EP0164611A2
Expired / Lapsed
EP
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Switching system and method for network having a plurality of terminal control equipment units
Assignee: Fujitsu Ltd
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Filing: 1985-05-17
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Granted: —
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Expires: 2005-05-17
Abstract
Abstract @ A switching system for a network having terminal control equipment units (31 to 3n) connected to a network termination unit (2), in which terminal control equipment units (31 to 3n) of the same kind are connected with an exchange (1) through a subscriber's line which has assigned to it a single subscriber number and which has a plurality of communication channels, the system including storage units for each terminal control equipment unit of the subscriber's line for storing call statuses of incoming calls. When a first incoming call is received, the storage units of the terminal control equipment units (31 to 3n) set respective call statuses for the first incoming call to a ringing state. When a second incoming call is received before a response to the first incoming call is transmitted, the storage units also set the call statuses for the second incoming call to a ringing state. When any one of the terminal control equipment units (31 to 3n) in the ringing state delivers a response, the call status for the first incoming call of the terminal control unit delivering the response is set to an active state and the call statuses for the first incoming call of the other terminal control units in the ringing state are released. The call statuses for the second incoming calls are maintained.
Inventors
- 👤 Tetsuo Nishino
- 👤 Hiroko Okamura
- 👤 Yasunori Yamatani
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 02:35
CPC Classifications
G; G06; G06F; G06F13/00; H; H04; H04Q; H04Q11/00; H04Q11/04; H04Q11/0428; H04Q11/0407
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
209 words
A switching system for a network having terminal control equipment units connected to a network termination unit, in which terminal control equipment units of the same kind are connected with an exchange through a subscriber's line which has assigned to it a single subscriber number and which has a plurality of communication channels, the system including storage means for each terminal control equipment unit of the subscriber's line for storing call statuses of incoming calls, wherein: when a first incoming call is received, the storage means of the terminal control equipment units set respective call statuses for the first incoming call to a ringing state; when a second incoming call is received before a response to the first incoming call is transmitted, the storage means also set the call statuses for the second incoming call to a ringing state; and when any one of the terminal control equipment units in the ringing state delivers a response, the call status for the first incoming call of the terminal control unit delivering the response is set to an active state and the call statuses for the first incoming call of the other terminal control units in the ringing state are released, the call statuses for the second incoming calls being maintained.
Claim 2
Dependent Claim
209 words
A switching system for a network having terminal control equipment units connected to a network termination unit, in which terminal control equipment units of the same kind are connected with an exchange through a subscriber's line which has assigned to it a single subscriber number and which has a plurality of communication channels, the system including storage means for each terminal control equipment unit of the subscriber's line for storing call statuses of incoming calls, wherein: when a first incoming call is received, the storage means of the terminal control equipment units set respective call statuses for the first incoming call to a ringing state; when a second incoming call is received before a response to the first incoming call is transmitted, the storage means also set the call statuses for the second incoming call to a ringing state; and when any one of the terminal control equipment units in the ringing state delivers a response, the call status for the first incoming call of the terminal control unit delivering the response is set to an active state and the call statuses for the first incoming call of the other terminal control units in the ringing state are released, the call statuses for the second incoming calls being maintained.
Claim 3
Dependent Claim
16 words
A system according to claim 1, wherein said subscriber's line is a time division multiplex line.
Claim 4
Dependent Claim
20 words
A system according to claim 1, wherein said storage means are arranged in each of the terminal control equipment units.
Claim 5
Dependent Claim
30 words
A system according to claim 1, wherein the data stored in said storage means includes the process information generated by said terminal control equipment units for each of the calls.
Claim 6
Independent Claim
172 words
A method for controlling the simultaneous arrival of a plurality of calls in a switching system having terminal control equipment units connected to an exchange termination through a digital subscriber's line; each of said terminal control equipment units comprising: first decision means for deciding whether a terminal is in a free state or not; second decision means for deciding whether an incoming call terminating state is in progress when the decision of said first decision means is that a terminal is not in a free state; and execution means for executing processes corresponding to plural call terminations; wherein the terminating control is carried out so that a ringing signal is sent back to said exchange when the decision of said first decision means is that a terminal is not in a free state and the decision of said second decision means is that an incoming call terminating state is in progress, and a connect signal by a terminal's answer is sent to said exchange by executing said process for the incoming call.
Claim 7
Independent Claim
172 words
A method for controlling the simultaneous arrival of a plurality of calls in a switching system having terminal control equipment units connected to an exchange termination through a digital subscriber's line; each of said terminal control equipment units comprising: first decision means for deciding whether a terminal is in a free state or not; second decision means for deciding whether an incoming call terminating state is in progress when the decision of said first decision means is that a terminal is not in a free state; and execution means for executing processes corresponding to plural call terminations; wherein the terminating control is carried out so that a ringing signal is sent back to said exchange when the decision of said first decision means is that a terminal is not in a free state and the decision of said second decision means is that an incoming call terminating state is in progress, and a connect signal by a terminal's answer is sent to said exchange by executing said process for the incoming call.
References Cited (Backward Citations)
No citation records indexed.
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