Method and apparatus for communicating signals
First Claim
1. For use in conjunction with a system for producing, at a transmitter location, time division multiplexed frames comprising a plurality of channels of information signals and framing signals, communicating said frames from the transmitter location to a receiver location, and, at the receiver location, deframing the received frames to obtain frame timing signals and a bitstream of information signals which are coupled with a plurality of operating units, a method comprising the steps of:
- at said transmitter location, inserting a preselected pattern of bits in a timeslot of said information signals;
at said receiver location, detecting, in the deframed bit stream, the absence of the preselected pattern of bits, and producing a control signal in response thereto; and
producing override information signals that are coupled to said operating units when said control signal is present.
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Accused Products
Abstract
The disclosed technique has application for use in conjunction with a system for producing, at a transmitter location, time division multiplexed (TDM) frames comprising a plurality of channels of information signals and framing signals, communicating the frames from the transmitter location to a receiver location, and, at the receiver location, deframing the received frames to obtain frame timing signals and a bitstream of information signals which are coupled with a plurality of operating units, for example teleprotection units. A technique is disclosed for responding very quickly, upon loss of the TDM signal, to prevent misoperation of the operating units, including the following steps: at the transmitter location, inserting a preselected pattern of bits in a timeslot of the information signals; at the receiver location, detecting, in the deframed bit stream, the absence of the preselected pattern of bits, and producing a control signal in response thereto; and producing override information signals that are coupled to the operating units when the control signal is present.
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Citations
20 Claims
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1. For use in conjunction with a system for producing, at a transmitter location, time division multiplexed frames comprising a plurality of channels of information signals and framing signals, communicating said frames from the transmitter location to a receiver location, and, at the receiver location, deframing the received frames to obtain frame timing signals and a bitstream of information signals which are coupled with a plurality of operating units, a method comprising the steps of:
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at said transmitter location, inserting a preselected pattern of bits in a timeslot of said information signals;
at said receiver location, detecting, in the deframed bit stream, the absence of the preselected pattern of bits, and producing a control signal in response thereto; and
producing override information signals that are coupled to said operating units when said control signal is present. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. For use in conjunction with a system for producing, at a transmitter location, time division multiplexed frames comprising a plurality of channels of information signals and framing signals, communicating said frames from the transmitter location to a receiver location, and, at the receiver location, deframing the received frames to obtain frame timing signals and a bitstream of information signals which are coupled with a plurality of operating units, an apparatus, comprising:
- at said transmitter location, means for inserting a preselected pattern of bits in a timeslot of said information signals;
at said receiver location, means for detecting, in the deframed bit stream, the absence of the preselected pattern of bits, and for producing a control signal in response thereto; and
means for producing override information signals that are coupled to said operating units when said control signal is present. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
- at said transmitter location, means for inserting a preselected pattern of bits in a timeslot of said information signals;
Specification