DE2040142B2 - CIRCUIT ARRANGEMENT FOR MEASURING AND DISPLAYING THE AVERAGE OCCUPATIONAL DURATION OR LOADING OF CENTRAL DEVICES IN REMOTE SIGNALS, IN PARTICULAR TELEPHONE SWITCHING SYSTEMS - Google Patents

Description

The invention relates to a circuit arrangement for measuring and displaying the average occupancy time or, alternatively, the load on central devices in telecommunications, in particular telephone switching systems, in which the measured values in the form of impulses of different lengths to the inputs of the market value measuring device are given.

The central devices to be monitored include tax rates, Markers, allocators, touch-sensitive receivers, MFC receivers, allocators, registers, etc. The Average occupancy times for these devices can range from 10 microseconds to 25 seconds be. To cover such a large measuring range, it is from the general Measurement technology known to subdivide the entire measuring range into several partial measuring ranges. Since a traffic measuring device in a known manner several measuring devices for a measurement of the types mentioned used at the same time and the result of these devices with each other linked, the use of these known multiple measuring devices is very cumbersome here and can lead to incorrect measurements due to incorrectly set devices. Aggravating there is also the fact that not all required devices are switched to the same extent must be, because for each measurement different partial measuring ranges are individual to adjust.

In the case of the known measurement, the mean occupancy time is determined by Reading two counters, namely one counter that shows the entire occupancy of a to be observed switching element measures, and a second counter that the number of Assignments are counted, and an immediate one is formed by dividing the two counter values Read or record the current mean or the last determined mean Occupancy time is not provided.

The object of the invention is to specify a circuit arrangement, with the help of which either the average occupancy time or the load of central ones Devices is measured and displayed, with the mean - occupancy time of the to be observed - zefttral devices to an extent of over six decades of the Time unit can change.

It should be possible to read or register the values directly. aside from that the measured values should be output with sufficient accuracy depending on their order of magnitude, without having to switch over a large number of measuring devices individually in their measuring range must become. The entire - traffic measuring device - should be as simple as possible and with be built with little effort.

This is achieved with the circuit arrangement according to the invention in that the input circuit provided with an input selection switch from the central device to be monitored and from a clock generator with several, Outputs delivering different time cycles receive incoming pulses via a first AND circuit is supplied to a first counter that can be set in its reduction ratio that is used to measure both the mean occupancy time and the load it can be used that the pulses coming from the input circuit are simultaneous get to a second counter adjustable in its reduction that the result of the first meter about the type of measurement (average occupancy time or Load) determining switch in a second AND circuit with either the Output pulses of the second counter or with another of several of the Outputs of the clock coming clocks are linked that the output the second AND circuit via a digital-to-analog converter with an indicating and / or a recording device is connected, and that when setting of the input selection switch of the input circuit to the pulses to be observed at the same time the switches for pulse scaling in the counters to select the Time cycles and, if necessary, to select the type of measurement are operated.

By having each of the counters and each input of the AND circuits have switches coming from the clock, which from the input selector switch at its actuation can be controlled, and the switch may also be used at the same time is pressed to select the type of measurement, the person measuring does not need to be more to worry about which switch in the intended measurement in which Switch position must be brought. In this way, setting errors are excluded, and the adjustment work is reduced to a few simple steps. As with the input selector switch the traffic measuring device is set to a specific central device, whose properties are known, the measuring range is selected so that the measured values be output with sufficient accuracy.

The first counter, which measures the total occupancy time, and the second Counters, which determine the number of occupancies, give their impulses to an AND circuit away. In this the two measurement results are linked so that the Measured value of the mean occupancy time immediately without additional arithmetic operations can be displayed or registered. This also simplifies the work of the measurer.

The value of the total occupancy time is used to determine the mean Occupancy time and also required for the load measurement. The circuit arrangement according to the invention therefore provides that the first counter and the AND circuit at the output of this counter can be used for both measurements and the other for the device required for each measurement can be switched on as required. That has the advantage that the effort remains as low as possible, if not both measurements must be done at the same time.

The invention is explained in more detail with reference to the drawing.

The traffic measuring device for measuring and displaying the middle Occupancy time or the load on central devices has an input circuit E with a number of inputs. There is a different central one at each of the entrances Device - switched on, - the different observation times and, if applicable also requires a different type of measurement. A switch S3 of the input circuit E ensures that the object to be observed is connected to the output of the input circuit E is connected.

On the one hand, this output is the input of an AND circuit U1, on the other hand, the input of a counter Z 2 is connected.

The counter Z2 contains a multi-stage switch S2 with which the Measuring range of this counter is set.

A clock generator G controls a clock generator T, which has a time grid generated with different time values in a known manner. These values, for example 1, 10, 100, 100O microseconds, are set with switch S5 and other values, for example 10 seconds and 15 minutes, tapped with switch S6.

The switch S5 is connected to a second input of the AND circuit U1 connected, the output of this circuit leads to a counter. This counter contains a switch S1, which can also be used to switch between ranges will.

The switches S1 and S2 of the counters Z1 and Z2 work in the way that further counting decades are switched on or off to receive the pulses to be counted will. In this way, for. B. the area of the counter Z1 between a reduction ratio from 10: 1 and 10: 1, with counterZ2 between 10e 1 and 106: 1.

The output of the counter Z1 is connected to an input of the AND circuit U2 connected. The other input of this AND circuit can be switched with switch S4 either to the output of the counter Z2 or to the switch S6 of the timer T.

The output of the AND circuit U2 is via a digital-to-analog converter DA connected to a measured value output device A, the measured value in a known Way, displays, writes, prints or otherwise registers.

The switches S1, S2, S5, S6 and possibly S4 and / or S7 are coupled to the switch S3 such that when setting the latter Switch S3 to a certain type of central devices the associated measuring ranges the counter and the required cycle of the timer T can be set. Even the measuring mode switch S4 and the measured value unit switch S7 can be used with this Be coupled to the switch.

This coupling assumes that each of the inputs of the input selector switch S3 with central devices of the same or similar type Kind is connected, which can be expected to have approximately the same measured values, but only one single device is observed at the same time. But if the inputs of the Input circuit E can be provided for universal use, so that at everyone Any of the central devices can be connected to the inputs, then only switches S1, S2, S5, S6 and possibly S4 and S7 are switched together.

In order to measure the average occupancy time of a central device, the input selector switch S3 is first set to the expected measuring range of the connected device.

The counter Z2 is incremented for each occupancy. At the same time, an occupancy pulse appears at an input of the AND circuit U1.

As long as the occupancy lasts, clock cycles of the Clock T via the switch S5 to the other input of the AND circuit U1 and switch this briefly permeable, so that the counter Z1 by one Step forward.

When the average occupancy time of the central device is measured the switch S4 is in the position shown. As it is at this What matters is the total occupancy time during a certain number of times of allocations to be determined, which is counted by the counter2, and that of the counter Z 1 counted impulses correspond to the total occupancy time, is reached when the number of pulses set in counter Z2 opens the AND circuit U2 and the The number reached by the counter Z 1 is accepted in the digital-to-analog converter DA.

Only one AND circuit U2 appears in the drawing; with a binary or multi-digit counting, a corresponding number of such AND circuits are used, all of which can be opened simultaneously by counter Z2.

The digital-to-analog converter DA records and stores the measured values if necessary for a certain time and sends them to the measured value output device A where they are displayed and / or registered. The measured value output or the recording process then takes place at time intervals that are set via switch S4 either from the clock T or from the counter 22 can be determined.

To measure the load is the sum of all during a given Observation interval accumulating occupancy times to form. This addition takes place as already described, in the counter Zi.

The switch S4 is, however, in the other position than in shown in the drawing. After the time set by switch S6 has elapsed the counter Z1 is read out again, as already described, and the result is displayed and / or registered.

The measured value output device A contains, just like the counters Z1 and Z2, a switch S7, which at the same time with the measuring range changeover with is operated. This switch controls a calculator that outputs the value multiplied by a corresponding factor or the decimal place accordingly shifts so that the displayed and / or registered value is equal to the correct one Units appears.

The counters Z1 and Z2 also have additional contacts, which are activated when the counter overflows. About these additional contacts if necessary, counting decades are switched on or off or the time cycle is changed, d. H. the measuring range switched automatically, if it should turn out, that he was not chosen correctly. This can be the case, for example, if the counter Z1 is already full when measuring the average occupancy time and therefore overflows while the counter Z2 has not yet reached its set end value has reached.

Claims (5)

Patent claims: 1. Circuit arrangement for measuring and displaying the average occupancy time or alternatively the load on central devices in telecommunications, in particular telephone exchanges, in which the measured values are sent to the inputs in the form of pulses of different lengths the market value measuring device, characterized in that the over an input circuit (E) provided with an input selection switch (S3) from the central device to be observed and that of a clock generator (T) with several, outputs delivering different timing cycles incoming pulses A first AND circuit (U 1) is used to set a reduction ratio (p 1) the first counter (Z 1) is supplied for measuring both the middle Occupancy time as well as the load can be used that of the input circuit (E) impulses coming at the same time to one adjustable in its reduction ratio (S2) second counter (Z2) get that the result of the first counter (Z 1) over a switch that determines the type of measurement (average occupancy time or load) (54) in a second AND circuit (U2) either with the output pulses of the second Counter (Z2) or with another of several from the outputs of the timer (T) coming clocks are linked to the output of the second AND circuit (U2) via a digital-to-analog converter (DA) with one indicating and / or one recording device (A) is connected, and that when setting the input selection switch (S 3) the input circuit (E) on the pulses to be observed simultaneously the Switch (S1, S2) for pulse reduction in the counters (Z 1, Z 2) to select the Time intervals (SS, S6) and, if applicable to select the type of measurement (54) actuated will. 2. Circuit arrangement according to claim 1, characterized in that Switching over the measuring range of the counters (Z1, Z2) by switching on or off Counting decades and / or by changing the time cycle. 3. Circuit arrangement according to claim 2, characterized in that the counters (Z1, Z 2) are equipped with additional contacts, which in case of overflow this counter automatically switches over the measuring range. 4. Circuit arrangement according to claim 1 or 3, characterized in that that the measured value output device (A) contains a switch (S 7) which simultaneously is activated when the measuring range is switched over and the measured values output displays and / or records in the appropriate units. 5. Circuit arrangement according to claim 1, characterized in that the digital-to-analog converter (DA) is assigned a memory in which the measured values stored and, depending on the type of measurement, either from the counter (Z2) or from the timer (T) controlled time interval (56) can be displayed and / or recorded.