JPS59123354A - System for detecting and processing abnormal congestion - Google Patents

Abstract

PURPOSE:To make the scale of a power supply suitable by locking out immediately a new call when an abnormal congestion of a traffic of an exchange occurs. CONSTITUTION:Telephone sets TEL1-TELn are connected to a time-division communication network device TDNW via subscriber circuits LC1-LCn. An output of a power supply PS is applied to a controller CTL and the circuits LC1- LCn via an overcurrent control section I-CTL and a DC-DC converter DC. A control section I-CTL supervises a load current Ia and when the current attains a prescribed value, it is discriminated as an abnormal congestion, a signal is transmitted to the circuit CTL, which locks out a new call.

Description

[Detailed Description of the Invention] Technical Field of the Invention The present invention relates to an abnormal congestion detection processing method, and more specifically, when the current consumption of an exchange exceeds a certain standard value, it is determined that there is abnormal congestion in the call volume, and a new This invention relates to a processing method for detecting an abnormal width of call volume in a time-division exchange in which the outgoing dialing tone is changed out.

PRIOR ART AND PROBLEMS According to the conventional art, the electrolyte device of a switchboard is generally installed with the assumption that the switchboard will have sufficient capacity from the beginning even during abnormal congestion. Therefore, generally a large-capacity power supply device is used, which makes the power supply part expensive and uneconomical.

In addition, in conventional technology, when the call volume of an exchange becomes abnormally busy, it is common for the control unit of the exchange to detect and display this, and based on this display, the maintenance group artificially assigns calls to callers. The problem was dealt with by switching etc. In this way, human intervention is required to handle the large volume of air swabs, so
It was difficult to respond quickly and could not be called rational.

Purpose of the Invention The present invention prevents the above-mentioned diseconomies of the power supply section and the above-mentioned unreasonableness in dealing with abnormal fluctuations in the call volume of the exchange due to the conventional technology, by automatically locking out new calls, and by sizing the power supply to a reasonably small size to accommodate normal call volumes, which are much lower than during abnormal periods. The purpose is to make power supply devices more compact and economical.

Example of practical application of invention Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing an overview of an embodiment of the present invention.

In the figure, TEL1 to TELn are telephone numbers, LC1 to L
Cn is the subscriber circuit, and TDNW is the subscriber circuit LC1~
A time-division communication network device that collects communication lines from LCn, C
-TL is a control device, PS is a -48V DC power supply, I-CTL is an overcurrent control unit, DC is a DC-DC converter, and -48V is sent from the power supply PS.
It converts V current into +5V DC. The figure clarifies the outline of the power supply system for the subscriber circuits of a time-division exchange.The thick lines in the figure are the lines through which direct current flows for the electrolyte, and the wholesale lines are the lines through which call signals and control signals pass. shows.

The subscriber circuits LC1 to LCn include a telephone cut-off circuit, a relay, etc. that operate in conjunction with the -43V DC supply hall, and also have +
It has a logic circuit including an A/D converter, a D/A converter, and a control circuit that operate on 5V DC.

If the telephones TEL1 to TELn are all on-hook, the load current Ia supplied from the power supply PS is the current constantly consumed by the DC-DC converter DC (necessary to supply current to the control circuit CTL). (including consumption) only need to be supplied. Let the current value at this time be the total Ias.

However, when a certain telephone goes off-hook, its subscriber circuit requires 148V DC current, and the +5 DC current received from the underground DC-DC converter DC is transferred to the 48V DC power supply PS. If the current value converted to the output current is Ibo, the magnitude Ia1 of the load current Ia when one telephone goes off-hook is Ia1=Ias+(Iao+Ibo).

The magnitude of load current Ia when all telephone equipment TEL1-TELn are off-hook at the same time is Ian=
Ias+n(Iao+Ibo).

Generally speaking, in a switchboard, it is impossible for all the installed telephones to go off-hook at the same time, so a certain monthly amount (which can be seen as the number of old-school telephones that are making calls at the same time) is rejected, and this setting is made. If the traffic exceeds the traffic volume, it is queued as abnormal congestion, but since such abnormal congestion occurs frequently, the capacity of the local power supply equipment has traditionally been quite large in order to sufficiently cover cases of such abnormal congestion. Since it was widely fixed, t power supply (FS) and DC-DC converter (DC)
became larger and more expensive. According to the present invention, an overcurrent suppressing section I-CTL is provided at the output section of the -48V source device. −
48 The load current (Ia) supplied from the power supply PS passes through the overcurrent control unit I-CTL, and at this time, the magnitude of the load current Ia is monitored and the load current Ia is tree,
For example, when the number of calls is p among
current Ia when off-hook (p<n)
When it is detected that p [=Ias+p(Ia1+Ib1)] has been reached, it is determined that it is an abnormal vehicle comparison, and control is sent to the control circuit CTL, which further controls the subscriber circuit LC1-.
Sends a control signal to LCn to turn off a new call.

Still, for example, if some of the p telephones that are currently being followed at the same time ends the call and goes on-hook, and the number of telephones that are currently on the line is reduced to q (however, q<p), then the above Release the lock upon activation. In this way, if abnormal call volume congestion is encountered, appropriate processing is immediately carried out, and the load on the switch is reduced.Therefore, the power supply is not overloaded, and normal calls are handled. It can be appropriately scaled to handle only large quantities.

FIG. 2 is a diagram showing a more detailed configuration of the subscriber circuit and overcurrent control unit I-CTL of the embodiment of the present invention shown in FIG.

In the figure, TEL is a telephone, LC is a subscriber circuit, which is an example of one of the many provided in a time division exchange, DC is a DC-DC converter that outputs +5V DC as a total input of -48V DC, I-CTL is an excessive current control circuit, PS is a -48V DC power supply device, and T-DNW is a time division telephone network device.

In the subscriber circuit LC, BS is a power supply path to the telephone TEL, a relay for RL, and -48 from the power supply PS.
V, and when calling the telephone TEL, it also receives -48V from the power supply PS and uses a calling current (16Hz
alternating current). RTP is a ring trip circuit, L
OG is a logic circuit that connects the A/D converter, the D/A converter, and the control circuit L-CTL, and includes the ring trip circuit RTP and logic! The circuit LOG is connected to +5V DC from the DC core inverter DC.

When the switching relay is not congested and is in a normal state, the switching relay HT of the overcurrent control unit I-CTT is in a non-operating state, and its contact ht0 is in the position shown in the figure.

In this state, by fully operating the signal sending relay RL of the subscriber circuit LC and replacing its contacts rl0 and rl1, a ringing signal can be sent to the telephone TEL.

That is, by operating the signal sending relay RL, the γ point r
l0. When rl1 is switched, the ringing signal generated by the ringing information generating upper RG is transmitted from the ringing signal generator RG to the stationary contact ht0, the resistor r1 of the subscriber circuit LC, and the switched contact rl1. , line, telephone device TEL, circuit, switching contact rl0, resistor r
2, it flows to the 148V trap source device PS, and the telephone T-EL
Because of the flow, the bell will ring all the time.

If the inputter responds by taking the telephone device TEL off-hook, a DC loop is established through the telephone device TEL,
Direct current flows through the resistor r1 by the -48V power supply PS. The DC voltage across the resistor r1 is detected by the song trip circuit RTP, and the control circuit L-C in the logic circuit LOG is detected.
TL is notified, and the ringing signal is stopped by restoring the serial relay RL under the control of the control circuit L-CTL.

If the telephone equipment TEL is connected, the analog communication signal sent from the telephone equipment TEL reaches the hybrid H via the telephone line and stationary contacts rl0 and rl1, where it is connected to the 2-wire 4-wire The signal is then converted into a digital speech signal by the A/D converter A/D, and is input to the time division speech abbreviation device TDNW. On the other hand, time division communication path device TDN
The digital call signal output from the W is converted into an analog call signal by the D/A converter D/A, and then passed through the hybrid H to be converted into a Denkatsu ITFL.

Suppose, when r out of all n subscribers of this split switch become busy, there will be an abnormal congestion of 7, and the number of active telephones will change from p to q (q<p). It is assumed that a criterion is set to indicate that the call length is normal when it starts to decrease.

-Load current Ia supplied from 48V DC power supply PS
flows to the load (DC-DC converter DC, each subscriber circuit, etc.) via the resistor r8 of the excess current control unit I-CTL,
The terminal voltage of resistor r8 changes due to the load current Ia.

When field congestion occurs, the load current Ia becomes Iap, but its magnitude can be determined by comparing the terminal voltage of resistor r8 with the reference voltage VR0 set in the cut-off detection section D, and it is determined whether the current is normal or not. The magnitude Iaq of the load current Ia when it returns to is also detected by comparing it with a reference voltage VR1 different from the above.

When the current detection unit D detects that the current Ia supplied to the load from the -48V DC power supply PS has reached Iap, the current detection unit D switches on the switching relay HT.
make it work.

Then, the contact ht1 is opened and a notification is sent to the control device CTL of the exchange (see Fig. 1), and the control device CTL sends a control signal to the control circuit L-CTL of the subscriber circuit LC.
When the control circuit L-CTL detects a new call from the subscriber's telephone equipment TEL, it immediately sets the signal sending relay RL to operate.

On the other hand, due to the operation of the switching relay HT, its contact ht0
can also be switched.

If the subscriber takes the telephone TFL off-hook, this activates the signaling relay RL of the subscriber telephone TEL in accordance with the above. Then, a busy signal is transmitted from the busy signal generator BT of the overcurrent control unit I-CTL to the capacitor C, the switched contact ht0, the resistor r1, the switched contact rl1, the line, the telephone TEL, the line, and the switched contact. The voltage flows through contact rl0 and resistor r2 to the -48V power supply. Since a busy signal (alternating current) is transmitted to the telephone device TEL as described above, a busy tone is emitted, causing the subscriber to abandon the call. Even if a busy signal flows through resistor r1 as described above,
The DC current from the -48V power supply is blocked by the combiner C, and since no self-pressure drop occurs in the resistor r1 due to the DC current, the ring trip circuit RTP is a furnace action and does not restore the signal sending relay RL. Therefore, the contacts rl0, r
l1 is switched stably and the busy signal is reliably connected to the telephone equipment T.
Sent to EL.

Note that when this time-division exchange is experiencing abnormal congestion, no new call connections are made, and therefore there is no need to send a ringing signal, so the signal sending relay RL allows the busy signal to be sent to the telephone without any hindrance such as sound. It can be sent to At the time of abnormal congestion, the relay RL may be operated in advance regardless of whether or not the subscriber makes a call.

FIG. 3 is a diagram showing a detailed configuration of an example of the current detection section D of the overcurrent control section I-CTL shown in FIG. In the figure,
PS is -48V DC power supply, I-CTL is overcurrent control unit, and LOAD is DC-DC converter D shown in Figure 2.
C1 load including each subscriber circuit, etc., and Ia is -48
V shows the load current supplied from the DC power supply device PS to the load.

The voltage Va between the terminals of the resistor r8 is amplified by the amplifier AMP and inputted to one input terminal (-) of the differential amplifier D-AMP. -4 at the other input terminal (+) of the differential amplifier D-AMP
8V and earth resistance r4. The base voltage VR0 obtained by dividing the voltage by r5 is manually generated. Here, the load current Ia is Ia
When the magnitude of p increases (when the exchange changes from normal to abnormal congestion), a total voltage equal to the voltage output from the amplifier AMP and input to the input terminal (-) of the differential amplifier D-AMP is generated. It is set in advance as a reference voltage VR0. Therefore, when the load current Ia exceeds the above Iap, the differential amplifier D-AMP produces an output, which causes the transistor TR
is turned on to operate the switching relay HT. As described above, a new call is clocked out by the operation of this switching relay HT.

At this time, the output of the differential amplifier D-AMP is fed back to its input terminal (+) via the resistor r7, and the base voltage VR0
The lower second voltage VR1 is applied to the differential amplifier D-AMP.
It will be set to the input terminal (+) of

On the other hand, at the exchange, new calls are made and telephones that are making calls go on-hook when the call ends, so the number of telephones gradually decreases. When the telephone q- is in use, the load current Ia becomes Iaq. At this time, the output from the amplifier AMP is output to the input terminal of the differential amplifier D-AMP (
-1) is set so that the voltage inputted to the second reference voltage VR1 is the second reference voltage VR1.

Therefore, when the number of telephones talking at the same time reaches q, the output of the differential amplifier D-AMP disappears, the transistor TR is turned off, and the switching relay HT is restored.

By closing the contact ht1, the control device CTL is notified of the release of a new call, and as a result, the control device CT
L sends a control signal to the control circuit L-CTL of each subscriber circuit LC to return it to the normal state.In other words, when the power supply circuit BS detects the output from the input signal, the control circuit L-CTL of each subscriber circuit LC -C
When the TL is notified, call processing is performed without operating the relay RL.

The present invention is not limited to the above-mentioned embodiments, and various modifications can be made within the technical scope thereof.

Effects of the Invention Since the present invention is configured as described above, it is possible to automatically lock out new calls in a time division exchange as soon as an abnormality in the call volume of the exchange is encountered. It is possible to make the power supply equipment of an appropriate size to handle normal calls, achieve economicalization of the power supply equipment, and automatically deal with abnormal call volume quickly and rationally. There are benefits to be gained.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the outline of the configuration of an embodiment of the present invention, FIG. 2 is a diagram without showing the detailed configuration of the embodiment of the present invention, and FIG.
FIG. 3 is a diagram showing a detailed configuration of an example of a current detection section of the illustrated embodiment. TEL, TFL1~TELn...telephone, LC, LC
1 to LCn...subscriber circuit, CTL...control device,
PS...-48V DC power supply, I-CTL...Overcurrent control unit, DC...DC-DC converter, TDN
W...Time division communication path network device, H...Hybrid,
LOG...logic circuit, A/D...A/D conversion device,
D/A...D/A converter, L-CTL...control circuit, BS...power supply circuit, RTP...ring trip circuit, RL, HT...relay, D...current Detection unit, C... Capacitor, BT... Busy sound generator, R
G...ringing signal generator, AMP...amplifier, D-AMP...differential amplifier, TR...transistor. Patent Issuer: Fujitsu Ltd. Representative Patent Attorney Gobe Tamamushi (3 others)

Claims (1)

[Claims] At several time-division exchanges, the current flowing into the exchange from the power supply device that supplies power to the exchange is monitored, and when it is detected that the current exceeds a preset value, it is determined that the call is at an abnormal width. The control device is equipped with an overcurrent control unit that notifies the control device of the exchange of abnormal congestion, and when the control device sends the above-mentioned notification of abnormal congestion, it controls all subscriber circuits to restart a new one. Call-
An abnormal congestion detection processing method characterized by locking out.