Patent US2424983A successfully refreshed from Google Patents.
EP0260676A2
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Switching system
Assignee: Hitachi Ltd
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Filing: 1987-09-16
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Granted: —
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Expires: 2007-09-16
Abstract
Abstract A switching system for integratedly switching voice, data, image information and the like. The switching system comprises a plurality of front-end modules (201 to 208) each adapted to perform a switching processing in association with a subscriber line or a trunk line, and a single or a plurality of central modules (100; 1001, 1002) for interconnecting the plurality of front-end modules in star-type fashion and switching information prevailing between the front-end modules, in unit of block accommodating the information and a header added thereto to contain connection control information and in accordance with the contents of the header. The front-end modules are connected to the central module via inter-module highways (220 to 223; 230 to 233) each having frames occurring at a predetermined period and time slots contained in each frame to carry blocks.
Inventors
- 👤 Yoshito Sakurai
- 👤 Shinobu Gohara
- 👤 Kenichi Ohtsuki
- 👤 Takao Kato
- 👤 Hiroshi Kuwahara
- 👤 Eiichi Amada
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 20:19
CPC Classifications
H; H04; H04L; H04L49/00; H04L49/30; H04L12/00; H04L12/54; H04L12/56; H04L12/5601; H04L12/64; H04L12/6402; H04L49/10; H04L49/101; H04L49/104; H04L49/105; H04L49/106; H04L49/15; H04L49/1553; H04L49/1584; H04L49/25; H04L49/253; H04L49/255; H04L49/256; H04L49/3081; H04L49/309; H04L49/35; H04Q; H04Q11/00; H04Q11/04; H04Q11/0407; H04Q11/0421; H04Q11/06; H04J; H04J2203/00; H04J2203/0001; H04J2203/0003; H04J2203/0012; H04L2012/5638; H04L2012/5646; H04L2012/5651; H04L2012/5652; H04L2012/5678; H04L2012/5681; H04L12/6418; H04L2012/6481; H04L49/20; H04L49/205; H04L49/254; H04L49/3009; H04L49/3018
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
85 words
A switching system comprising: a plurality of front-end modules (201 to 208) each adapted to perform a switching processing in association with a subscriber line or a trunk line; and a single or a plurality of central modules (100; 1001, 1002) for interconnecting said plurality of front-end modules in star-type fashion and switching information prevailing between said front-end modules, in unit of block accommodating the information and a header added thereto to contain connection control information and in accordance with the contents of said header.
Claim 2
Dependent Claim
85 words
A switching system comprising: a plurality of front-end modules (201 to 208) each adapted to perform a switching processing in association with a subscriber line or a trunk line; and a single or a plurality of central modules (100; 1001, 1002) for interconnecting said plurality of front-end modules in star-type fashion and switching information prevailing between said front-end modules, in unit of block accommodating the information and a header added thereto to contain connection control information and in accordance with the contents of said header.
Claim 3
Dependent Claim
47 words
A switching system according to Claim 1 wherein said front-end modules are connected to said central module via inter-module highways (220 to 223; 230 to 233) each having frames occurring at a predetermined period and a plurality of time slots contained in each frame to carry blocks.
Claim 4
Dependent Claim
102 words
A switching system according to Claim 2 wherein each of said front-end modules (201 to 208) comprises: means (405) for determining a destination path for communication information coming from the subscriber line or the trunk line; means (403) for transmitting a block which accommodates the information and a header containing a destination front-end module number to a highway connected with said central module by loading said block on the time slots on said highway, said transmission of block being periodical for telephone voice information; and status managing means (406) for storing an idle/busy status of the subscriber line or the trunk line.
Claim 5
Dependent Claim
52 words
A switching system according to Claim 3 wherein said front-end module further comprises: means for deciding the idle/busy status of the subscriber line or the trunk line when a request is made; and means for transmitting and receiving a result of said decision between said plurality of front-end modules via said highway.
Claim 6
Dependent Claim
94 words
A switching system according to Claim 1 wherein said central module (100) comprises: a plurality of time switches (11 1 to 11 n ; 17 1 to 17 n ) connected to said plurality of front-end modules; a space switch (103) connected to said plurality of time switches; and means (102) for generating a read address or a write address for each time switch from header information for each block incoming from each front-end module, in such a manner that a plurality of blocks having the same destination do not coexist at a time.
Claim 7
Dependent Claim
97 words
A switching system according to Claim 5 wherein said address generating means (102) comprises: a first status managing memory (602) for monitoring every frame an idle/busy status of a link in association with an incoming highway of said space switch; a second status managing memory (603) for monitoring every frame an idle/busy status of a link in association with an outgoing highway of said space switch; and a circuit (604) for generating the read address or the write address for each of said plurality of time switches by looking up said first and second status managing memories.
Claim 8
Dependent Claim
157 words
A switching system according to Claim 1 wherein said central module (100) comprises: incoming highways (14, to 14 n ) and outgoing highways (15 1 to 15 n ), either of each incoming highway and each outgoing highway having a plurality of time slots carrying blocks; primary time switches (11 1 to 11 n ) connected to said incoming highways; secondary time switches (17, to 17 n ) connected to said outgoing highways; a space switch (103) for interconnecting said primary time switches and said secondary time switches; a group of buffer memories (121 1 to 121 n ) being in association with respective outgoing highways, each buffer memory and each primary time switch being in multiplexed connection with each incoming highway; and bus circuits (18, to 18 n ) for bus-coupling outputs of said buffer memories in association with respective outgoing highways and multiplex-connecting the outputs and each primary time switch to each corresponding outgoing highway.
Claim 9
Dependent Claim
170 words
A switching system according to Claim 1 wherein said central module (100) comprises: incoming highways (14, to 14 n ) and outgoing highways (15 1 to 15 n ), either of each incoming highway and each outgoing highway having a plurality of time slots carrying blocks; primary time switches (11 1 to 11 n ) connected to said incoming highways; secondary time switches (17 1 to 17 n ) connected to said outgoing highways; a space switch (103) for interconnecting said primary time switches and said secondary time switches; first buffer memories (122, to 122 n ) each having the input connected, together with each primary time switch, to each incoming highway and the output connected to the associated primary time switch; and second buffer memories (123, to 123 n ) each having the input multiplex-connected to the output of each first buffer memory, together with said associated primary time switch and the output connected to the associated first buffer memory to permit transfer information in unit of block therebetween.
Claim 10
Dependent Claim
160 words
A switching system comprising: a plurality of incoming highways (14, to 14 n ) a plurality of outgoing highways either of each incoming highway and each outgoing highway consisting of a plurality of blocks each containing connection control information and communication information; switching means (11 1 to 11 n ; 103) for switching communication information coming from said plurality of incoming highways and transmitted to said plurality of outgoing highways by rearranging said plurality of blocks spatially and on time axis; a plurality of storage means (12 1 to 12 n ) provided in association with said plurality of incoming highways; and a plurality of selection means (13 1 to 13 n ) provided in association with said plurality of incoming highways, each selection means having a first input directly connected to the associated incoming highway and a second input connected to the associated storage means, each selection means selectively connecting said first and second inputs to said switching means.
Claim 11
Dependent Claim
160 words
A switching system comprising: a plurality of incoming highways (14, to 14 n ) a plurality of outgoing highways either of each incoming highway and each outgoing highway consisting of a plurality of blocks each containing connection control information and communication information; switching means (11 1 to 11 n ; 103) for switching communication information coming from said plurality of incoming highways and transmitted to said plurality of outgoing highways by rearranging said plurality of blocks spatially and on time axis; a plurality of storage means (12 1 to 12 n ) provided in association with said plurality of incoming highways; and a plurality of selection means (13 1 to 13 n ) provided in association with said plurality of incoming highways, each selection means having a first input directly connected to the associated incoming highway and a second input connected to the associated storage means, each selection means selectively connecting said first and second inputs to said switching means.
Claim 12
Dependent Claim
94 words
A switching system according to Claim 9 wherein the connection control information in each block has in part information for distinguishing whether the communication information in the block requires real-time base processings or not and said system further comprises means for identifying the dis tinguishing information to control said blocks such that some of said blocks accommodating communication information requiring the real-time base processings select the first input of said selection means and some of said blocks accommodating communication information not requring the real-time base processings select the second input of said selection means.
Claim 13
Dependent Claim
90 words
A switching system according to Claim 9 wherein each of said plurality of storage means (12 1 to 12 n ) comprises: a plurality of buffer memories (71 1 to 71 n ) provided in association with destination outgoing highways to which said blocks are to be switched; means for waiting the block in one of said buffer memories in accordance with the connection control information accommodated in that block; and means for selecting any one of said buffer memories and reading the block stored in the selected buffer memory.
Claim 14
Dependent Claim
111 words
A switching system according to Claim 9 wherein each of said plurality of incoming highways is of a frame having a plurality of blocks and a field recorded with the number of blocks within the frame which are destined for respective destination outgoing highways, and a common control circuit is provided in common to said plurality of incoming highways, said common control circuit including means, connected to each of said plurality of incoming highways, for reading the field in each frame on each incoming highway, and means responsive to the read number of blocks destined for respective destination outgoing highways to generate a signal for controlling read of each storage means.
References Cited (Backward Citations)
No citation records indexed.
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