Communications: electrical – Continuously variable indicating – With meter reading
Patent
1990-01-22
1992-11-24
Yusko, Donald J.
Communications: electrical
Continuously variable indicating
With meter reading
34082516, P04Q 900
Patent
active
051666731
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention is directed to a method for controlling and/or monitoring whereby at lest one monitoring unit exchanges information with processor units that are connected to the monitoring unit via a common telegram transmission network and are provided with addresses and whereby polling telegrams of the monitoring unit and reply telegrams of the processor units are transmitted.
Such a method is already disclosed by German Published Application 34 36 414. In the known method, the addresses are set with the assistance of coding switches.
A method for in-service monitoring of a communication transmission equipment wherein useful signals are transmitted via an electrooptical transmission link and telemetry signals are transmitted via an auxiliary channel 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.
The known method uses address-free telemetry telegrams, so that the processor units provided in the line terminal equipment and intermediate repeaters of a transmission section need not be addressed. The method, however, can not be employed without further ado in communication transmission equipment that have a star or, respectively, tree structure. When processor units that are called under address control by a locating unit in cyclical succession are provided in the appertaining telemetry means in a communication transmission network having star or, respectively, tree structure, then a structure corresponding to the useful signal network can also be provided for the telegram transmission network of the telemetry means.
This is also true of equipment for distributing electrical energy or the like that are to be monitored with the assistance of a remote control means.
SUMMARY OF THE INVENTION
It is an object of the invention to specify a method and a circuit arrangement for the implementation of the method that allow disadvantageous effects of disturbances in the telegram transmission network to be kept as small as possible. In particular, it should thereby be possible to localize the location of, in particular, brief-duration disturbances. The method and the circuit arrangement should be preferably suitable for an especially reliable in-service monitoring of communication, preferably digital signal transmission links.
For achieving this object, the method of the invention provides the method steps as follows: for at least one part of the processor units, telegrams of at least one transmission direction are conducted via a transmission unit that through-connects the telegrams without intermediate storage in a first transmission mode and, in a second transmission mode, forwards the telegram after intermediate storage and checking only when it is found that given demands are satisfied; and a respective switch from the first to the second transmission mode is undertaken as soon as the check in the appertaining processor unit finds that a through-connected telegram does not satisfy the given demands.
The method of the invention allows a repeated forwarding of disturbed telegrams to be prevented without the cycle time during normal operation being lengthened.
Advantageous developments of the method as well as expedient circuit arrangements for the implementation of the method are as follows:
The switching of the processor units form the second into the first transmission mod is respectively initiated by a control instruction of the monitoring unit. The processor units that have switched into the second transmission mode report the new mode in the reply telegram following the switching and report the appertaining transmission direction to the monitoring unit.
The monitoring unit, following a message that a processor unit has switched into the second transmission mode, cyclically calls the processor units beginning with the processor unit that lies closest to the monitoring unit and thereby respectively switch
REFERENCES:
patent: 4279034 (1981-07-01), Baxter
patent: 4498082 (1985-02-01), Aldridge et al.
patent: 4660201 (1987-04-01), Nakamura
"Supervision & Additional Services For Digital Fiber-Optic Transmission Systems" Braun et al., telcom report 10 (1987) Special Multiplexing and Line Transmission, pp. 107-112.
Herrmann Karl
Narjes Ferdinand
Steiner Erhard
Weimert Guenter
Holloway III Edwin C.
Siemens Aktiengesellschaft
U.S. Philips Corporation
Yusko Donald J.
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