Method and apparatus for sending data
First Claim
1. In a communication system for transmitting and receiving data signals, said system having first and second digital terminal stations connected to each other by digital communication lines and first and second data terminals connected to said first and second digital terminal stations by first and second analog communication lines, respectively, a method comprising the steps of:
- providing said first digital terminal with a first modulator having a predetermined data signaling rate;
providing said first digital terminal station with first digital transceiver means and a first demodulator capable of synchronizing its data signaling rate with the data signaling rate of said first modulator;
providing said second digital terminal station with second digital transceiver means and a second modulator having the same data signaling rate as that of said first modulator;
providing said second data terminal with a second demodulator capable of synchronizing its data signaling rate with the data signaling rate of said second modulator of said second digital terminal station;
originating at either said first data terminal or said second data terminal a data transmission call;
establishing a communication link between said first data terminal and said second data terminal through said first and second digital terminal stations;
transmitting a series of data signals by said first modulator from said first data terminal to said first digital terminal station during said data transmission call;
receiving by said first demodulator the data signals from said first digital terminal;
said first digital transceiver means transmitting the data signals from said first digital terminal station to said second digital terminal station during said data transmission call;
receiving by said second digital transceiver means the data signals from said first digital transceiver means; and
transmitting the data signals from said second digital terminal station by said second modulator to said second data terminal during said data transmission call.
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Accused Products
Abstract
A communication system which includes two digital terminal stations connected to each other by a digital communication line. The communication system includes data terminals adapted for operation on an analog communication line which transmits main data and control data. The data terminal has two modems for transmitting respective data. Correspondingly, the digital terminal station has two modems which modulate and demodulate the respective data signal for transmitting the data from the digital communication line through the analog communication line and vice versa. The data transmission between two data terminals through the digital terminal stations is completed in one transmission call.
19 Citations
7 Claims
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1. In a communication system for transmitting and receiving data signals, said system having first and second digital terminal stations connected to each other by digital communication lines and first and second data terminals connected to said first and second digital terminal stations by first and second analog communication lines, respectively, a method comprising the steps of:
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providing said first digital terminal with a first modulator having a predetermined data signaling rate; providing said first digital terminal station with first digital transceiver means and a first demodulator capable of synchronizing its data signaling rate with the data signaling rate of said first modulator; providing said second digital terminal station with second digital transceiver means and a second modulator having the same data signaling rate as that of said first modulator; providing said second data terminal with a second demodulator capable of synchronizing its data signaling rate with the data signaling rate of said second modulator of said second digital terminal station; originating at either said first data terminal or said second data terminal a data transmission call; establishing a communication link between said first data terminal and said second data terminal through said first and second digital terminal stations; transmitting a series of data signals by said first modulator from said first data terminal to said first digital terminal station during said data transmission call; receiving by said first demodulator the data signals from said first digital terminal; said first digital transceiver means transmitting the data signals from said first digital terminal station to said second digital terminal station during said data transmission call; receiving by said second digital transceiver means the data signals from said first digital transceiver means; and transmitting the data signals from said second digital terminal station by said second modulator to said second data terminal during said data transmission call. - View Dependent Claims (2, 3)
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4. A data communication system, said system comprising:
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a digital communication line; a first and second analog communication line; a first facsimile apparatus connected to said first analog communication line and having first modem means for transmitting facsimile message data at a first data signaling rate and second modem means for transmitting and receiving facsimile control data at said first data signaling rate in one facsimile call; a first digital terminal station connected between said first analog communication line and said digital communication line and having third modem means for receiving said facsimile message data from said first facsimile apparatus, fourth modem means for transmitting and receiving facsimile control data to and from said first facsimile apparatus and digital transmitting means for transmitting the received facsimile message data and facsimile control data through said digital communication line and receiving data incoming through said digital communication line during said one facsimile call; a second digital terminal station connected between said second analog communication line and said digital communication line and having digital transmitting means for transmitting facsimile message data and facsimile control data through said digital communication line and receiving facsimile message data incoming through said digital communication line, fifth modem means for transmitting facsimile message data to said second analog communication line, sixth modem means for transmitting and receiving facsimile control data to and from said second analog communication line; a second facsimile apparatus connected to said second analog communication line and having seventh modem means for said second analog communication line for receiving facsimile message data incoming through said digital communication line at said first data signaling rate and eighth modem means for transmitting and receiving facsimile control data at said second data signaling rate in one facsimile call; wherein at least one of said first and second digital terminal stations includes memory means for temporarily storing a predetermined length of a leading portion of the received series of facsimile message data and control means for initiating the transmission of said facsimile message data after storing said portion. - View Dependent Claims (5, 6, 7)
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Specification