Communications: electrical – Continuously variable indicating – With meter reading
Patent
1990-10-22
1993-12-28
Yusko, Donald J.
Communications: electrical
Continuously variable indicating
With meter reading
3408258, 379200, 370 131, 370112, H04Q 100
Patent
active
052743675
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention is directed to a device for inservice monitoring of communication transmission equipment that contain at least one transmission link having two line terminal equipment between which one or more intermediate locations may be provided. Also provided is a monitoring unit that exchanges information via at least one telemetry channel with processor units that are allocated to monitored local ends and/or intermediate locations.
Such a device is already known from Ewald Braun and Erhard Steiner, "Supervision and Additional Services for Digital Fiber-Optic Transmission Systems" telcom report 10 (1987) Special "Multiplexing and Line Transmission", pages 107 through 112.
In the known device for in-service monitoring of a communication transmission equipment, useful signals are transmitted via an electrooptical transmission link and telemetry signals are transmitted via an auxiliary channel. The device uses address-free telemetry telegrams, so that the processor units provided in the line terminal equipment and intermediate repeaters of a transmission link need not be addressed. The method, however, cannot be employed without further ado in communication transmission equipment that have a star or, respectively, tree structure.
SUMMARY OF THE INVENTION
It is therefore an object of the invention to create a device that allows branched communication transmission equipment to be monitored.
A structure that corresponds to the useful signal network thereby derives for the telegram transmission network of the telemetry means. Processor units that are polled by the monitoring unit in cyclical succession under address control can thus be provided in the telegram transmission network of the appertaining telemetry means in a communication transmission network having star or, respectively, tree structure.
The device for achieving this object has the following elements: the processor units are provided with addresses; and the monitoring unit comprises a means for transmitting polling telegrams that contain addresses to the processor units and comprises a means for receiving a reply telegram of the processor unit that is respectively called; and the communication transmission equipment contains a plurality of processor units at at least one location, these being connected to one another via a data bus that connects the telemetry channels of a plurality of transmission links to one another.
What derives in communication transmission equipment that form a communication transmission network composed of line sections and wherein the line sections each respectively comprise a telemetry channel on the basis of these measures is the advantage that a telemetry network having the desired configuration can be created with the assistance of identical devices.
Advantageous developments of the invention are as follows. The data bus connecting the processor units can be a bidirectional bus for half-duplex operation. The processor unit contains at least one input/output for the connection of a four-wire telemetry channel and contains at least one input/output for the connection of the data bus and contains a switching equipment that, upon receipt of data at the input of one of the input/outputs in a quiescent condition, forwards and received data to the outputs of the other inputs/outputs.
An OR element or an exclusive-OR element precedes the output at each of the inputs/outputs of the processor unit and two inputs of the OR element or, respectively, exclusive-OR element are connected to the inputs of the two other inputs/outputs.
The output at each of the inputs/outputs of the processor unit is connected to a data output of a microprocessor and upon reception of data at the input of one of the inputs/outputs, the microprocessor forwards the received data to the outputs of the other inputs/outputs.
The output at each of the inputs/outputs of the processor unit is connected to a data output of the microprocessor and given reception of data on at least two inputs of the inputs/outputs, the microprocess
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"Supervision & Additional Services for Digital Fiber-Optic Transmission Systems" by Braun et al, telcom report 10 (1987) Special Multiplexing and Line Transmission pp. 107-112.
Herrmann Karl
Narjes Ferdinand
Steiner Erhard
Weimert Guenter
Siemens Aktiengesellschaft
U.S. Philips Corporation
Yusko Donald J.
Zimmerman Brian
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