DE2044001B2 - DEVICE FOR REMOTE MONITORING OF THE OPERATING STATUS OF MESSAGE TRANSMISSION DEVICES - Google Patents

Description

The invention relates to a device for remote monitoring of the operating status of message transmission devices, in particular low-frequency transmission devices for data transmission, with pilot-monitored and switchable multiple connections at least in some of the transmission sections, in which at least one end of a transmission section has criteria for the operating status of this point and / or derived from the incoming transmission section and transmitted to the remote station below the frequency band provided for the message transmission, the station containing at least one pilot signal generator with a frequency below the message transmission band to be transmitted and in the remote station depending on the received pilot tones control and / or display criteria are formed.
It is from German patent specification 1,069,198

If a multichannel transmission system with a selection channel is already switched off, the switching devices will switch blocking in the event of a fault, and that with one will switch to the second operational channel.
Pilot monitoring device is provided, which is used for monitoring the operating channel and for disturbances occurring in only one transmission. Pilot tone fed in. A pilot lock is inserted before the pilot lock-in and a dial lock in the assigned dial feed point. The mediation causes. Line amplifiers amplify the low-frequency band in the opposite direction to trigger occupied channels band so that the attenuation of the resistance fork and dialing blocking of the dialing switching of the io to split the transmission band in both opposite directions takes place. In this multi-channel transmission, individual channels and the pilot lock is compensated. system is intended to apply ground potential to the signal wire. In the receiving terminal, the connection is to be applied in the reverse direction of the carrier frequency channel seen for the feedback before the switchover device after the switchover. This point by a first pilot receiver constantly continuous signal is monitored in the carrier frequency device of the Aus 15 for operational readiness. Receives all converted into a direct current, with which this pilot receiver has no pilot level or a pilot level below the cutoff threshold for the disturbed carrier frequency group, then the associated selective transmissions are blocked. Pilot evaluation then switches the switch on if it is still from the German interpretative document the second pilot that concludes the second way ■; 297 152 already has a circuit arrangement for the self-receiver that the pilot receives and thus enables the substitute circuit in a message or circuit.

1-ernoperungsnetz known, in which in addition to the un · Furthermore, in the previously known device there is a

:; used operating status and always provided with a display that shows which

Signals acted upon control paths, each station of the two paths is switched through and whether the pilots

■ can be received in advance at least by means of one in addition to the control paths. The error messages can

existing alternative route with a neighboring station also via a remote monitoring device.

is bound. In this circuit arrangement is to be conducted. On the other hand, in the event of a pilot failure

provided that in the event of a fault, a station in the second way in the receiving terminal of the for

Neighboring station supplies a continuous signal, which there both lines common pilot generator briefly

the through-connection of the line branch arriving must be switched off in good time. The result on both

the direction of the substitute path. This signal caused brief pilot failure triggers

the message »Error

System. in the remote station «. The remote station can then

It is finer z. B. be unmanned from the German patent.

1002 033 an automatic switching arrangement for 35 with the help of such a switching device a message transmission system is known in which, in many cases, a high level of operational reliability can be achieved a common spare channel two or more over- for the transmission of low frequency bands transmission channels is assigned and achieve a rapid turnaround. Difficulties can arise as a result, however switching of the channels should take place in the event of a fault. show that with the brief interruption of the In this switching arrangement it is provided that 40 pilot tones are generated. You can Switching signal that identifies a channel for a disruption of the data transmission band every transmission channel is different and inside avoid disturbing the frequency spectrum of the half of a frequency range below the signal-keyed pilot tone on the part of the transmission frequency range. This identification signal area below the data transmission band is limited to the inputs of the transmission channels in the 45. In this case, however, the pulse pause corresponds Switching section, which sets limits in the proportion of the pilot being keyed, so that direction transmits, impressed and in this way in many cases a sufficiently fast one via these channels transferred to the beginning of the switching section where message is not possible. Should be with such a it actuates the control device at the transmitter end. Setup also by noise or interference-off of Siemens-Zeitschrift, Volume 43, February 50 voltage-disturbed transmission channels found 1969, Issue 2, pp. 98 to 100, is already a facility, so this cannot easily be done by the dated Fre low-frequency level detected for substituting communication channels in the frequency spectrum of the sampled pilot known, in the case of an automatic quenzbereich, but only part of the data over-Umschahung a receiving device can be used by a carrying strap itself. Through this disturbed transmission channel to another 55, however, the actual one is curtailed operational transmission channel is provided. Message transmission band, the most ver-Such Facilities are used for particularly important ones should be avoided.

Connections are provided in which individual channels, the object of the invention is therefore to create a device in the low-frequency level (300 to 3400 Hz) as a replacement of the type specified above, which are to be switched. This is e.g. For example, in the case of post-60 the difficulties outlined with directing channels as possible for regulating, controlling and measuring the little effort are avoided.
Case such as those required for oil or gas transport along pipelines for the It is from the German Auslegeschrift 1 026 364. a message transmission system is already known. For increased operational safety of such individual channels, at least one monitoring frequency that is independent of one another is created from one terminal to the other, and that is transmitted. Because if the jointly switched connection is interrupted, the continuous oversides are constantly monitored on their receiving transmission path. If the respective operating load of the monitoring frequency is interrupted

On the other hand, in many cases the noise level increases many times over with one pilot receiver for each pilot received, this can lead to the fact that one group is blocked together with the monitoring receivers blocked one line, the other group jointly with and thus the presence of the other line can be connected by the noise and that the monitoring frequency is simulated. There 5 gears of the pilot receiver to an evaluation device is therefore provided a special test channel, which are guided, which are assigned as switching criteria to the means that when reaching a little - failure of all pilot tones on one and the same at least one of the monitoring receivers blocks - reports incoming line ,
the input noise level from this one can be used for at least one of the groups

cause the alarm to be sent. 10 of pilot receivers the outputs of the pilot receivers

However, there are applications in which one leads and receives inputs of an OR gate In this way, a special test channel is not readily available for each one of the criteria for the state fortune stands. one of the incoming lines.

According to the invention, the device is carried out in such a way by the two further pairs with each

designed so that the signals can be switched on and off smoothly at least two pilot receivers of the same frequency Bare pilot continuous tones are that depending on what is to be distinguished in one of the pairs the outputs to an OR operating state a separate frequency or in itself gates, so criteria can be set in a simple way As is known, create your own combination of Fre- for the outgoing lines. Farther sequences is sent out and that an evaluation can be sent to the OR gate and an AND gate of the noise spectrum or noise evaluation in part 20.

of the transmission band below the message In a further embodiment of the invention, the

Transmission band with the exclusion of the pilot tones device designed so that the output of the takes place, in particular for the purpose of the equivalent switching crosspoint depending on the position of a multi-pole with disturbed transmission channel by blocking the switch, its contacts together with the associated pilot receiver. Before the 25 crosspoints can be operated, the pilot tones are filtered out with one or the noise evaluation from the frequency to be evaluated; the other group of pilot receivers is connected to the frequency band. It is also possible to evaluate the group separated from the output of the coupling point from the pilot frequencies themselves or their beats in each case with the through the coupling evaluation. The message transmission band that is separated from the receiving device can be used, in particular, that is connected to the low-frequency data transmission channel.
usual frequency band 360 to 3400 Hz It has proven to be particularly useful to

to serve. that as a message transmission band the frequency

Through these measures, according to which in addition to the band 360 to 3400 Hz and as a frequency band for the actual message transmission band only single noise evaluation the range 300 to 360 Hz is used, frequencies need to be transmitted, gives 35. The pilot frequencies are more practical the advantage of having filters to suppress 300, 320 and 340 Hz.

Sidebands saved and a noise evaluation. The invention is illustrated using one of the FIGS. 1

are made possible without additional frequency requirements. and 2 illustrated embodiment in more detail

In a further development of the invention, the device is explained.

device designed in such a way that 40 F i g. 1 and 2 show a juxtaposed Criteria from which in an evaluation device device for remote monitoring after the earth logical linkage of message signals formed.

The terminals I and II are connected to one another via two four-wire lines for switching one of the transmission paths A and B on or off. Pilot generators are used. 45 From the transmitted low frequency band 300 to

Used the device for remote monitoring of the 3400 Hz 360 serves the range up to 3400 Hz for Eigent-operating state of a Vierdrahtübertragungseinrich- loan message, in particular data transmission, processing with a device for the automatic environmental In the terminal I (F i g. I), the from the transmitter 11

switching a receiving device from an incoming line through the high-pass filter 12 with the disrupted transmission channel to a further, in particular, cut-off frequency fg = 350 Hz of interfering frequencies free special operational, transmission channel made with. Then the line is divided into the two aids of a crosspoint, each with a first path A and B. The two amplifiers 13 and 14 pilot generator for the transmission-side feed of one cancel the attenuation of pilot tones resulting from the division in both transmission channels and with two again and decouple the lines A and L of the associated pilot receivers on the receiving 55 from one another. After the amplifiers 13 and 14 wire side, with the help of which interference in the transmission channel switched as the operating channel, the pilot frequency 300 Hz of a generator 15 mi and possibly a level of 2.4Np below the relative level, the operational readiness of the fed in as a substitute channel.

switched transmission channel can be determined and in the other terminal II (Fig. 2) are on

through which the coupling point can be controlled, the 60 incoming lines A and B are connected to the coupling device in a further embodiment of the invention point S1 . The coupling point S1, al so designed that shown in at least one of the end TJmschaltkontakt, connects either two more, each directly through an A or the S line via the high-pass filter 24 with the pilot generators disconnected from the pilot receiver 25 The high-pass filter keeps the pilot frequencies that the first pilot generator is using by means of a 65 away from the receiver.

OR- The two pilot receivers Pa and Ps are controllable by both pilot receivers

Linking in the event of failure of one of the transmission paths, a bandpass filter 27 or 28 is connected upstream, which the Fre it can be switched off that two groups of 300 to 360 Hz pass frequency band in the remote station. Both

Pilot receivers Pa and Pb have reached the contacts S2, circuit a 'of the coupling point S1 and can be connected at S3, S4 to the lines A and B as well as to the faulty operating line A and an intact replacement passage of the coupling point S1. The coupling line B initiates the switchover of the coupling point S1 point S1 and the other contacts S2 to S4 into the other switch position in which they listen to the switch 26 and are jointly connected to the 5 line B as an operating line, ie operated with the . In the switch position shown, the output is connected, and the output of the coupling pilot receiver Pa is connected to the bandpass filter 28 connected in series via the bandpass filter 27 and the point S1 via the switching contact S3 and via contact S3 to the output of the coupling point S1 . The pilot receiver Pa is therefore connected to the pilot receiver Pb .
of the line A, which is switched as the operating line. The AND gate 313 has one input each

The other pilot receiver Pb is connected directly to the output of the negation element 311 and to the output line B via the band to the connection b "of the coupling point S1, the outlet 28 and the contact S4. The connected between the line A of the pilot receiver Pa and is at and the pilot receiver P _A lying contact S2 is at the same time pending input signals to the open. Starting from γοη the position shown, 15 connection b 'is a control signal for switching the when switching the coupling point Sl in the receiver 25 νοη of the line B to line A. off, other position of contact S2 closed, the off when the operating line B is disturbed and the replacement gear of the coupling point S1 is intact with the help of the switchover line A. The coupling point in contact S3 is transferred from the pilot receiver Pa to the pilot switch position, in which the line A receiver Pb switched and the contact S4 20 is connected to the output.
opened. The directly sent from the pilot receivers

Thus, before and after the coupling point S1, the criterion for the operational readiness of the one pilot receiver Pa for the line A and a substitute channel can, if necessary, switch on a pilot receiver P _B for the line B for the switchover. remain unconsidered.

The pilot receiver Pa and Pb monitor to 25 to the evaluation device 31 is also the sign Alden lines A and B incoming pilot tone field connected 32 in which the indicator lamp 321 300 Hz, causing the switching of the formwork interference on the line A and the indicator lamp ters 26 and signaling in the signal field 32 when the ι 322 reports disturbances on line B.
Pilot level in the operating channel below a fixed value falls below ■ In addition, the pilot receiver P _A and P _B and when the protection channel is ready for operation. 30 each with a not shown in the figure

For this purpose, the pilot receiver P _A is provided with a blocking device which connects the pilot receiver and P _{B to} the evaluation device 31 , and switches off when the noise power in the channel that is also provided by the upstream bandpass filter 27 or 28 is controlled by the coupling point S1 will. gets too big.

As criteria for the switching state of the coupling 35 About the designed as an electronic switch point Sl can, for. B. the collector potentials of contacts S2, S3 and S4, the level of the through-transistors of a bistable multivibrator are used, which is monitored as a switched line after and the level of the replacement memory element for storing the coupling point line before the coupling point Sl, and the switching state or for Control of the coupling, however, an individual reinforcement of the pilot point is used. At the coupling point S1 means: * o frequency or the pilot tone for the A and 2? Line

possible. In particular, the pilot receiver

Signal potential at connection a *: M-line is adjustable with the help of an upstream

Operations management «, attenuator on the reception level at the

Signal potential at connection * «:» 5-line is assigned line 'must be set.

Management «. _{45 The end bars} n, _en \ _{and Π are} differently

The control of the evaluation device 31 by built: position I is occupied and position II is not. The criteria that the switching state of the crosspoint occupied point I learns when on the outgoing can report z. B. then be omitted if the evaluation conduit means in the direction towards the unfilled position, an error from an initial position occurs There are three errors to report optionally: of the coupling point switches was registered 50 _{L outgoing} Lej _{tung A} j _st disturbed,
or if one of the transmission channels opposite ₂ . outgoing line B is disturbed,
is preferred to the other. . ,. 3. Both outgoing lines are disturbed.

The evaluation device 31 contains the negation

members 310 and 311 The negation member 310 is if all lines are in order, then in position II

Pilot receiver Pa is connected downstream and, at 55 in the outgoing direction, the 300 Hz pilot tone switches on lamp 321 due to pilot failure on line A. the pilot generator 15 is fed in and at point I the negation element 311 is received by the pilot receiver P _B.

connected downstream and brings the lamp 322 on. The errors are reported back as follows:

light up when the pilot on line B fails. Is, based on point T, in the outgoing direction

Furthermore, the line 60 B destroyed in the evaluating device 31, the pilot AND gate falls in site II 312 and the control contained 313, receiver Pb, switches thereby through the OR signals for switching the cross point Sl member 4 soft the 300 Hz pilot generator 15 aas and deliver. The AND gate 312 is the 320 Hz pilot generator 17 with one. The two 300 Hz PiIotempden output of the negation element 310 and to the 65 catcher Pav » and Pb ₃₀₉ therefore drop in the occupied input to the connection d 'of the coupling point S1, position I; for this, the two outputs of the pilot receiver Pb connected and the 320 Hz pilot receiver P _Att0 and P _{Bxt0 on} . At the output it sends a control signal via the OR gate 317 through the lamp input signals, which at the output 322: * m outgoing direction B-line disturbed «. the

9 10

both switched on pilot receivers jP ^ 32o and Pb ₃₂₀ traps, based on position I, in the incoming

also mean: »incoming direction in the direction of one or both lines fail, then fail

Order". either the three pilot receivers Pa ₃₀₀ . 320, 340 or

If, based on point I, the three pilot receivers Pb ₃₀₀ , 320, 340 or all six fall in the outgoing direction

If line A fails, then in point II pilot receiver Pa 5 pilot receiver drops out. In the former case it switches

off, while the 300 Hz pilot generator 15 softly switches the OR gate 315 via the negation 320 die

off and the 340 Hz pilot generator 16 on. On the signal lamp 325, in the latter case the OR

occupied side I, the two 340 Hz pilot gates 316 speak via the negation 319 of the signal lamp 321

Recipients P ^ ₃₄₀ and Pb ₃₄₀ and register via the.

OR gate 314 through lamp 324: »in ab- 10 The following table shows the relationship

outgoing direction Λ line disturbed «. The two between addressing the pilot receiver in the

switched on pilot receiver P ^ ₃₄₀ and Pß3 ₄ ^{above e} "position I and the associated malfunctions,

also interpret: "incoming direction in order", in the table mean:

Fall, related to position I, in the outgoing direction _ _T. .

both lines A and B are turned off, so 15? inUmg okay

the pilot receivers P _A and Pb and switch under ~ η u ^{S g} «? ο · ι - t-

Switching off the pilot frequency 300 Hz, the two pilot ^{P De} 'relevant pilot receivers

frequencies 320 Hz and 340 Hz softly. In position I ^{in position 1 he} receives P1I0I

speak on the incoming side both at the beginning of the table thus results for the

320 Hz pilot receivers P ^ ₃₂₀ and Pb ₃₂₀ and the 20 300 Hz pilot:

two 340 Hz pilot receivers Pa ₃₁₀ and Pb _mo to The pilot receivers P ^ and P _B receive their

and report via the to the OR gates 314 and 317 Pilot 300 Hz. From this it follows: In incoming and ir

connected AND gates 318 with the help of the lamp of outgoing ■. Direction are the A and di <, respectively

323 the total failure of the outgoing side. B line OK.

P A 300
Pa 300 Pb 300
Pb 300 320Hz Pa 320
Pj4 320 Pb 320
Pb 320 340Hz Pa 340
^ 340 Pb 340
Pb 340 ■ Pb 320
Pb 340 incoming direction
Α line | B line O
O
L.
L. O
L.
O
L. outgoing
A line direction
B line 300Hz 320 Hz and 340 Hz Pb320 I. Pa 340 - O
O
L.
L. O
L.
O
L. I OOO O
O
O Pd 320
• P434O O
O
L.
L. O
L.
O
L. O
O
O L.
L.
L. O O L.
L. O
O
O O
L. L.
O L. L. L. L. L.
L. L.
L. -

The automatic control of the coupling point 51 in terminal I is essentially the same as in terminal IL. However, since in terminal I the criteria "incoming line A or B disturbed" are not in the pilot receiver Pa and Pb alone, but by the OR Gates 315 and 316 are formed, which are each connected downstream of the pilot receiver connected to one and the same line, the control of the AND gates 312 and 313 in terminal I takes place on the one hand instead of the pilot receiver P ^ and the downstream negation 310 by the OR

Gate 315 and the Negati <connected downstream of it

320 and on the other hand instead of by the pilot) 60 catcher Pb and the subsequent negation 311 major

the OR gate 316 and the downstream

Negation 319.
The six pilot receivers in the terminal I si

with a Spe not shown in detail in the figure 65 facilities, each of which is the pilot receiver

switches off when the noise power exceeds a certain value in the channel given by bandpass filter 27 or.

with non-modulated pilot tones saves the filter for suppressing sidebands and enables a noise measurement in the pilot channel is advantageous.

The Püotempfänger belonging to one and the same group is each a bandpass filter 27 or 28 upstream, which only lets through the frequency band 300 to 360 Hz.

The pilot receiver contains in each case an LC resonant circuit with a bandwidth of 10 Hz. The pilot frequency dropping on the resonant circuit is amplified, rectified and evaluated. The Ver-

Strengthening can be done individually per line or per pilot receiver on the attenuation distortion of the to be monitored Set the line at 300 Hz.

Interference frequencies that get through the band filter 27 or 28 into the pilot receiver are avoided by the LC resonant circuit screened out, tapped at a resistor and fed to the locking device, the locks the pilot receiver and switches to the spare line if the noise level becomes too high.

If several pilot tones can occur at the same time, there are several on the pilot tones in the pilot receiver to connect tuned parallel resonant circuits in series

In addition 1 Elatt drawings

Claims (9)

Patent claims: 1. Device for remote monitoring of the operating status of message transmission devices, in particular of low-frequency transmission devices for data transmission, with pilot-monitored and switchable multiple connections at least in some of the transmission sections, in which at least one end of a transmission section has criteria for the operating status of this point and / or of the incoming transmission section and transmitted to the remote station below the frequency band provided for the message transmission, the station containing at least one pilot signal generator with a frequency below the message transmission band to be transmitted and control and / or display criteria in the remote station depending on the received pilot tones are formed, characterized in that the signals are soft pilot tones that can be switched on and off, that depending on the operating state to be distinguished, a separate frequency od it is transmitted in a manner known per se its own combination of frequencies and that an evaluation of the noise spectrum in the part of the transmission band below the message transmission band takes place with the exclusion of the pilot tones, in particular for the purpose of equivalent switching in the case of a disturbed transmission channel (A, B) by blocking the associated pilot receiver . 2. Device according to claim 1, characterized in that that in the terminal (II) determined criteria, from which in an evaluation device (31) message signals can be formed by logical combination, at least in part directly by itself to switch one of the pilot generators (15, 16, 17) on or off to serve. 3. Device according to claim 1 or 2 for remote monitoring of the operating status of a four-wire transmission device with a device for automatically switching a receiving device from a disturbed transmission channel to a further, in particular operational, transmission channel with the aid of a coupling point, each with a first pilot generator for the sending-side feeding of a pilot tone into both transmission channels and with two associated pilot receivers on the receiving side, with the help of which interference in the transmission channel switched as an operating channel and, if necessary, the operational readiness of the transmission channel switched as a backup channel can be determined and through which the coupling point can be controlled, characterized in that at least one of the terminals (II) has two further pilot generators (16, 17) which can be switched off directly by one of the pilot receivers (Pa, Pb) are included, so that the first pilot generator (15) is operated by means of a durc h both pilot receivers (Pa, Pb) controllable OR link (4) can be switched off in the event of failure of one of the transmission paths (A, B) , that in the remote station (I) two groups are provided with one pilot receiver for each pilot received, that one Group (Pb ₃₀₀ , ₃₂₀ , 340) can be connected jointly to one line (B), the other group (P ^ ₈₀₀ , 320 »sue) jointly to the other line (A) and that the outputs of the pilot receivers (P ₄₈₀₀ , _3i0 , _3i0 ; Pa _800. sm. s «) are passed to an evaluation device (31) which, as switching criteria, reports the failure of all pilot tones on one and the same incoming line, 4. Device according to claim 3, characterized in that in at least one of the groups of pilot receivers, the outputs of the pilot receivers are routed to inputs of an OR gate (316, 315) . 5. Device according to claim 3 or 4, characterized in that of the two further pairs, each with two pilot receivers of the same frequency, at least one of the pairs (P ^ ₃₂₀ , Pb ₃ Jj ₀ or Ρλ34ο> ^ S34o) the outputs to an OR -Gates (317, 314) are performed. 6. Device according to claim 5, characterized in that an AND gate (318) is connected to the OR gates (317, 314). 7. Device according to one of claims 3 to 6, characterized in that the output of the coupling point depending on the position of a multi-pole switch (26), the contacts (S2, 53, S4) together with the coupling point (Sl) can be actuated with the one or the other group of pilot receivers is connected and that the group separated from the output of the coupling point (Sl) is connected to the transmission channel (B) separated by the coupling point (Sl) from the receiving device (25). 8. Device according to one of the preceding claims, characterized in that as Message transmission band means the data transmission band 360 to 3400 Hz and as a frequency band the range 300 to 360 Hz is used for noise evaluation. 9. Device according to one of claims 1 to 8, characterized in that the pilot frequencies 300, 320 and 340 Hz.