DETAILED DESCRIPTION The object of the present invention is to provide a monitoring apparatus, as particularly set forth above in the introductory portion, such that trouble reports are collected in an optimally-economical manner and, in addition, further criteria regarding the quality of the monitoring transmission facilities can be kept ready for interrogation as needed.
According to the present invention, the above object is achieved in a system of the type set forth above which is particularly characterized in that the monitoring is provided with an evaluation and memory device, and in that measured values periodically acquired by way of the evaluation device and edited are registered step-by-step with the assistance of the memory device such that the memory contents are cyclically overwritten.
All, or only particularly urgent trouble reports, can thereby be supplied to the signal collecting device.
Under given conditions, the memory device can store trouble reports in addition to the measured values and maintain such reports for a potential interrogation.
A microcomputer preferably serves as an evaluation device which interprets the collected information in view of the data to be registered.
In particular, the measured value can be code errors, losses of synchronism, noise levels or the like.
Measuring apparatus which can potentially undertake a preprocessing of raw data or, respectively, of original measured values, are provided for these measured values in the devices to be monitored.
The measured values can be compared to prescribed limit values in the devices and/or in the evaluation and memory devices in order to form trouble reports.
Urgent or less urgent alarms can thereby be discriminated.
Deriving, due to these measures, is the advantage that, in addition to trouble report information, further criteria can be collected in a particularly economical manner in communications transmission facilities having a plurality of structural units and can be kept on hand for potential, further evaluation, these providing more information concerning the transmission quality of the monitored transmission facilities
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Multiplexer-related 
