EP0369802A2
Expired / Lapsed
EP
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Network system
Assignee: Hitachi Ltd
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Filing: 1989-11-16
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Granted: —
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Expires: 2009-11-16
Abstract
Abstract A network system includes a transmission line (0) including a plurality of transmission channels (C₁-C₄), a plurality of transmission equipment (1-N) connected to the transmission line (0) to effect the transmission and reception of information between each other, and a plurality of devices (1a, 1b, 2a, 2b, 3a-3c, 4a-4d, 5a-5b, Na-Nc) connected to each of the transmission equipment (1-N), thereby effecting the transmission of information between the devices connected to the plurality of transmission equipment. Each of the transmission equipment (1-N) includes a demultiplexing unit (I₃) for separating an input signal from the transmission line (0) into a plurality of receiving transmission channels (C₁-C₄), a channel switch unit (I₆) for receiving the plurality of receiving transmission channels (C₁-C₄), outputting designated one of the transmission channels to one of the devices connected to the transmission equipment (1-N) in question, and receiving transmitting information to form an information transmitting channel and combining it with other channels to be passed to form a plurality of sending transmission channels, and a multiplexing unit for receiving the plurality of sending transmission channels from the channel switch unit (I₆) to multiplex and output the plurality of sending transmission channels.
Inventors
- 👤 Takuji Hamada
- 👤 Masakazu Okada
- 👤 Hiroshi Tomizawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 10:23
CPC Classifications
H; H04; H04L; H04L12/00; H04L12/64; H04L12/28
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
214 words
A network system comprising: a transmission line (0) including a plurality of transmission channels (C₁-C₄); a plurality of transmission equipment (1-N) connected to said transmission line (0) to transmit and receive information from each other; a plurality of devices (1a, 1b, 2a, 2b, 3a-3c, 4a-4d, 5a-5b, Na-Nc) connected to each of said transmission equipment (1-N) to effect transfer of information between said devices connected to said plurality of transmission equipment, each of said transmission equipment (1-N) including: a demultiplexing unit (I₃) for separating an input signal from said transmission line (0) into a plurality of receiving transmission channels (C₁, C₂, C₃); at least one channel switch unit (I₆) for receiving the plurality of receiving transmission channels (C₁-C₄), outputting selected one of said plurality of separated transmission channels (C₁-C₄) to one of said devices (1a, 1b, 2a, 2b, 3a-3c, 4a-4d, 5a-5b, Na-Nc connected to each said transmission equipment (1-N), and receiving transmitting information from said one device to form an information sending channel and combining the same with other channels to be passed to form a plurality of sending transmission channels (C₁-C₄); and a multiplexing unit (I₄) for receiving the plurality of sending transmission channels (C₁-C₄) from said channel switch unit (I₆) and multiplexing said plurality of sending transmission channels (C₁-C₄) to generate an output.
Claim 2
Dependent Claim
214 words
A network system comprising: a transmission line (0) including a plurality of transmission channels (C₁-C₄); a plurality of transmission equipment (1-N) connected to said transmission line (0) to transmit and receive information from each other; a plurality of devices (1a, 1b, 2a, 2b, 3a-3c, 4a-4d, 5a-5b, Na-Nc) connected to each of said transmission equipment (1-N) to effect transfer of information between said devices connected to said plurality of transmission equipment, each of said transmission equipment (1-N) including: a demultiplexing unit (I₃) for separating an input signal from said transmission line (0) into a plurality of receiving transmission channels (C₁, C₂, C₃); at least one channel switch unit (I₆) for receiving the plurality of receiving transmission channels (C₁-C₄), outputting selected one of said plurality of separated transmission channels (C₁-C₄) to one of said devices (1a, 1b, 2a, 2b, 3a-3c, 4a-4d, 5a-5b, Na-Nc connected to each said transmission equipment (1-N), and receiving transmitting information from said one device to form an information sending channel and combining the same with other channels to be passed to form a plurality of sending transmission channels (C₁-C₄); and a multiplexing unit (I₄) for receiving the plurality of sending transmission channels (C₁-C₄) from said channel switch unit (I₆) and multiplexing said plurality of sending transmission channels (C₁-C₄) to generate an output.
Claim 3
Dependent Claim
36 words
A network system according to claim 1, wherein said transmission line (O) is formed by multiplexing a plurality of low-speed channels (C₁-C₄), and wherein each said transmission equipment (1-N) is operable at said low-speed channel speed.
Claim 4
Dependent Claim
74 words
A network system according to claim 1, wherein the transfer of information between said transmission channels (C₁-C₄) in each said transmission equipment (1-N) is effected in a manner that the reception of information is effected through one of said channels (C₁-C₄) assigned to each said transmission equipment (1-N) and the transmission of information is effected by sending the same to one of said channels (C₁-C₄) assigned to information-addressed one of said transmission equipment (1-N).
Claim 5
Dependent Claim
79 words
A network system according to claim 1, wherein receiving information inputted from said channel switch unit (I₆) by said selected receiving transmission channel (C₁-C₄) connected to said one device (1a, 1b, 2a, 2b, 3a-3c, 4a-4d, 5a-5b, Na-Nc) connected to each said transmission equipment (1-N) is transmitting information addressed to each said transmission equipment (1-N), and wherein input information passed through said channel switch unit (I₆) is transmitting information addressed to any other of said plurality of transmission equipment (1-N).
Claim 6
Dependent Claim
19 words
A network system according to claim 1, wherein said transmission line (0) is in the form of a ring.
Claim 7
Dependent Claim
124 words
A network system according to claim 1, wherein said transmission line (0) is formed into an open ring shape, and wherein in each said transmission equipment (1-N), said demultiplexing unit (I₃) and said multiplexing unit (I₄) are connected to one of said open-ring transmission lines, and there are further provided a second demultiplexing unit (I 3B2 ) connected to the other of said transmission lines (0) to separate a receiving signal received from said the other transmission line into a plurality of transmission channels (C₁-C₄) to output one of said plurality of channels (C₁-C₄) assigned to each said transmission equipment (1-N) as a receiving transmission channel to said one device connected thereto, and a selector (I₉) for bypassing the remainder of said transmission channels.
Claim 8
Dependent Claim
91 words
A network system according to claim 1, wherein said channel switch unit (I₆) includes switch control means (I₆₄) including a detection circuit (I₆₄₄) for detecting one of said transmission equipment (1-N) of a destination stored in a receiving signal, a packet switching control circuit (I₆₄₃) responsive to an output of said detection circuit (I₆₄₄) to effect packet switching, and circuit switch means (I₆₄₇) storing a transmitting channel information switching pattern for said receiving channel whereby the transmission of information is effected by the assigned receiving channel of said destination transmission equipment.
Claim 9
Dependent Claim
59 words
A network system according to claim 7, wherein the signal handled by each said transmission equipment (1-N) is a packet signal, and wherein said detection circuit (I₆₄₄) of said switch control means (I₆₄) detects one of said plurality of channels (C₁-C₄) to which said destination transmission equipment (1-N) is connected in accordance with destination information in a packet cell.
Claim 10
Dependent Claim
36 words
A network system according to claim 7, wherein transmitting information handled by each said transmission equipment (1-N) is a circuit signal, and wherein said switch control means (I₆₄) sends circuit information to said destination transmission equipment.
Claim 11
Dependent Claim
112 words
A network system according to claim 1, further comprising a spatial switch (I₆₅) for receiving the plurality of receiving transmission channels (C₁-C₄) from said demultiplexing unit (I₃) to effect an inter-channel circuit information interchange in accordance with a predetermined circuit information interchange pattern to generate an output whereby said spatial switch (I₆₅) performs an inter-channel information interchange on the circuit information in said receiving channel input information, and a detection circuit (I₆₄₄) for detecting one of said transmission channels to which addressed one of said transmission equipment (1-N) is connected in accordance with destination information of a packet cell whereby an inter-channel transfer of packet information is effected by said detection circuit.
Claim 12
Dependent Claim
44 words
A network system according to claim 1, wherein a plurality of said channel switch units (I₆) are connected in cascade, and wherein a plurality of devices (1a, 1b, 2a, 2b, 3a-3c, 4a-4d, 5a-5b, Na-Nc) are connected to each of said channel switch units (I₆).
Claim 13
Dependent Claim
16 words
A network system according to claim 1, wherein said transmission line (0) includes a single channel.
Claim 14
Dependent Claim
73 words
A network system according to claim 8, wherein a token is added to said packet signal, and wherein said channel switch unit (I₆) includes a selector (I₆₃) for receiving, in parallel with said channel switch unit, the plurality of receiving transmission channels sent from said multiplexing unit to select one of said channels assigned as a receiving channel to each said transmission equipment and output the same to one of said connected devices.
Claim 15
Dependent Claim
67 words
A network system according to claim 8, wherein said switch control means (I₆₄) further includes a number storage register (I₆₄₅) for storing a receiving transmission channel number of a transmitting destination whereby when the transmitting destination receiving transmission channel number outputted from said detection circuit (I₆₄₄) does not coincide with the content of said number storage register, said connected device is requested to retransmit the transmitting information.
Claim 16
Dependent Claim
32 words
A network system according to claim 8, wherein when said detection circuit (I₆₄₄) detects a plurality of receiving transmission channels of transmitting destinations, said switch control means (I₆₄) transmit information in sequence.
Claim 17
Dependent Claim
77 words
A network system according to claim 8, wherein the information in said signal is divided into areas used for transmission and areas used for reception whereby said channel switch unit selects for said transmission areas receiving channel information of said transmission channel assigned as a receiving channel to said destination transmission equipment (1-N) and for said receiving areas information from said channel assigned for reception to each said transmission equipment (1-N), thereby mixing and outputting the same.
References Cited (Backward Citations)
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