JPS60192451A - Fault supervisory circuit - Google Patents

Abstract

PURPOSE:To detect earthing, positive abnormal voltage and negative abnormal voltage and also crosstalk between lines by providing a supervisory circuit capable of alarming having a power supply of the same level as each class identification power supply corresponding to each class identification power supply, detecting a voltage when a voltage different from the voltage of each power supply is inputted including earthing. CONSTITUTION:A +13V or -13V low battery voltage is applied to polar relays LPB, LNB via a rectifier circuit comprising a bridge consisting of diodes D respectively, a +50V or -48V high battery voltage is fed respectively to polar relays HPB and HNB via a resistor R. An alarm lamp LPBAL indicates a faulty state of a line (LPB) that a voltage other than +13V, that is in excess of +13V or not reaching +13V or earthing exists positively. Further, an alarm lamp HPBAL indicates a fault of a line (HPB) that a voltage other than +50V, that is a positive or negative voltage not reaching +50V exists.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Technical Field of the Invention The present invention relates to a fault monitoring circuit for detecting a fault in a power supply lead for incoming trunk class identification in a crossbar type toll exchange.

Prior Art and Problems In a crossbar type toll exchange, the connection to the previous station is made through the trunk of the incoming line, that is, the incoming trunk.
At this time, for each incoming trunk, a class is predetermined for each incoming trunk, such as outgoing band, billing information, caller class (general/machine, etc.), priority class, etc., and the common control device of the exchange is The connection operation is performed according to the class. Therefore, in a crossbar type toll exchange, the class of a large trunk is essential information for switching operations, and it is extremely important to be able to correctly identify this.

FIG. 1 shows a schematic configuration of a crossbar type toll exchange relay system. In the same figure, rcsw is the on switch, oc
sw is the output switch, ICT is the input (2) rank, OWT is the outgoing trunk, OCT is the outgoing trunk, IWT is the incoming trunk, ROT is the reorder trunk, C0NN is the switch frame connector, R5L is the register sender link, R3 is the Register sender, DC is decoder connector, MKR is marker, MC is marker connector, DCR is decoder, TC is translator connector,
TLR is the translator, MFRECC is the MF receiver connector, MFREC is the MF receiver, TBC is the trunk block connector, KPDF is the billing pulse distribution device, MT
F is a centralized test rack.

In FIG. 1, the large trunk ICT, ζ, connects with the preceding station, and its class is predetermined. The incoming trunk TCTO class identification is performed by the decoder DCR on the trunk rack TRKFCE (not shown) which is equipped with a large trunk ICT group. I CT, register sender link R3L, register sender R3, decoder connector (3
) This is done by reading through the decoder DC and decoder DCR.

FIG. 2 extracts only the portion related to human trunk class identification in the relay system shown in FIG. 1 and shows it in slightly more detail. In the figure, No. OD CR indicates one decoder among several decoders.

When performing class identification of the incoming trunk from 111O, OD CR, the class hatch restart relay CBS (not shown) is in operation, and four types of power supplies -48V, -13V, +50V, → -1
, 3V. These power sources are battery 48V,
+50V and voltage-dividing resistors R and R, and in the trunk rack T R' K F CE, terminals LPB, HPB, LNB via the contact eta of the emergency transfer sleeve assistance relay ETA.

It is sent to the input l~rank ICT via a jumper between the HNB and the terminals A and B in the input l~rank TCT, and is connected to the contact co, the register sender link R3l7. It returns to the decoder It and ODCR again via the contact tc of the register sender R3 and the contact dec of the decoder connector DC (4).

In decoder No. OD CR, this is connected to contact c.
The signal is received by a class receiving relay consisting of a diode D, a Zener diode ZD, and relays CL A to CL F via the BBS, and the class is identified.

Zener diode Z in Imari CLA-CLC
The rated voltage of D is set to 18V, so when -48V is input, relays CLA and CLB operate, and when -13V is input, only relay CLA operates. When +13V is input, only relay CLC operates, and when +50V is input, relays CLB and CLC operate.
operate, so the input voltage can be identified by a combination of the operating states of these relays. Similarly, in the relay CLD-CLF, the rated voltage of the Zener diode ZD is set to 18V, so that the relays CLD, CLE, C1, . . . D.
Since CLF, CLE and CLF operate, the input voltage can be identified by the combination of the operating states of these relays (5).

In this way, the terminal LP of the trunk rack TRKFCE
By connecting two jumpers between B-HN B and terminals A and B of the incoming trunk ICT, 16 types of states can be identified using four types of power supplies. By appropriately wiring and predetermining the connections to the terminals LPB-HNB of the trunk rack TRKFCE, 1.0 to 11.
The class of incoming trunk ICT can be identified from the DCR.

Actually, in the exchange, a plurality of decoders DCR are provided as described above, and all four types of power supply sides are connected in multiple ways. A plurality of trunk racks TRKFCE are also provided, and these are also connected in multiple ways. In this case, between the decoder group and the trunk group, the connection lines are concentrated into one each, forming a bus bar. In Figure 2, 1. 2. 3. Reference numeral 4 indicates a connection line that has been converted into a busbar in this manner.

There is also a method of distributing the class identification power supply to each trunk rack TRKtC (6) or consolidating it in one place.
From the point of view of economy and risk distribution, each decoder DCR is provided with a power source for class identification, as shown in FIG. Therefore, if a fault such as ground voltage or abnormal voltage occurs on this bus, it may become impossible to identify the class of the human trunk ICT in all decoders DCH, resulting in a system failure. Furthermore, failure of the lead wires after the busbar also has a considerable effect on the replacement operation.

Therefore, all decoders DCH are provided with an incoming trunk class identification power supply output lead monitoring circuit (hereinafter simply referred to as a monitoring circuit) 5 in common, so that when all decoders are not performing class identification, that is, the contact cbs is inoperable. In the state, bus bars 1 to 4 are respectively line (LPB) ~
(HNB) is connected to the monitoring circuit 5 to monitor earth air and abnormal voltage. In addition, all trunk racks TR
A standby power supply section 6 having the same configuration as the power supply section in the decoder DCR is provided in common with the KFCE (7), and when the bus fault occurs, the emergency transfer relay ET is operated by flipping the telephone key E, and the contact point is activated. At the same time, the emergency transfer auxiliary relay ETA is operated, and the emergency transfer auxiliary relay ETA is operated.
The terminal LPBWHNB is connected to the standby power supply unit 6 through the contact eta.
I am trying to connect to. These common monitoring circuit 5 and standby power supply section 6 are provided in the centralized test rack MTF.

FIG. 3 shows the configuration of a conventionally used monitoring circuit. In the figure, a class hatch restart auxiliary relay CBSA (not shown) operates when the class battery start relay CBS is inactive and closes its contact cbsa. As a result, lines (LPB) to (HPB) are connected to alarm relay AL via diode D. Relay AL is connected to the -48V power supply, so when earth or positive voltage is generated on line (Ll)B) to (HN B ), relay AL operates and self-holds,
The alarm lamp AL is turned on and a major alarm signal MJ is sent. Alarm reset (8) If you knock down the electric key AR, the alarm state will be canceled.

In this way, in conventional monitoring circuits, four lines are integrated into one alarm relay via diodes, and therefore it is possible to monitor ground voltage and positive abnormal voltage, but negative abnormal voltage and inter-lead crosstalk can be monitored. It was not possible to detect or monitor which leads had failed.

OBJECTS OF THE INVENTION The present invention attempts to solve the problems of the prior art, and its purpose is to provide a monitoring circuit for monitoring failures in the class identification power supply lead of a large trunk in a crossbar type toll exchange. It is an object of the present invention to provide a monitoring circuit capable of detecting negative abnormal voltage in addition to ground voltage and positive abnormal voltage, and also capable of detecting inter-lead crosstalk.

Examples of the invention FIG. 4 shows the configuration of an embodiment of the present invention.

In the same figure, LPB-HNB are each line (LP
B) - Polarized relays provided corresponding to (HNB), L
PBA-HNBA are each polarized (9) auxiliary relays provided corresponding to LPB-HN B, LPBAL-HNBAL are auxiliary relays LP, respectively.
B Alarm lamp lit by A~HNBA, VR
is a variable resistor for adjusting the sensitivity of each polarized relay.

In Fig. 4, the polarized relays LPB and LNB are supplied with low battery voltages of +13V and -13V, respectively, through a rectifier circuit consisting of a bridge constituted by a diode D, and the polarized relays HPB and HNB are supplied with a resistor R. High battery voltages of +50V and -48V are provided through the power supply terminals, respectively. When the contact cbsa is closed by the operation of the class battery start auxiliary relay CBSA (not shown), for example, if a voltage other than +13V exists on the line (L P B), current flows through the bridge rectifier circuit consisting of the diode D, and the polarized relay LPB operates, which causes auxiliary relay L to be activated via meter contact 1pb.
PBA works. Due to the operation of the auxiliary relay LPBA, the auxiliary relay LPBA maintains itself through the contact +pba, and the alarm lamp LPBAL lights up through the other contact (10) Ipba.

This causes the line (LPB) to be in a voltage state other than -13V, i.e. if it exceeds +1'3V or +13V.
Warning lamp L indicates an abnormal condition in which a positive voltage that does not reach V
This is displayed by lighting P B A L. Similarly, when a voltage condition other than +50V exists on the line (HPB), current flows through resistor R and operates polarized relay HPB, which in turn causes auxiliary relay H to operate via meter contact hpb.
When PBA operates, the auxiliary relay HPBA is self-maintained via its contact hpba, and the alarm lamp HPBAL is lit via another contact hpba. As a result, an abnormal state in which there is a voltage other than +50V on the line (HPB), that is, a positive voltage that does not reach +5'OV, and a negative voltage, the warning lamp HP B will be activated.
Indicated by lighting of AL. Further line (LN
B) When a negative voltage condition other than -13V exists on polarized relay 1. , N B , the alarm lamp L N B A L lights up due to the operation of the auxiliary relay L NBA, and -1
Indicates a voltage condition other than 3V, that is, a negative voltage that does not reach -3V or exceeds -13V, and an abnormal condition in which a positive voltage exists, and -48■ is displayed on the line (HN B ).
When voltage conditions other than polarity exist, −+−+N
B. The alarm lamp HN B A L lights up due to the operation of the auxiliary relay H B A, indicating a voltage state other than -18 V, that is, an abnormal state in which there is a negative voltage that does not reach -48 V, and a positive voltage. do. The alarm state in each auxiliary relay is canceled by knocking down the alarm reset electric key AR.

In this way, the circuit of FIG.
, 2.3.4 and subsequent leads can be monitored. At this time, external voltages of the same voltage as the voltage that should be sent to these gates during class identification are not detected because they do not affect the exchange operation, but other voltage conditions are ground voltage as described above. It is possible to detect everything including. Inter-lead crosstalk can also be detected because the voltages applied to each relay are different. At this time, relay LPB detects voltages other than +13V, which is the intermediate potential, and relay LN detects voltages other than -13V.
B is equipped with a rectifier in which a diode 'D is connected to a bridge, so that current in the same direction flows through the polarized relays in response to voltages in both positive and negative directions, so that the same operating state is achieved in the polarized relays with current polarity. I'm trying to get it.

In the fault monitoring circuit of the present invention, the monitoring relay L
Since polarized relays are used for P B to HN B, the sensitivity is extremely high, and therefore the detection range can be widened as described above. A variable resistor ■R is inserted in series with the secondary winding of each polarized relay, and by adjusting it, the current value flowing through the secondary winding can be adjusted as desired.
Therefore, the sensitivity of each polarized relay can be adjusted to a desired value.

With the circuit of the present invention, it is now possible to detect ranges that could not be detected with conventional monitoring circuits, and in some cases, it has become possible to reliably detect failures that may lead to the suspension of replacement operations. Further, the secondary windings of each of the auxiliary relays LPBA to HNBA are short-circuited, thereby giving each auxiliary relay a slow action characteristic (13). Polarized relays have extremely high sensitivity, so there is a risk that they may be activated by minute noises that enter the line, but each auxiliary relay has slow-acting characteristics, so it is difficult to operate the polarized relays for such short periods of time. Therefore, stable alarm operation can be performed.

The fault monitoring circuit shown in Fig. 4 is designed to detect faults after the bus line 1.2° 3.4 in Fig. 2 by providing a circuit that disconnects each trunk rack from the bus bar one by one. , it is also possible to use it to search for faulty racks on a rack-by-rack basis.

Effects of the Invention - As explained above, according to the fault monitoring circuit of the present invention,
A monitoring circuit that has a power source of the same power as each class identification power source corresponding to each class identification power source, and detects this and issues an alarm when there is a different voltage input from each power source including earth air. When all decoders in the replacement unit are not performing large trunk class identification operations, connect the voltage of each monitoring circuit to the decoder output section of the same circuit (1+) to the class identification power lead busbar. By doing so, it is possible to detect an abnormal voltage in each class identification power supply lead, that is, a voltage state different from that of the identification power supply including ground air, and crosstalk between each lead and other leads.

[Brief explanation of drawings]

Figure 1 is a diagram showing a schematic configuration of a crossbar type toll switch relay system, Figure 2 is a diagram showing details of the part related to incoming trunk class identification in the configuration of Figure 1, and Figure 3 is a diagram of a conventional fault monitoring circuit. FIG. 4 is a diagram showing the structure of an embodiment of the fault monitoring circuit of the present invention, but does not show the structure. LPB, HPB, LNB, HNB-polarized relay, LPB
A, HPBA, LNBA, HNBA-1 auxiliary relay, L
P13AL, HPBAL, LNBAL. 1-I N B A L---Alarm lamp, AR-alarm reset key, VR-variable resistor, R-resistance Patent applicant Fujitsu Co., Ltd. (Masuda/i7) Agent Patent attorney Gobe Tamamushi ( 1 other person) (15)

Claims (1)

[Claims] In order to detect the I rank class of the incoming line, multiple class identification power supplies are sent from the decoder of the common control device through the trunk rack, incoming trunk, register sender link, register sender, decoder connector, and decoder, and are received. In the automatic replacement method that performs a replacement operation based on the result, the power source corresponding to each class identification power source has the same level as the class identification power source, and has a different voltage input from each power source including ground air. A monitoring circuit is provided which detects this and issues an alarm when this occurs, and when all the decoders in the replacement unit are not performing the incoming trunk class identification operation, each of the monitoring circuits is connected to the same power source as the monitoring circuit power supply at the decoder output section. A fault monitoring circuit characterized in that it is connected to a power lead busbar for level class identification.