Time division multiplex communication system
First Claim
1. A time division multiplex communication system comprising:
- a set of loop shaped transmission line pairs for transmitting time division multiplexed signals via a first transmission line pair in a first loop direction and via a second transmission line pair in the opposite loop direction;
a central office connected to starting ends and terminal ends of each said transmission line pair;
and a plurality of local offices located at intermediate points of each said transmission line pair;
said central office including means connected to the starting and terminal ends of said transmission line pair for transmitting and receiving signals therewith, and a processing means for assigning time slots of time division multiplexed channels of said transmission line pairs to data signals to be sent via the transmission line pairs and for sending an interoffice signal regarding said assignment of the time slots to said local offices;
each of said local offices including access means for accessing the assigned time slots of said time division multiplexed channels of said transmission line pairs, and control means responsive to said interoffice signal sent from said central office for controlling said access means, whereby when a communication is made between two offices belonging to said loop, said processing means of the central office assigns a time slot to said offices between which said communication is made for causing the access means of said local offices to operate under control of said control means of the local office so as to form with said assigned time slots two route channels, one passing through a specific point on a transmission path provided by said transmission line pairs, while the other not passing through said specific point thereby performing interoffice communications through either one of said route channels under the control of either one of said processing means of the central office and said control means of the local office.
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0 Petitions
Accused Products
Abstract
A time division multiplex communication circuit is constituted by a set of loop shaped transmission line pairs which transmits time division multiplexed signals via a clockwise transmission line and a counterclockwise transmission line, a center office connected to starting and terminal ends of the transmission line pair, and a plurality of local offices located at intermediate points of the transmission line pair. The center office includes a device connected to the starting and terminal ends of the transmission line pair for transmitting and receiving signals therewith, and a processing means for assigning time slots of time division multiplexed channels of the transmission line pairs to signals to be sent to the transmission line pairs and for sending an interoffice signal regarding the assignment of the time slots to the local offices. Each local office includes access means for accessing the assigned time slots of the time division multiplexed signals on the transmission line pair, and control means responsive to the interoffice signal sent from the center office for controlling the access means, whereby when a communication is made between two offices belonging to the loop, the processing means of the central office assigns time slot to said offices between which communication is made for causing the access means of the local offices to operate under control of the control means so as to form with the assigned time slots two route channels, one passing through a specific point on a transmission path provided by the transmission line pair, while the other not passing through the specific point thereby performing interoffice communications through at least one of the route channels under the control of either one of the processing means of the central office and the control means of the local office.
27 Citations
21 Claims
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1. A time division multiplex communication system comprising:
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a set of loop shaped transmission line pairs for transmitting time division multiplexed signals via a first transmission line pair in a first loop direction and via a second transmission line pair in the opposite loop direction; a central office connected to starting ends and terminal ends of each said transmission line pair; and a plurality of local offices located at intermediate points of each said transmission line pair; said central office including means connected to the starting and terminal ends of said transmission line pair for transmitting and receiving signals therewith, and a processing means for assigning time slots of time division multiplexed channels of said transmission line pairs to data signals to be sent via the transmission line pairs and for sending an interoffice signal regarding said assignment of the time slots to said local offices; each of said local offices including access means for accessing the assigned time slots of said time division multiplexed channels of said transmission line pairs, and control means responsive to said interoffice signal sent from said central office for controlling said access means, whereby when a communication is made between two offices belonging to said loop, said processing means of the central office assigns a time slot to said offices between which said communication is made for causing the access means of said local offices to operate under control of said control means of the local office so as to form with said assigned time slots two route channels, one passing through a specific point on a transmission path provided by said transmission line pairs, while the other not passing through said specific point thereby performing interoffice communications through either one of said route channels under the control of either one of said processing means of the central office and said control means of the local office. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 10, 11, 14, 15, 16, 17, 18, 19, 20, 21)
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9. A time division multiplex communication system comprising:
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a plurality of loop transmission line pairs for transmitting time division multiplexed signals through first transmission lines in a first loop direction and through second transmission lines in the opposite loop direction; a central office connected to starting and terminal ends of respective transmission line pairs; and a plurality of local offices disposed at intermediate points of said transmission line pairs; said central office including means connected to respective starting and terminal ends of said transmission line pairs for transmitting and receiving signals therewith, and a processing means for assigning time slots of time division multiplexed channels of said transmission line pairs and for sending an interoffice signal regarding said assignment to said local offices; each one of said local offices including access means for accessing the assigned slots of said time division multiplexed channels of said transmission line pairs, and means responsive to the interoffice signal sent from said central office for controlling the operation of said access means, whereby when a communication is made between two offices belonging to said loop, said processing means of the central office assigns one time slot to said offices between which said communication is made for causing the access means of corresponding local offices to operate under the control of said control means so as to form with said assigned time slots two route channels, one passing through a specific point on a transmission path provided by said transmission line pairs, while the other not passing through said specific point, thereby performing interoffice communications through either one of said route channels under the control of either one of said processing means of said central office and the control means of the local office. - View Dependent Claims (12, 13)
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Specification