Phantom data link for digital transmission lines
First Claim
1. In telecommunications transmission facilities, said facilities including a central office, a network interface unit, and two pairs of cables therebetween, said central office transmitting to and receiving from said network interface unit payload data and performance monitoring data over said pairs of cables and including a simplex lead for each of said two pairs of cables, said network interface unit also receiving from and transmitting to said central office payload data and performance monitoring data over said pairs of cable and including a simplex lead for each of said two pairs of cables, and a data link, comprising, in combination:
- a central office interface, interconnected between said simplex leads in said central office, for sending and receiving payload data and performance monitoring data; and
a performance monitoring link, interconnected between said simplex leads in said network interface unit, for sending, simultaneously, payload data and performance monitoring data to said central office interface.
6 Assignments
0 Petitions
Accused Products
Abstract
An out of band data link for performance monitoring information using existing telecommunications transmission facilities. The Bell telephone network includes a variety of central offices and network interface units that should communicate with each other regarding performance. The data link allows the network interface unit to advise the telephone company'"'"'s central office of difficulties. A first modem is interconnected between a pair of simplex leads in the central office telephone company'"'"'s central office repeater transformers, and a second modem is interconnected between a pair of simplex leads in the network interface unit'"'"'s transformers. The voltage between each pair of leads is used to effect communication between the telephone company'"'"'s central office and the network interface unit. Accordingly existing cables can continued to be dedicated to the transmission of payload, rather than requiring the capacity of the cables to be reduced so that the network interface unit can transmit performance data to the central office.
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Citations
18 Claims
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1. In telecommunications transmission facilities, said facilities including a central office, a network interface unit, and two pairs of cables therebetween, said central office transmitting to and receiving from said network interface unit payload data and performance monitoring data over said pairs of cables and including a simplex lead for each of said two pairs of cables, said network interface unit also receiving from and transmitting to said central office payload data and performance monitoring data over said pairs of cable and including a simplex lead for each of said two pairs of cables, and a data link, comprising, in combination:
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a central office interface, interconnected between said simplex leads in said central office, for sending and receiving payload data and performance monitoring data; and a performance monitoring link, interconnected between said simplex leads in said network interface unit, for sending, simultaneously, payload data and performance monitoring data to said central office interface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 13, 14, 15, 16, 17)
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11. A method of transmitting and receiving data alone telecommunication facilities, wherein said transmission facilities include a central office, a network interface unit, and two pairs of transmission cables there between, each of said pairs of cables being interconnected in said central office to a simplex lead and each of said pairs of cables being connected in said network interface and to a simplex lead, the method comprising the steps of:
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applying a central office performance test signal between said simplex lead in said central office; and detecting said central office performance test signal between said simplex leads in said network interface unit; wherein said central office performance test signal is applied at said central office and detected on said simplex leads at said network interface unit imultaneously with the transmission of payload data. - View Dependent Claims (12)
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18. In telecommunications transmission facilities, said facilities including a central office, a network interface unit, and two pairs of cables therebetween, said central office transmitting to and receiving from said network interface unit payload data and performance monitoring data over said pairs of cables and including a simplex lead for each of said two pairs of cables, said network interface unit also receiving from and transmitting to said central office payload data and performance monitoring data over said pairs of cable and including a simplex lead for each of said two pairs of cables, and a data link, comprising, in combination:
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a central office interface, interconnected between said simplex leads in said central office, for sending and receiving payload data and performance monitoring data; and a performance monitoring link, interconnected between said simplex leads in said network interface unit, for receiving, simultaneously, payload data and performance monitoring inquiries from said central office interface.
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Specification