JPS60241395A - Trunk circuit - Google Patents

Abstract

PURPOSE:To simplify hardware and to accomplish complicated actions by providing a microcomputer having an interface function with a DC signal part. CONSTITUTION:When there is activation from a circuit, a DC signal part 401 detects this activation, and inputs it to a microprocessor 402, which detects this activation, and transmitted it to an SS line through a level converter circuit 403. An activation signal is transmitted to a PCM-MUX and detected by a processor of an exchange. As a result, when the signal is returned to an SR line of a trunk for recognizing the activation, the level conversion is executed in the circuit 403 and inputted to the processor 402, which drives the signal part 401 through a lead wire 404, and transmitted an activation recogniging signal to an intermediate line.

Description

TECHNICAL FIELD The present invention relates to trunk circuits, and more particularly to trunk circuits that interface communication lines and switching equipment.

Prior Art - Fig. 1 is a block diagram illustrating a conventional trunk circuit control system, in which 1 is a trunk line, 2 is a 2-4 line conversion hybrid circuit, 3 is a DC signal control line for the trunk line, and 4 is a block diagram illustrating a conventional trunk circuit control system. 5 is a trunk circuit, 5 is a communication line, and 6 is a signal line for signal transmission (S
It consists of a S) line and a signal receiving (SR) line.

In addition, 7 is a POM multiplex conversion device (P CM-MUX),
8 is a signal drive circuit (SD), 9 is a trunk scanning circuit (T
10 is an information reception distribution circuit (SRD), and 11 is an SP bus interface circuit (SPINF). 1
2 is the SP bus, 13 is the highway to the digital exchange, 14 is the time division switch (TDSW), and 15 is the signaling equipment (SGE).

Next, the operation of the blocks in FIG. 1 will be explained.

In the case where the trunk 4 is an incoming trunk, when there is activation from the relay ls1, the communication line is extended to the PCM-MUX 7 via the hybrid circuit 2. On the other hand, the DC signal is separated from the speech signal in the hybrid circuit 2 and introduced into the trunk 4 via the control line 3. The trunk 4 converts this into an SS signal and sends it to the PCM-MUX 7. In PCM-MUX 7, this SS signal and communication line 5
The signals from the TDSW are PCM-multiplexed and sent to the TDSW 14 via the highway 13. Furthermore, the 5GE 15 separates the signals multiplexed on this highway and detects activation. Since the detailed operation in this respect is well known, the explanation will be omitted.

When the SGE 15 detects activation, the 9SR signal is driven by a processing device (not shown) to give the signal to the trunk SR line, contrary to the aforementioned SS line route. Then, the incoming trunk 4 detects this and returns a response to the preceding trunk line.

The above is an overview of the operation of the incoming trunk 4 in the blocks of FIG.

A circuit example of this human trunk 4 is shown in FIG. 2, in which 40 is a DC signal section, 41 is a control section thereof, S and T are pattern control relays driven by SDs, W,
$ is the scanning contact to TSCN9, whose windings are not shown. SR is a relay that receives the SR signal from PCM-MUX7, and the b contact, whose winding is not shown, is the PCM
-It sends the SS signal to MUX7.

In the explanation of the operation using blocks in Figure 1, only the activation and response operations were explained, but in a trunk with complicated operation, the S
It is not possible to control all ICT operations with information from only the S and SR lines, so pattern relays (S,
T) and scan points (w, z) are provided. The control of the pattern re-P- and scan points is controlled by the sp busses 2, 5 PINFII, 5 shown in FIG.
RD10° is made by SD8 and TSCN9.

In this way, trunks with simple operations can perform the operation by controlling only the SS and SR lines, but trunks with complex operations require pattern relays and scan points as well as 5PINF to control them. , S.R.D., S.
It has the disadvantage of requiring hardware such as D and TSCN. Also, the SS line.

Information is sent and received using the SR line, but it only performs extremely simple processing such as relaying dial pulses and meter pulses, and cannot perform advanced information processing.

OBJECTS OF THE INVENTION An object of the present invention is to provide a trunk circuit that uses a microcomputer to control trunk operations, thereby simplifying the hardware and enabling complex operations.

The trunk circuit according to the present invention has a microprocessor having an interface function with a DC signal section, and an SR line and an SS line are respectively connected to the input/output port of this microprocessor.

A relatively high-speed coded pulse train signal is used for information on the SS line, and a microprocessor scans and monitors the SR line to identify this signal and drive the DC signal section. The signal is configured to be sent to the SS line as a coded pulse train.

Furthermore, regarding dial pulse control, the microprocessor sends the dial pulse from the line to the SS line as a pulse train coded for each digit, and the dial pulse to the line is coded for each digit. It is configured to identify the encoded pulse train, convert it into a number of pulses, and send it to the line.

Example The present invention will be explained below using the drawings.

FIG. 3 is a block diagram for explaining the present invention in detail, and parts equivalent to those in FIG. 1 are designated by the same reference numerals. In the figure, 400 is a trunk circuit according to the present invention;
It contains a microprocessor, and various control operations are performed by this microprocessor. As a result, S D 8 , TSCN9 , 5R in FIG.
DIO, SP INFII, etc. are no longer necessary.

FIG. 4 is a diagram showing a trunk circuit 400 according to an embodiment of the present invention, in which 401 is a DC signal section and 402 is a microprocessor. Output of microprocessor 402)
A control lead is sent from (OUTP) to the DC signal section 401, and an input lead 405 is connected from the DC signal section 401 to the input port (INP) of the microprocessor 402. 403 is a signal level conversion circuit between the SS line, the SR line and the microprocessor 402;

The operation of the circuit shown in FIG. 4 will be explained assuming that it is an incoming trunk, but it can be similarly applied to an outgoing trunk.

When there is activation from the line, the DC signal section 401 detects this and inputs it to the microprocessor 402 via the lead 405. Therefore, the microprocessor 402 detects this activation and sends an activation signal to the SS line via the level conversion circuit 403. This activation signal is PCM-MUX7,,
It is transmitted to the TDSW 14 and 5GE 15 and detected by the processing unit of the exchange.

As a result, the trunk's S
When a signal is returned to the R line, the level friend exchange circuit 403
Level conversion is performed at , and the signal is input to microprocessor 402 . This microprocessor 402 has lead 4
04, the DC signal section 401 is driven, and an activation confirmation signal (response signal) is sent to the trunk line 1.

Next, if a dial pulse is sent from the trunk line,
As mentioned above, the state of the trunk line is input to the microprocessor 402, and the microprocessor 402 counts the dial pulses, and when it counts the dial pulses for the minus digit, it converts them into relatively high-speed signals of, for example, about 300 volts. Send to SS line.

An example of this pulse train is shown in FIG.
T is a start bit, S/G is a signal hit, and an example of a white bit signal length is shown.

SP is a stop bit and there is no signal (although it is activated)
shows. It is converted into the SIG bit shown in FIG. 5 according to the number of dial pulses from the trunk line. SS in Figure 3
If the signal bits shown in Figure 5 are used for transmitting or receiving signals on the line or SR line at a signal speed of 300 baud,
It takes <30m5 of time as shown in the formula below.

(1001000(/300)X (1(ST pit)
+6 (SIG Bibi)) +2 (SP Bibi)) 3Qm
This speed depends on the processing power of the trunk's microprocessor, the signal conversion speed of the PCM"-MUX, and the S
It is necessary that the signal conversion speed of GE is sufficiently compatible, and the higher the speed, the more information can be transmitted, but the processing power of the microprocessor needs to be comparable, and PCM-MUX and It goes without saying that SGE and the like must also perform high-speed processing. If the speed is low, the signal may not be transmitted, so this signal speed is set to the optimum speed based on the processing capacity and signal amount.

The signal pit length shown in FIG. 9 depends on the amount of information to be transmitted, and in the example shown in the figure, 2'=64 types of information can be obtained.

If the trunk 400 shown in FIG. 4 is an outgoing trunk, it is necessary to send a dial pulse to the line, but this
The microprocessor 402 receives it as a pulse train from the SR line from the M-MUX. This is sent out from the output capo (OUTP) and the lead 404 at a pulse speed of 10 PPS, and a dial pulse is sent from the DC signal section 401 to the trunk line.

When sending out a special signal, such as a recall signal, or inserting a special signal into a line, the microprocessor can identify this by sending the information as a relatively high-speed pulse train to the SR line. Since the direct current signal section is driven by the signal, it is possible to operate according to the signal. Since the data processing capacity of a microprocessor can be large, it is possible to process multiple lines with one microprocessor instead of installing each line in the trunk, which makes trunk circuits economical. The condition becomes even better.

Note that in order to send out serial pulses to the SS line or receive serial pulses from the SR line, a dedicated circuit (for example, a universal receiver, a transmitter circuit, etc.), the processing load on the microprocessor is reduced.

Effects of the Invention As described above, according to the present invention, since a microprocessor is used in the trunk, the amount of hardware required for trunk control is greatly reduced, and various controls become possible.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a conventional trunk control system, FIG. 2 is a diagram showing an example of a conventional trunk circuit, FIG. 3 is a system block diagram using the trunk circuit of the present invention, and FIG. 4 is a block diagram of the present invention. FIG. 5 is a block diagram of an embodiment of the trunk circuit of 1f! of the pulse train signal used in the present invention. FIG. Explanation of symbols of main parts 1... Trunk line 400... Trunk circuit 401...
・DC signal section 402...Microprocessor applicant NEC Corporation Representative Patent attorney Makoto Yanagawa

Claims (2)

[Claims] (1) A trunk circuit including a DC signal unit connected to a trunk line, a signal sending line, and a signal receiving line, the trunk circuit including a microprocessor having an interface function with the DC signal unit, and the microprocessor is configured to monitor the signal receiving line and drive the DC signal section according to the signal identification result of the signal receiving line, and the signal from the DC signal section is transmitted to the signal sending line. A trunk circuit configured to transmit to. (2) A trunk circuit including a DC signal unit connected to a trunk line, a signal sending line, and a signal receiving line, the trunk circuit including a microprocessor having an interface function with the DC signal unit, and the microprocessor is configured to monitor the signal receiving line and drive the DC signal section according to the signal identification result of the signal receiving line, and the signal from the DC signal section is transmitted to the signal sending line. The dial pulse information from the line is signal-processed and sent to the signal sending line, and the dial pulse information from the signal receiving line is signal-processed. A trunk circuit configured to transmit to a line.