Importance

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Abstract

In a routing system used in each of exchange stations of a data communication network and including trunk terminator groups physically terminating transit trunks to receive incoming signals and send outgoing signals and route selectors for selecting an alternative route, a switch switches the incoming signals into switch output signals and, into the outgoing signals, switch input signals transmitted through the route selectors. Frame relay communication controllers process, into processed signals, the switch output signals conveyed through the route selectors and controlled signals into the switch input signals. A frame relay procedure processor processes the processed signals into relay output signals and relay input signals into the controlled signals and locate a faulty trunk transmitting a fault for superposition on the relay output signals during presence of the fault, to control the switch and to put the route selectors into operation. Connected to the faulty trunk by the switch during presence of the fault, a monitor/controller restores the fault. An input/output device processes the relay output signals into reception data signals and transmission data signals into the relay input signals. Processing the reception data signals into input data signals for X.25 terminals, each communication control section suspends processing of output data signals into the transmission data signals during presence of the fault for retransmission as soon as the fault is restored. At least two trunk control sections may be connected to the input/output device.

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First Claim