Dual 4-wire analog data multiplexer
AssigneeRaychem Corporation
InventorsNicholas A. Balatoni, Tom Blackburn, C. David Dow
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Abstract
An improved method and apparatus for transmission of dual 4-wire analog data services between a telephone company location and a subscriber premises over a single twisted pair, providing a 4:1 pair gain. In a preferred embodiment the invention provides for method and apparatus for transmission of multiple analog data signals for dual 4-wire analog data services over a single twisted pair from telephone company equipment to a subscriber, using 2B1Q or 4B3T digital signals.
Claims13
A method for providing dual 4-wire analog data services between a telephone company location and a customer premises over a ingle twisted pair, said method comprising:
- at the telephone company location
- converting two downstream analog data signals into a downstream multiplexed binary signal and converting an upstream multiplexed binary signal into two upstream analog data signals;
- converting the downstream multiplexed binary signal and the upstream multiplexed binary signal to a digital encoded signal, wherein the digital encoded signal is selected from a group consisting of 2B1Q and 4B3T signals;
- transmitting the digital encoded signal over said single twisted pair between the telephone company location and the customer premises;
- and
- at the customer premises
- converting the digital encoded signal into the downstream multiplexed binary signal and the upstream multiplexed binary signal;
- and
- converting the downstream multiplexed binary signal into two downstream analog data signals for use by two 4-wire analog data circuits at the customer premises and converting two upstream analog data signals from said two 4-wire analog data circuits at the customer premises into the upstream multiplexed binary signal.
Apparatus for providing dual 4-wire analog data services between a telephone company location and a customer location over a single twisted pair, said apparatus comprising:
- a) a remote terminal for use at the customer location, said remote terminal comprising:
- i) a remote terminal IECQ for converting a digital encoded signal on said single twisted pair to multiplexed binary signals;
- ii) a remote terminal ICC coupled to said remote terminal IECQ for adding and removing control information to and from the multiplexed binary signals;
- and
- iii) a remote terminal SICOFI coupled to said remote terminal ICC for converting multiplexed binary signals from and to said remote terminal IECQ to and from four analog data signals for use in two 4-wire analog data circuits coupled to said remote terminal SICOFI;
- b) a central office terminal comprising:
- i) a central office terminal SICOFI for converting four analog data signals at a telephone company location to and from multiplexed binary signals;
- ii) a central office terminal ICC coupled to said central office terminal SICOFI for adding and removing control information to and from multiplexed binary signals from said central office terminal SICOFI;
- and
- iii) a central office terminal IECQ coupled to said central office terminal ICC for conversion of multiplexed binary signals to digital encoded signal for transmission over said single twisted pair;
- and
- wherein the digital encoded signal is selected from a group consisting of 2B1Q and 4B3T signals.
In a system for transmission of a single analog signal from a telephone company location to a subscriber location over a single twisted pair, a method of converting said system to a system for multiple analog data signal transmission over said single twisted pair comprising:
- a) installing a central office terminal at said telephone company location, said central office terminal:
- i) inputting multiple downstream analog data signals from telephone company equipment and outputting multiple upstream analog data signals to said telephone company equipment;
- ii) converting said multiple downstream analog data signals and said multiple upstream analog data signals into a digital encoded signal for transmission over said single twisted pair between the telephone company location and the subscriber location;
- and
- b) installing a remote terminal at said subscriber location, said remote terminal:
- i) converting said digital encoded signal from said single twisted pair into the multiple upstream analog data signals and the multiple downstream analog data signals;
- and
- ii) transmitting said multiple downstream analog data signals to multiple 4-wire analog data circuits and receiving said multiple upstream analog data signals from said multiple 4-wire analog data circuits.
Dependencies are inferred from the claim text.