Digital service unit for connecting data processing equipment to a telephone system based computer network
First Claim
1. A digital service unit for transferring digital data between first and second subscriber loops and a computer forming part of a computer network comprising a multipoint network which includes a plurality of network unit with at least one of said network units comprising said digital service unit, said network units coupled to telephone system communication links and communicating with each other on said communication links, transmitting and receiving digital data in a framed mode in which said data is organized into frames on said communication links, each said frame including synchronization data, command data, error correcting data, and user data,said digital service unit comprising:
- means for storing an address identifying said digital service unit;
receiving means for receiving a said frame on said first subscriber loop;
first control means for generating command data in response to a command included in the said command data of a said received frame;
second control means for executing a command specified by the said command data included in said received frame provided said command data indicates said stored address as the target thereof;
computer port means for transmitting user data to and receiving user data from said computer;
multiplexer means for generating a said frame including said received user data, said multiplexer means further comprising subscriber loop output port means for transmitting said generated frame on said first subscriber loop; and
demultiplexer means for separating said user data from a said received frame and for transmitting said user data on said computer port means, said demultiplexer means including subscriber loop input port means for receiving said frame on said second subscriber loop.
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Accused Products
Abstract
An apparatus for coupling data processing equipment to subscriber loops in a telephone system based computer network is disclosed. The multipoint communication network includes a plurality of network units with at least two of the network units comprising the apparatus in question. The network units are coupled to telephone system communication links. The network units transmit and receive digital data in a frame mode in which the data is organized into frames on the communication links. The network units also communicate with each other in a manner which allows the configuration and speed of the network to varied in response to the time of day and error rates observed on the telephone system communcation links.
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Citations
15 Claims
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1. A digital service unit for transferring digital data between first and second subscriber loops and a computer forming part of a computer network comprising a multipoint network which includes a plurality of network unit with at least one of said network units comprising said digital service unit, said network units coupled to telephone system communication links and communicating with each other on said communication links, transmitting and receiving digital data in a framed mode in which said data is organized into frames on said communication links, each said frame including synchronization data, command data, error correcting data, and user data,
said digital service unit comprising: -
means for storing an address identifying said digital service unit; receiving means for receiving a said frame on said first subscriber loop; first control means for generating command data in response to a command included in the said command data of a said received frame; second control means for executing a command specified by the said command data included in said received frame provided said command data indicates said stored address as the target thereof; computer port means for transmitting user data to and receiving user data from said computer; multiplexer means for generating a said frame including said received user data, said multiplexer means further comprising subscriber loop output port means for transmitting said generated frame on said first subscriber loop; and demultiplexer means for separating said user data from a said received frame and for transmitting said user data on said computer port means, said demultiplexer means including subscriber loop input port means for receiving said frame on said second subscriber loop. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification