请日：1990-02-14
申请人： HITACHI LTD , HITACHI SOFTWARE ENG
发明人： NAKAYASHIKI SUSUMU , KASHIO JIRO , MATSUMURA HISASHI , WADA HIROYUKI , SAKO YOSHITO , MATSUURA FUMIAKI , KAJITANI IHEI
IPC分类号： H04L12/42
摘要： PURPOSE:To prevent residence of a terminal station of the same address in duplicate in the same ring by writing 'No' into a flag information storage device when a duplicated address test frame sent from its own station is received and it is discriminated that no duplicate address exists in the frame. CONSTITUTION:A duplicate address test DAT frame sent from a 1st terminal station is returned to the 1st terminal station being a sender while an address recognition display AC field is rewritten logical '1' with a 2nd terminal station when the 2nd terminal station having the same address as the 1st terminal station exists on its way of circulation of a ring. When the AC of the received DAT frame is logical '1', the 1st terminal station erases the DAT frame circulated in the ring and reaches the bypass state. When the 2nd terminal station in the state of DAC '0' at the downstream of the 1st terminal station receives the DAT frame sent by the 1st terminal station, the 2nd terminal station applies the similar operation as the 1st terminal station. Thus, the 2nd terminal station receives the DAT frame of AC '0' and is resident in the network.

24. 发明专利

JPH02230840A TEST METHOD FOR NETWORK ADDRESS 失效
公开(公告)号：JPH02230840A
公开(公告)日：1990-09-13
申请号：JP4984889
申请日：1989-03-03
申请人： HITACHI LTD , HITACHI SOFTWARE ENG
发明人： NAKAYASHIKI SUSUMU , SAKO YOSHITO , YAMAMURA NOBUHIKO , USUI MASAMICHI , ISHIKAWA KAZUYA
IPC分类号： H04L12/40
摘要： PURPOSE:To facilitate the distinguishment of an active system and a standby system between plural servers having the same function by allowing each terminal station to detect uniquely the presence of terminal stations having the same address in a network. CONSTITUTION:A terminal station 3-1 includes an address (group address and function address or the like) assigned to its own station to an address test frame(ATF) 4 and broadcasts the result to the entire area in a network. A terminal station 3-2 receiving a frame checks the rationality of an address and decides the operation of its own station such as the reply of a response depending on the check result. Thus, the abnormality of address allowing duplication in the network such as a function address or a group address assigned to terminal stations 3-1 and 3-2 is detected.

25. 发明专利

JP2000201176A NETWORK CONNECTING DEVICE 失效
公开(公告)号：JP2000201176A
公开(公告)日：2000-07-18
申请号：JP69999
申请日：1999-01-05
申请人： HITACHI LTD , HITACHI INFORMATION NETWORK
发明人： SHIMANO TOMIO , FUJITA MASAHIKO , SAKO YOSHITO
IPC分类号： H04L12/823 , H04L12/873 , H04L12/883 , H04L12/56
摘要： PROBLEM TO BE SOLVED: To minimize the discard rate of transmission data corresponding to the dynamic variation of mean transmission data quantity and to eliminate the influences of the steady traffics of buses other than its own one by changing dynamically the maximum queue length in a communication mode in response to the mean transmission data quantity and the accumulated transmission data quantity of every logical communication path or the queue staying time of the transmission data. SOLUTION: The mean transmission data quantity SP1 of its selected own path is compared with the mean transmission data quantity SP2 of another path (420, 421). If the quantity SP1 is larger than the quantity SP2, the queue length increment value is added to the maximum queue length variation value to change the latter value in a range under the maximum queue length (422). If the quantity SP1 is smaller than the quantity SP2, the maximum queue length variation value is changed in a range over the minimum queue length (423). Then the queue length is compared with the maximum queue length variation value (424, 425). If the former length is not more the latter value, the transmission data are accumulated in a transmission queue and adds 1 to these transmission data within the maximum variation value (426).

26. 发明专利

JPH11205320A NETWORK MANAGEMENT METHOD 失效
公开(公告)号：JPH11205320A
公开(公告)日：1999-07-30
申请号：JP829698
申请日：1998-01-20
申请人： HITACHI LTD , HITACHI SOFTWARE ENG
发明人： SATO SHUNICHI , SAKO YOSHITO
IPC分类号： G06F13/00 , H04L12/24 , H04L12/26 , H04L12/28 , H04L12/46
摘要： PROBLEM TO BE SOLVED: To simplify the network management by managing nodes as one node by means of an SNMP even if a plurality of routers connect with the nodes owing to channel increase. SOLUTION: In the system configuration where the plurality of inter-network routers are connected by inter-router switches, a representative inter-network router is selected of routers in operation according to priority decided in advance by the configuration definition. The representative inter-network router manages accessing to logical data structure of management information base(MIB) stored by an agent as a local manager with respect to the SNMP agent on each inter-network router including its own router. With a request for access to the MIB from the SNMP manager operating on the network management device the router operates and responds as an agent on a virtual device storing the MIB collectively.

27. 发明专利

JPH0818599A INTERNETWORK EQUIPMENT 失效
公开(公告)号：JPH0818599A
公开(公告)日：1996-01-19
申请号：JP14437894
申请日：1994-06-27
申请人： HITACHI LTD
发明人： IKEDA NAOYA , SAKO YOSHITO
IPC分类号： H04L12/46 , H04L12/28
摘要： PURPOSE:To reduce a quantity of a memory used for a routing table of an internetwork equipment by compressing information and storing compressed information depending on the frequency of use of a routing table of each routing processor. CONSTITUTION:The equipment is provided with a relay controller 10 consisting of a relay control table 8 used to decide a relay destination network in a routing processor and of an entry retrieval device 9. The equipment is provided with an entry frequency of use discrimination device 13 to count the frequency of use of the relay controller 10 and minimized information of a network address discriminated not frequently in use by the device 13 is stored in a routing information compressor 11 in other form. When the routing of the network address of the other form is required, routing information is inquired of the routing manager 2 and the relay is made depending on the result and the routing information is generated by an entry generator 12 in a first entry form.

28. 发明专利

JPH07143156A MEMORY AND ITS APPLICATION DEVICE 失效
公开(公告)号：JPH07143156A
公开(公告)日：1995-06-02
申请号：JP28943193
申请日：1993-11-18
申请人： HITACHI LTD
发明人： IKEDA NAOYA , WATABE KEN , SAWADA SUNAO , ENOMOTO HIROMICHI , SAKO YOSHITO
IPC分类号： G11C15/04 , G06F13/00 , H04L12/28 , H04L12/46 , H04L12/741 , H04L12/931
摘要： PURPOSE:To realize filtering function at a high speed by using only data corresponding to bits designated to be valid by a database mask register for a discrimination object. CONSTITUTION:M-sets of data discrimination circuit cells 2 are provided in a CAM (associative memory) 1. Each data discrimination circuit 2 is provided with a database register 21, a database mask register 22, a database register comparison means discriminating the content of data stored in input data register and the database register 21 as to whether or not the content is coincident for each bit and providing the output of a discrimination result representing full bit coincidence, and a comparator circuit 23 with bit mask function generating a control signal used to make only data corresponding to bits designated to be valid by the database mask register 22 among the data stored in the database register 21 to be a discrimination object by the database register comparison means.

29. 发明专利

JPH0730587A FRAME RELAY CONTROL METHOD AND ITS DEVICE 失效
公开(公告)号：JPH0730587A
公开(公告)日：1995-01-31
申请号：JP17397793
申请日：1993-07-14
申请人： HITACHI LTD , HITACHI SOFTWARE ENG
发明人： SAKO YOSHITO , NAKAGAWA TSUTOMU , NIWA TOKUHIRO , IKEDA NAOYA
IPC分类号： H04N7/18 , H04L12/66 , H04L12/701 , H04L12/747
摘要： PURPOSE:To decide a frame relay destination at a high speed by receiving a frame to decide a relay destination network and rearranging the connection of plural relay table entries depending on the frequency of use. CONSTITUTION:Every time a repeater 1 receives a frame and an entry retrieval device 3 retrieves a relay control table entry, an entry revision device 42 rearranges a control table entry of a relay control table entry group 4 or a grouped relay control table entry. That is, when a frame of same destination address is continuously received, the rearrangement of the relay control table entry is executed by the reception of one frame. The relay control table entry used to retrieval of the destination network of this frame is rearranged to be retrieved with priority from next time. Thus, the relay destination network in the reception frame is decided at a high speed.

30. 发明专利

JPH06295274A INFORMATION PROCESSOR 失效
公开(公告)号：JPH06295274A
公开(公告)日：1994-10-21
申请号：JP8062993
申请日：1993-04-07
申请人： HITACHI LTD
发明人： OURA TETSUO , SAKO YOSHITO , WATANABE TOMONORI
IPC分类号： G06F13/00 , H04L29/02 , H04L29/10
摘要： PURPOSE:To make a communication adapter, which performs communication processing in layer 2 or lower, report the end of transmission with data handled in layer 3 or higher as a unit. CONSTITUTION:A CPU 1 divides a file to be transmitted into plural transmission data and stores them in a transmission data area 11 and stores a transmission command for transmission of each transmission data in a transmission command area 10. The transmission command corresponding to the last of transmission data into which the file is divided includes discrimination information indicating that it is the last. A communication controller 20 of a communication control adapter 19 successively takes out transmission commands from the communication command area 11 and transmits transmission data in the transmission data area in accordance with these commands. When the taken-out transmission command includes discrimination information indicating that it is the last, a TX-RLS 21 of a transmission buffer state flag 27 is set. When the TX-RLS 21 is set, an interrupt is caused to the CPU 1. Consequently, the CPU 1 can freely designate the unit of the transmission end interrupt to the CPU 1.

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