JPH0217738A - Call correspondent synchronizing system - Google Patents

Abstract

PURPOSE:To perform the transfer of data after issuing a call in a short time in a system to perform feed corresponding to the call of communication by providing a frame pulse insertion means to insert a frame pulse with a prescribed cycle at the time of issuing the call from a subscriber in a station line termination device. CONSTITUTION:The frame pulse is inserted with the prescribed cycle at the frame insertion means 60 provided in the station line termination device at the time of issuing the call, and it is transferred to a subscriber side. Meanwhile, a prescribed power source is supplied to a frame detection circuit 90 at a switching means 145 provided in the feed circuit 140 of a customer data line termination device by the output control signal of the frame detection circuit 90 only for a period where the frame pulse is received from an input signal in the frame detection circuit 90. As a result, since it is possible to detect a frame bit immediately at the time of transferring the data after issuing the call in the customer data line termination device, the transfer of the data can be performed in a short time.

Description

[Detailed Description of the Invention] [Summary] The present invention relates to high-speed start-up of subscriber equipment using the Ca1l by Cal1 power supply system for communications, and aims to reduce the power consumption of the subscriber equipment while providing The purpose is to provide a synchronization method that allows data to be sent and received in a short period of time, and it is connected to an in-office line termination device installed in the exchange, etc., and an in-office line termination device installed on the subscriber side via the subscriber line. In a subscriber communication system equipped with a frame detection circuit for detecting frame pulses included in an input signal and a power supply circuit for supplying power to the frame detection circuit, an in-house data line termination device is provided. The device is provided with a frame pulse insertion means for inserting a frame pulse at a predetermined cycle when a subscriber makes a call, and the frame pulse is input to the power supply circuit of the in-home data line termination device by the frame detection circuit's output control signal. A switch means is provided to supply a predetermined power to the frame detection circuit by turning it on only during a period when a frame pulse is received from the signal,
The configuration is such that data can be sent and received in a short time after making a call.

[Industrial application field]

The present invention provides a system (Ca11) for supplying power for communication calls.
The present invention relates to high-speed start-up of subscriber equipment using a power supply system (by Ca1l power supply system).

At this time, there is a need for a synchronization system that can transmit and receive data in a short time after making a call while reducing the power consumption of subscriber equipment.

[Conventional technology]

FIG. 4 is a diagram showing the configuration of an example subscriber system.

FIG. 5 is a diagram explaining the operation of the conventional example.

As shown in FIG. 4, the in-office line termination bag W (hereinafter referred to as OCU) 1 in the exchange (hereinafter referred to as the office) and the in-house data line termination unit (hereinafter referred to as DSU) 2 on the subscriber side are connected to the subscriber line. In a subscriber system connected via
U2 outputs a pulse using the intermittent power supply method to confirm the call, and at the time of confirmation, the pulse indicating confirmation is sent to the station's O.
Send to CU 1. After that, data could be sent and received.

[Problem to be solved by the invention]

However, the above-mentioned system has a problem in that data transmission and reception are delayed for a certain period of time in order to re-establish frame synchronization after confirming the call origination.

Therefore, it is an object of the present invention to provide a synchronization system that can transmit and receive data in a short time after making a call, while reducing the power consumption of a DSU on the subscriber side.

[Means to solve the problem]

The above problem is solved by the method shown in FIG.

That is, in FIG. 1, there is an in-office line termination device 100 provided in the exchange, and an in-office line termination device 100 provided on the subscriber side and connected to the in-office line termination device via the subscriber line, which receives frame pulses contained in an input signal. In a subscriber communication system comprising an in-home data line termination device 200 having a frame detection circuit 90 for detecting frames and a power supply circuit 140 for supplying power to the frame detection circuit, a call from a subscriber is sent to the in-office line termination device. A frame pulse insertion means 60 is provided for inserting frame pulses at a predetermined period.

On the other hand, a switch is applied to the power supply circuit of the in-home data line termination device, which is turned on by the output control signal of the frame detection circuit only during the period when the frame detection circuit receives a frame pulse from the input signal, and supplies a predetermined power to the frame detection circuit. Means 145 is provided.

The system is configured so that data can be sent and received in a short time after making a call.

[For production]

In FIG. 1, a frame pulse inserting means 60 provided in the in-office line termination device inserts a frame pulse at a predetermined period when a subscriber makes a call and transfers it to the subscriber side.

On the other hand, in the switch means 145 provided in the power supply circuit 140 of the in-home data line termination device, the output control signal of the frame detection circuit is used to turn on the switch means 145 only during the period when the frame detection circuit receives a frame pulse from the input signal. Supply the specified power.

As a result, frame bits can be detected immediately when transmitting and receiving data after a call is made in the home data line terminal device, so that data can be transmitted and received in a short time.

〔Example〕

FIG. 2 is a circuit configuration block diagram of an embodiment of the present invention.

FIG. 3 is a diagram illustrating the operation of the embodiment.

The same reference numerals indicate the same objects throughout the figures.

In the present invention, as shown in FIG. 3, a frame pulse consisting of, for example, 10 bits is sent from the station side at a fixed period (for example, 100 ms) (while maintaining the allowable phase difference between the self-oscillator in the DSU and the station-side oscillator). time)). As shown in FIG. 2(a), an output pulse from a pulse generator 5 having a constant repetition period (for example, 100 m5) and duty (for example, 50%) is applied to one input terminal of an AND circuit 6.

On the other hand, for example, a signal of "1" is outputted from the counter 4 at the timing of the constant period of the frame pulse mentioned above, and the AN
It is added to the other input terminal of the D circuit 6.

As a result, a frame pulse is output at a period corresponding to the output of the counter 4, and in the case of optical communication, this output is transmitted by an electric/optical conversion element (hereinafter referred to as E10) 7 such as a laser diode (not shown). It is converted into an optical signal and sent to a subscriber line made of optical fiber.

On the other hand, in the subscriber side DStl 2, the optical signal input from the station side via the subscriber line is converted into an electrical signal by the light receiving element (hereinafter referred to as 0/E) 8 shown in Fig. 2(b). , is added to the frame synchronization circuit 9 and also added to the clock extraction section 11.

A clock extractor 11 extracts a clock from the input signal from the station, and adjusts the phase of a phase-locked loop circuit (hereinafter referred to as "circle") 12 as well as a PLI, 12 to the phase of the clock. The output of this circle 7L12 is added to a counter (hereinafter referred to as PC) 13 to generate a pulse for confirming the frame position. This performs frame synchronization by applying the above-mentioned output of 07E8 to the frame synchronization circuit 9, and corrects the output bit of PCl3 using the output.

Adding this output pulse of PCl3 to the power supply control circuit 14,
A field effect transistor (hereinafter referred to as FET, not shown) in the circuit 14 is turned on only when a frame pulse is input. Then, the switching output of the power supply control circuit 14 is applied to the 0/E 8 and the frame synchronization circuit 9, and power is supplied so as to be turned on only when a frame pulse is input.

As a result, as shown in FIG. 3, since frame pulses are constantly detected in the subscriber's terminal device 16, data can be sent and received immediately after confirming the calling signal.

Note that the PLL 12, PCl 3, and power supply control circuit 14 are always supplied with power.

〔Effect of the invention〕

As described above, according to the present invention, data can be sent and received in a short time after a call is made.

Furthermore, it is possible to reduce the power consumption of the subscriber device.

[Brief explanation of the drawing]

Fig. 1 is a diagram of the principle of the present invention, Fig. 2 is a block diagram of the circuit configuration of an embodiment of the invention, Fig. 3 is a diagram explaining the operation of the embodiment, and Fig. 4 shows the structure of an example subscriber system. The figure shown in FIG. 5 is a diagram explaining the operation of the conventional example. In the figure, 60 is a frame pulse insertion means, and 145 is a switch means. Diagram (Figure S) to explain the operation of L-type

Claims (1)

[Claims] An in-office line termination device (100) provided in an exchange;
A frame detection circuit (90) provided on the subscriber side and connected to the in-office line termination device via the subscriber line to detect a frame pulse included in an input signal, and a power supply circuit that supplies power to the frame detection circuit. In a subscriber communication system comprising an in-home data line termination device (200) having (140), a frame pulse is inserted into the in-office line termination device at a predetermined period when a subscriber makes a call. An insertion means (60) is provided in the power supply circuit of the in-home data line termination device, and is turned on by the output control signal of the frame detection circuit only during the period when the frame detection circuit receives a frame pulse from the input signal. A call handling synchronization system characterized in that a switch means (145) is provided to supply a predetermined power to a frame detection circuit, so that data can be sent and received in a short time after a call is made.