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Phantom data link for digital transmission lines

  • US 5,555,274 A
  • Filed: 03/02/1992
  • Issued: 09/10/1996
  • Est. Priority Date: 03/02/1992
  • Status: Expired due to Term
First Claim
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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:

  • 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.

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