JPS58123268A - Earth testing control system - Google Patents

Abstract

PURPOSE:To perform earth testing control in case of the occurrence of a fault and to obtain a carrier-frequency terminal signaling converter, by providing electronic parts and an electronic signaling converter by software control in common to devices, and adding an alarm control circuit. CONSTITUTION:The control part of a carrier-frequency terminal signaling converter 5 connected to the three-wire selector 3 of an exchange is provided with a loop current detecting circuit 14 and a software control circuit 13 to detect a fault of the control part. This control part sets a busy state when there is a call from the selector 3 and a fault detection signal is delayed by a prescribed time through FFs 1 and 2 when the fault of the control part is detected. Then, relays RL1-RL3 are controlled to perform earth testing through relay contacts rl1-rl3. Further, an alarm signal ALM is applied to the FF1 and FF2, which are then reset forcibly to perform control to a fault recovery free state.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field of the Invention The present invention relates to an earth testing control system in a step-by-step switching system, and in particular, as a signaling converter, it is used as a Earth testing system uses a signaling converter with a separate power supply for each control unit that controls one predetermined line of the selector, making it possible to perform earth testing control even if there is a failure when connecting a single call. Regarding control method.

(b) Background of the Technology In recent years, in the field of communications, in order to simplify the configuration of various devices, software control tubes have been introduced and electronic components have been adopted. Along with this, due to software problems and failures in one part of the various power supplies used for electronic components, it becomes impossible to maintain normal control, resulting in inferior performance compared to conventional equipment. It is required to provide the same control as conventional devices. The step-by-step replacement method is no exception, and requires a smaller device and a configuration that allows control similar to that of conventional devices.

(C1 Prior Art and Problems The conventional earth testing control method will be explained using FIGS. 1 to 3.

1- is a relay system diagram of the step-by-step exchange system. In the figure, 1 is an originating subscriber's telephone, 2 is an originating telephone exchange, 3 is a three-wire selector 4 is an originating carrier, 5
1 is a carrier end office ratio signaling converter, 6 is an outgoing multiplex conversion carrier, 7 is an incoming multiplex converter, 8 is an incoming multiplex converter, 9 is a carrier end waste input signaling converter, 10 is an incoming trunk, and 11 is an incoming telephone exchange. , 12 are terminating subscriber telephones. :'l: FIG. 2 is an explanatory diagram of the earth testing control system.

In the figure, ■ is a no-call state, ■ is when a call is captured, ■ is when a call is restored, ■ is when a downstream device is restored, and ■ is a no-call state.

FIG. 3 is a diagram showing a configuration example of a conventional carrier terminal station ratio signaling converter. In the figure, S, ,S, and S are selectors, A(1*R6*C@+BA,H
, AN8 is a relay, 1.1. is the contact point of relay person, -鵞〜b@1 is the contact point of relay B, C111+ C(+
1 is the contact of relay C・, ba to bls are relay BA
, IIFIII to ins are the contacts of relay N8, R1 to Ra are resistors, C3 to Cs are capacitors,
■. and V is a DC power supply.

FIG. 4 and FIG. 5 are diagrams showing the operation of a conventional carrier terminal station ratio signaling converter in a normal state and in a fault state, respectively.

During the connection process between the originating subscriber telephone 1 and the terminating subscriber telephone 12 in the step-by-step switching system shown in FIG.

Parter 5 receives a call from originating subscriber's telephone 1 (see Fig. 2).
) K from the 3-wire selector, and then sends the earth current for busy indication to the 3-wire selector 3 to prevent signals from other 3-wire selectors from being input. and,
When the call ends ((■) in FIG. 2), the carrier terminal station ratio signaling converter 5 momentarily interrupts the ground current to the 3@-type selector 3 for a period of t. This is to notify the 3-wire seven receiver 3 of the end of the call. In addition, after a momentary interruption of the earth's current (
2), the carrier terminal station ratio signaling converter 5 is
3! The earth current is sent to the I-type selector 3 again to prevent calls from other subscriber telephones from being input. This is to completely restore the subsequent device. Then, when the succeeding device is completely restored ((2) in FIG. 2), the carrier terminal station signaling converter 5 cuts off the sending of the ground current to the three-wire selector 3, making it non-potential (empty state). At this point, the subsequent equipment is completely restored from the momentary interruption of the earth's current (Fig. 2 ■)
The time at t is usually 400-700 ms@c. Such a control method is called an earth testing control method.

The configuration shown in FIG. 3 has been used as a carrier terminal station ratio signaling inverter for carrying out this earth test control method. That is, a single power supply (e.g. DC-4
It consisted of an electromagnetic relay using 8V).

The operation will be explained below.

When the subscriber has the telephone on-hook, there is no acquisition from the 3-wire selector 3 and no current flows on the A and B wires, so each relay is turned on, λN8°B・, C・, BA
, H do not operate, and the contacts of each relay are at the state pressure shown in FIG. Therefore, since contact BO of relay B is open, the potential on line B is at no potential.

When the subscriber's telephone is off-hook and is captured by the three-wire selector 3, a loop current flows on the A-B line, activating relay A, and contact L of relay A becomes relay B.
Switch to 0 side. This causes relay BoK current to flow,
Relay B is activated, and contacts b and 1 of relay B are switched to the relay B side, b@3 to the relay 8 side, and b, , to the ground side. By switching the contact blH of this relay B to the ground side, an earth current flows on the B wire,
Block calls from other subscribers. This earth current flows to relay H, which operates and notifies a control unit (not shown) of the connected state.

In addition, when the contact bet of relay B is closed, relay BAFi operates, and the contact point of relay BA is relay BAFi.
IIljK% blk goose relay "@IIK% bm@ respectively switches to the open side.

When the subscriber telephone is off-hook, relay A,
,B, ,H,BA maintain operation, and the contacts of their respective relays maintain the F snoring state. Moreover, on the pH level,
Earth current is sent out and the three-wire selector 3 blocks calls from other subscribers.

When the subscriber's call starts, the relay AN8 operates and the contacts ans of the relay AN8 are activated to perform billing, etc.
By switching t and mast, the polarity of the current flowing on the A line and the B line is reversed. Also, contact 1n of relay AN8
n@N is switched to the relay C0 side.

Thereafter, when the call ends, the relay AN8 is restored, and the contacts 82111 to anss of the sub AN8 are restored to the state shown in FIG. 3.

After that, when the subscriber's telephone goes on-hook, line A-B@
When the loop current stops flowing above, relay A. is restored, and the contact point of relay A. is restored to the state shown in FIG.

From this K, relay co operates, and contact C of relay C0
・Switch the sti relay to the C0 side, and switch the C/goose to the ground side.

Furthermore, by restoring contact a1 of relay A to the state shown in FIG. 3, relay B0 is restored after capacitor C1 has finished discharging, and contacts b1 to blm of relay B are restored to the state shown in FIG. 3. Condition mK recovers. By restoring the contacts S of relay B- to the state shown in FIG. 3, relay BA is restored after the discharge of capacitor C Hatake ends, and the contacts blm to bls of the eight relays return to the state shown in FIG. 3. will be restored. That is, there is no potential on the P line from the state where the contact bes of relay B changes to the state shown in FIG. 3 until the contact bag of relay BA changes to the state shown in FIG. As a result, the relay H is restored between this and the main, and the three-wire selector 3 is restored. This potential-free state on the P line is usually set to about 30 to 45 m8, and this is done by setting the discharge time of the capacitor C3.

When the contact b1m of relay-BA reaches the state shown in Figure 3, the discharge of capacitor C1 ends, and relay C
6 has been restored, and the contact point of relay C is connected to C! Until the condition reaches the state shown in FIG. 3, an earth current flows on the P line. This is to block other calls in the trench where the rear equipment is completely restored, and the tail is usually set at 400 to 700m5K.

Then, from the time when the relay co is restored and the contact C (11 and C0) of C0 is in the state shown in Fig. 2, the P line has no potential (vacant state), and the capture from the 3-wire selector 3 is disabled. possible.

In addition, in the carrier-end Okayama signaling converter shown in Figure 3, if the power supply V and relay become disabled and cannot operate, the earth current on the P line is temporarily cut off, and then other subscribers An earth current is sent on the P line to block the call. Its operation is such that when the carrier end Okayama signaling converter stops operating, an alarm signal is sent from a circuit (not shown) that detects the failure, the maintenance person closes the blockage key MB, and the earth current flows on the P line. When the fault is recovered, the maintenance person opens the blocked MBt and then performs normal operation.

However, in the above signaling converter for a carrier terminal station using a single power supply and an electromagnetic relay, the device configuration becomes large and economical cannot be achieved.

Therefore, in order to make the device smaller, lighter, and more economical, we adopted electronic components for the main signaling converter, changing from a single power source to multiple power sources, and being able to perform connection control in the same way as a continuous signaling converter. However, when one of the various power sources malfunctions or a software problem occurs, normal control cannot be maintained.

In particular, as shown in Fig. 2, as shown in Fig. 2, the status of the Astending Control System changes dramatically during restoration, so electronic signaling converters have traditionally been used as switching converters facing telephone exchanges that employ this type of system. Not possible, small size,
The present invention has no choice but to use an electromagnetic relay based on a single power supply trap, which is inferior in weight and economy.〇(d) Purpose of the Invention The present invention also provides an Okayama signaling converter that incorporates electronic components and software. The purpose is to enable earth testing control in the event of a failure.

(e) The configuration of the invention is connected within the exchange, has a first power source in the detection unit that detects call capture and recovery, and has a predetermined 11s of the three-wire selector.
A predetermined line of the 3-wire selector from the signaling converter, which has a second power source in the control unit, is set to busy state when a call is captured, and temporarily disabled when the call is restored. potential, and then closes again after a predetermined time and restores the downstream device.
In an earth testing control method that controls the controller so that it is in a no-potential state (empty state) after a few days, the cough control section of the bunaring converter is provided with a detection means for detecting a fault in the control section, and a fault from the detection means. A delay means for delaying the detection signal for a predetermined time is provided, and when one call is connected, a predetermined llj is made to have no potential, and after a predetermined time determined by the delay means, it is blocked again, and after the failure is recovered, it is made to be in a no-potential state (in an idle state). ).

(fl Embodiment of the Invention An embodiment of the earth tension control method of the present invention will be explained using FIG. 6. FIG. 6 shows an example of the configuration of the conveyance end amount ratio signaling converter used in the present invention. It is a diagram.

In the figure, the same honorifics and symbols as in Figure 3 indicate the same equipment and one power supply line, and RL to RL,
is a relay, rl.

is the contact of relay KL, ram is the contact of relay RL,
rls is the contact of relay KL, FF, 1 and FF2 flip-flops, INVI to INV3 are inverters,
C4 and CI are capacitors, ALM is an alarm signal 1: signal input terminal, 13 is a software control circuit, and 14 is a loop current detection circuit.

FIG. 7 and FIG. 8 are diagrams showing the operation of the conveyance end amount ratio signaling converter of the embodiment according to the present invention in a normal state and in a fault state, respectively.

When the subscriber telephone is on-hook, no current flows on the A and B wires due to the detection from the 3-wire selector 3, so the loop current detection circuit 14 activates the software control circuit 13. However, the contacts tl and rls of Sv-RL and RL are in the state shown in FIG. However, the RLs detects all failures and closes the three-wire selector 3, so it maintains constant operation except when a failure occurs. During this time, contact rh of relay RL connects to the earth.

Therefore, the potential on the P line is zero.

When the subscriber telephone goes off-hook and is captured by the three-wire selector 3, a loop current flows on the A line-B line, the loop current detection circuit 14 detects it, and activates the software control circuit 13.

Software control circuit 1 after startup control by software
3 sends a set signal to the S side of the flip 70-tube FFI, and the flip-flop FF1 sends out a signal of ''1 level from this point until it receives the reset signal.

This l” level signal is
It is converted to an Os level signal. As a result, relays RL and Fi operate, contact r11 of relay RL1 closes to the ground side, and earth current flows on the P line. When the ground current flows on this P line, relay RL4 operates and notifies the control unit (not shown) of the connected state. The outgoing signaling converter 5 also blocks calls from other subscribers.

When the subscriber enters the talking state, the software control circuit 13 sends a set signal to 8@ of the flip-flop FF2, and the flip-flop FF2 sends out a signal at w1+'' level from this point until receiving the reset signal. This "1'" level signal is applied to the inverter I
It is converted into a 10' level signal by NVI. This is K
Therefore, the relay RL operates, and the contact rl of the relay RL
, enables charging for closing the opposite side to the state shown in FIG. 3.

After that, when the call ends, the software control circuit 13
The RIIIK set signal for the flip-flop FF2 is sent from the 7th flip-flop FF2, the flip-flop FF2 is reset, and the output of the inverter INV2 becomes the "1" level. This causes relay KL.

is restored, and the contacts rl and Fi of relay RL and mK are restored to the state shown in FIG. 3.

Then, when the subscriber telephone is on-hook, line A-B
No loop current flows on the line, and the loop current detection circuit 14 stops activating the software control circuit 13. As a result, 13 software control circuits, free,
Send a reset signal to R@ of PUFRO and PFFI. Therefore, the output of inverter INVI is set to +1'' level, relay RL is restored, (7) contact RL is restored to the state shown in Figure 6, and there is no potential on the P line. .

When the contact rli of relay RL is restored to the state shown in FIG. 6, relay RL4 is restored and notifies the control unit of the termination of the connected state. As a result, the three-wire selector 3 is restored.

Then, by software control, approximately 30 to 45 m59
, from the software control circuit 13 to the flip-flop FF
Sends a set signal to S@ of I, operates relay RL, and contacts r1. of relay RL. Close to the ground side. This causes a ground current to flow on the P line, activating relay RL and blocking calls from other subscribers.

After approximately 400 to 700 m5 have passed (after the subsequent devices have completely recovered), the software control circuit 13 sends a reset signal to R@ of flip-flop FFI, and relay RL
, and the contact rm of the relay RLI is restored to the state shown in FIG. 3, and the P line is left in an empty state.

This allows capture from the 3-wire selector 3.

Next, a case will be described in which a failure occurs in a relay, software control circuit, etc. during a call. During a call, contacts rlt Vi of relay RL are closed to the ground side, and relay R
The contact point r7m of L is in the frost state shown in FIG.

closed on the opposite side. When a failure occurs in the carrier end Okayama signaling converter 5 and the PCM system, an alarm signal from a normally provided alarm circuit (not shown) is input to the alarm signal input terminal ALM. When this alarm signal is input to the B side of flip-flops FFI and FF2, these flip-flops Ii'F1 and FF2 are forcibly reset and output @0''
Sends a level signal. This allows the inverter I
The outputs of NVI and INV2 become "1" level, relays RL and RL are restored, and relays RL and KL,
The contacts r right and rl are in the state shown in FIG. Therefore, there is no potential on PII3i, and relay RL4Fi is activated for one day. Also, at this time, the output of inverter INV3 is I
IO" level, but relay RL does not recover immediately, and the time constant circuit consisting of capacitor C3 and resistor
Delayed recovery. At this time, contact rls of relay RLs is closed. That is, from the time the alarm signal is input, relay RL,
There is no potential on the P line until the contact r1m closes.

Then, from the point when the contact rls of relay RL closes,
Earth's current flows on the P line.

After that, when the fault is restored and the alarm signal is no longer input to the alarm signal input terminal, the output of inverter INV3 becomes 1.
1" level, and relay RL operates again. As a result, contact r6 of relay RL operates in the state shown in FIG. 3, and there is no potential on the P line, making it possible to capture the next call.

That is, the conveyance end amount ratio signaling converter incorporating electronic components and software used in the earth testing control system of the present invention is capable of performing one test/g control both in normal conditions and in the event of a failure.

Furthermore, the present invention has been applied to an outgoing signaling converter for carrier terminal equipment to enable an earth testing control system in the event of a failure; A similar problem occurs when dealing with an exchange that has a testing control method.

The present invention can also be applied to this case.

(gl) Effects of the Invention As is clear from the invention described above, according to the present invention, an electronic signaling converter controlled by electronic components and software can also be equipped with an earth testing control system by adding an alarm control circuit provided in common to the device. Since the present invention can also be used in automatic telephone exchanges having a small size and light weight, it is possible to provide an economical electronic signaling converter that can be mounted at high density.

[Brief explanation of the drawing]

Figure 1 is a relay system diagram of the step pie step exchange method.
Figure 2 is an explanatory diagram of the earth testing control system, Figure 3 is a diagram showing an example of the configuration of a conventional carrier terminal ratio signaling converter, and Figures 4 and 5 are conventional carrier terminal ratio signaling converters. FIG. 6 is a diagram showing an example of the configuration of a carrier end station ratio signaling converter used in the present invention, and FIGS. It is a figure which shows the operation|movement of conveyance - Okayama' Gunari 2 Gunpata in the case of normality and 1' fault, respectively. In the figure, 1 is the originating subscriber's telephone, 2 is the originating telephone exchange, and 3
is an AFI type selector, 4 is an originating carrier, 5 is a carrier terminal station ratio signaling converter, 6 is an output multiplex conversion carrier,
7 is an incoming carrier, 8 is an incoming multiplexing carrier, 9 is a sending end station signaling converter, 10 is an incoming trunk, 1
1 is an incoming telephone exchange, 12 is an incoming telephone subscriber, 13 is a software control circuit, 14 is a loop current detection circuit, 8m
. S,,S,is a selector,A,,B,,C,,B people. H, AN8, RL to RL4 are relays and FFI. FF2 is a flip-flop, INVI to INV3 are inverters, and ALM is an alarm signal input terminal. 'w-3 [2]

Claims (1)

[Claims] 3 from a signaling converter that is connected within the exchange and has a first power source for a detection unit 11 that detects call capture and recovery, and a second power source for a control unit that controls a predetermined line of a three-wire selector. A predetermined line of the wire selector is set to a busy state when a call is captured, temporarily set to no potential when the call is restored, blocked again after a predetermined period of time, and set to an idle state after the subsequent device is restored. In the second earth testing control method, the controller of the signaling converter includes:
A detecting means for detecting a fault in the control unit and a delaying means for reproducing the fault detection signal from the detecting means after a predetermined time are provided,
One! When there is a failure in the control unit during continuous calls, #33
1. An earth test control method, characterized in that one predetermined wire of a wire collector is made to have no potential, is closed again after a predetermined time determined by the delay means, and is controlled to be in an empty state after recovery from a fault.