JPS6033035B2 - Trunk control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control system for trunk circuits in telephone switching systems, data transmission systems, and the like.

FIG. 1 shows, as an example for explaining the prior art, a trunk circuit for an in-office public telephone used in an electronic exchange. In the figure, F is a filter for absorbing the noise of the fraud signal, and RO is a resistor for discharging the charge of the capacitor in the filter F.

A and D are relays for monitoring calling and terminating subscribers, respectively, and RI is a resistor for holding relay A so that it does not recover when sending out a security code. C0 and CI are DC cut capacitors, and the E river also supplies communication current.
is the power source for operating relays A and D.

P and Q are relays for transmitting the transfer signal, and are driven and controlled by flip-flops FF0 and FFI in the signal distribution device SD.

EI is a power source for driving relays P and Q.

S is a pattern magnetic latch type relay for controlling the pattern of the trunk circuit TRK, and is driven by a relay drive device RD. DO and DI are drivers for operating and restoring the relay S, respectively, and t is a contact point for distinguishing between operation and restoration.

E2 and E3 are power supplies for operating and restoring the relay S, respectively. a and d are contacts for informing the central control unit of the status at the contacts of relays A and D respectively, ie the status of the calling and terminating subscriber.

According to the known electronic exchange, when the main trunk is captured as a result of the numerical analysis of the dial pulse and the called subscriber answers, the A relay side of the main trunk transfers to the calling subscriber, and the D relay side of the main trunk transfers to the called subscriber. connected via a network.

Thereafter, the pattern relay S is driven via the relay drive device RD, and communication current is supplied to both subscribers through the A and D relays to start a conversation. Thereafter, the signal distribution device SD sends relays P,
By driving Q, a fraud signal is sent out.

When the caller goes on-hook at the end of the call, the main trunk's A
The relay is restored, and the information is transmitted to the central control unit via contact a, stopping the sending of the fraud signal, and the S relay is restored via relay drive device RD.

As mentioned above, according to the subordinate trunk control method,
The central control device must edit relay designation information to determine which relays in the trunk are to be driven and controlled, which increases the burden on the central control device and reduces the I/O from the central control device.
In order to receive the J-ray designation information, designate it, and drive the J-ray, a signal distribution device and a ray driving device are required, resulting in an increase in the amount of hardware required. SUMMARY OF THE INVENTION The present invention aims to solve the above-mentioned conventional drawbacks, and each trunk circuit is provided with a memory capable of storing a series of call processing operations, each call processing pattern is set in the memory, and a central processing By simply sending timing signals such as set, reset signals, or clock signals from the device to the memory, various pattern controls can be performed, eliminating the need for relay drive devices and signal distribution devices, and even changing the type of trunk circuit. It enables the integration of

Embodiments of the present invention will be described below with reference to FIGS. 2 to 4.

Fig. 2 shows one embodiment of the trunk circuit of the present invention, Fig. 3 is a drive time chart of each pattern relay in the trunk circuit of Fig. 2, and Fig. 4 shows the realization of the time chart of Fig. 3. This shows the contents of memory for In FIG. 2, parts with the same symbols as in FIG. 1 indicate the same parts. ROM is a commonly used memory with an 8-word address and 4-bit data area, AR is the memory address register and timing circuit, and D
R is a data register. ○2 to D4 are drivers for driving pattern relays S, P, and Q. Figure 3 shows the contents of the memory ROM in Figure 2. It is a memory with a capacity of eight 8 words x 4 bits, 0 to 7 each consisting of 4 bits, and the address is as shown in the time chart in Figure 4. Information for controlling the drive of the indicated pattern relays P, S, and Q is stored.

That is, when an address register is specified, the word (4 bits) of the address corresponding to the data register DR is read out. 0 bit of data register DR is S relay,
Since 1 bit corresponds to a P relay, 2 bits corresponds to a Q relay, and 3 bits corresponds to an empty state, pattern relays S, P, and Q are operated or restored according to the read word. The call processing operation of the trunk circuit according to the method of the present invention will be described below with reference to FIGS. 2, 3, and 4.

Note that the timings T and -L in FIG. 4 are created by the central controller. First, as a result of dial pulse digit analysis, this trunk is connected to the calling and terminating subscriber via the network, and when the terminating subscriber answers, a set pulse and clock are received from the central controller, and the address register AR shown in Figure 2 When address 1 of the memory ROM is specified, "1, 0, 0, 0" is read into the data register DR from the contents of the memory ROM shown in FIG. 4, and the corresponding S relay operates.

Next, when the clock pulse reaches timing T, the address is counted up and the address register AR is set to 2.
Specify the address and enter the data register from the contents of the ROM.
``1,0,1,0'' is read from the 0th bit, and the corresponding S relay and Q relay drivers D2 and D3 are driven, and the S relay continues its operating state and a new Q
Relay works. Next, when the clock comes at timing T2, the address is counted up in the same way, address 3 is specified, and the data register is "1, 1, 1, 0".
, and the S relay, Q relay, and P relay are driven. In the same way, the clock is output from the central control unit at the timing of T3 to T8, and the address counts up, and the addresses of M, the state side, and the Nagisa army are successfully removed, and the address corresponds to the address. The driver of the bit corresponding to the output is driven by the output, and the relay corresponding to the driver is driven according to the time chart shown in FIG.

In addition, after K, T5, T6, T7, public, T5...
The timing of ... is repeated, and the corresponding address 6
Address, address 7, address 6, and address 5 are specified.

For calls within your own office, the public call time is 3 minutes. When the caller goes on-hook at the end of the call, relay A is restored in Figure 2, and its contact a transmits the information to the central controller, which sends a reset pulse to the memory RO.
Address 0 is designated as the address of M, and the SIJ relay is restored to the initial state.

As explained above, according to the present invention, there is no need for a driver drive device, a signal distribution device, etc., and furthermore, trunk circuits with similar call processing only need to change the contents of the memory, and it is possible to integrate the types of trunk circuits. will also contribute.

In this embodiment, a public trunk circuit within the local office has been described, but other trunk circuits or transmission system unit circuits can be used as well.

[Brief explanation of the drawing]

Figure 1 is a circuit diagram showing an example of a conventional trunk circuit; Figure 2 is a circuit diagram showing an example of a conventional trunk circuit;
3 is a circuit diagram showing an embodiment of the trunk circuit of the present invention, FIG. 3 is a diagram showing the contents of the memory, and FIG. 4 is a time chart showing the operation of the embodiment. TRK...Trunk circuit, S, P, Q...Pattern relay,
ROM...Memory, D2-D4...Driver, T, ~T
8...Timing signal. Sai'zuzai3zuzai2zujako4zu

Claims (1)

[Claims] 1 In a trunk control method in which pattern relays in a trunk circuit are controlled from a central control device, a memory in which sequences for operating and restoring multiple pattern relays are written in the trunk circuit, and a drive controlled by the output information of the memory A trunk control method characterized in that a circuit is provided, and the pattern is changed by a timing signal from a central control device.