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US 2004/0114510 A1Published application
Remote terminal multiplexer/de-multiplexer having protection bus
OwnerFrank W. Miller, Winston Maxon Gadsbyinventors
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Abstract
A information signal multiplexer/de-multiplexer having application in environmentally uncontrolled remote terminals is described with line interface card redundancy capability.
Claims16
An information signal multiplexer/de-multiplexer, comprising:
- a line interface card adapted to receive a plurality of information signals and multiplex the plurality of information signals into a transmission information signal;
- a packet interface card adapted to receive the transmission information signal from the line interface card and communicate the transmission information signal via an IP Network;
- a main bus connecting the line interface card with the packet interface card;
- a control unit monitoring and controlling operation of the line interface card and the packet interface card;
- a redundant line interface card connected to the line interface card, wherein the plurality of information signals is switched from the line interface card to the redundant interface card upon detecting a failure condition;
- wherein circuitry forming the line interface card, the packet interface card, and the control unit are environmentally hardened to reliably operate over a temperature range of from −40° to +65° C.
3 more elements
A control method for an information signal mutliplexer/de-multiplexer, wherein the mutliplexer/de-multiplexer comprises a control unit, line interface card receiving a plurality of information signals, and a redundant line interface card connected to the line interface card via a protection bus, the method comprising:
- monitoring failure conditions;
- processing the plurality of information signals in the line interface card until detecting a failure condition;
- upon detecting a failure condition, communicating a failure signal to a logic circuit on the line interface card;
- seizing control of the protection bus in response to the failure signal;
- actuating a switching circuit on the line interface card to communicate the plurality of information signals to the redundant line interface card via the protection bus.
2 more elements
Dependencies are inferred from the claim text.